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</pre><div class="example-wrap"><pre class="rust ">
<span class="doccomment">//! Once a Map exists, the player can edit it in the UI (producing `MapEdits` in-memory), then save</span>
<span class="doccomment">//! the changes to a file (as `PermanentMapEdits`). See</span>
<span class="doccomment">//! &lt;https://a-b-street.github.io/docs/map/edits.html&gt;.</span>

<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::{<span class="ident">BTreeMap</span>, <span class="ident">BTreeSet</span>, <span class="ident">HashSet</span>};

<span class="kw">use</span> <span class="ident">anyhow</span>::<span class="prelude-ty">Result</span>;
<span class="kw">use</span> <span class="ident">serde</span>::{<span class="ident">Deserialize</span>, <span class="ident">Serialize</span>};

<span class="kw">use</span> <span class="ident">abstutil</span>::{<span class="ident">retain_btreemap</span>, <span class="ident">retain_btreeset</span>, <span class="ident">Timer</span>};
<span class="kw">use</span> <span class="ident">geom</span>::{<span class="ident">Distance</span>, <span class="ident">HashablePt2D</span>, <span class="ident">Line</span>, <span class="ident">Speed</span>, <span class="ident">Time</span>};

<span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">perma</span>::<span class="ident">PermanentMapEdits</span>;
<span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">make</span>::<span class="ident">initial</span>::<span class="ident">lane_specs</span>::<span class="ident">get_lane_specs_ltr</span>;
<span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">make</span>::{<span class="ident">match_points_to_lanes</span>, <span class="ident">snap_driveway</span>, <span class="ident">trim_path</span>};
<span class="kw">use</span> <span class="kw">crate</span>::{
    <span class="ident">connectivity</span>, <span class="ident">AccessRestrictions</span>, <span class="ident">BuildingID</span>, <span class="ident">BusRouteID</span>, <span class="ident">ControlStopSign</span>,
    <span class="ident">ControlTrafficSignal</span>, <span class="ident">IntersectionID</span>, <span class="ident">IntersectionType</span>, <span class="ident">LaneID</span>, <span class="ident">LaneSpec</span>, <span class="ident">Map</span>, <span class="ident">MapConfig</span>,
    <span class="ident">ParkingLotID</span>, <span class="ident">PathConstraints</span>, <span class="ident">Pathfinder</span>, <span class="ident">Road</span>, <span class="ident">RoadID</span>, <span class="ident">TurnID</span>, <span class="ident">Zone</span>,
};

<span class="kw">mod</span> <span class="ident">compat</span>;
<span class="kw">mod</span> <span class="ident">perma</span>;

<span class="doccomment">/// Represents changes to a map. Note this isn&#39;t serializable -- that&#39;s what `PermanentMapEdits`</span>
<span class="doccomment">/// does.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>, <span class="ident">PartialEq</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">MapEdits</span> {
    <span class="kw">pub</span> <span class="ident">edits_name</span>: <span class="ident">String</span>,
    <span class="doccomment">/// A stack, oldest edit is first. The same intersection may be edited multiple times in this</span>
    <span class="doccomment">/// stack, until compress() happens.</span>
    <span class="kw">pub</span> <span class="ident">commands</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">EditCmd</span><span class="op">&gt;</span>,
    <span class="doccomment">/// If false, adjacent roads with the same AccessRestrictions will not be merged into the same</span>
    <span class="doccomment">/// Zone; every Road will be its own Zone. This is used to experiment with a per-road cap. Note</span>
    <span class="doccomment">/// this is a map-wide setting.</span>
    <span class="kw">pub</span> <span class="ident">merge_zones</span>: <span class="ident">bool</span>,

    <span class="doccomment">/// Derived from commands, kept up to date by update_derived</span>
    <span class="kw">pub</span> <span class="ident">changed_roads</span>: <span class="ident">BTreeSet</span><span class="op">&lt;</span><span class="ident">RoadID</span><span class="op">&gt;</span>,
    <span class="kw">pub</span> <span class="ident">original_intersections</span>: <span class="ident">BTreeMap</span><span class="op">&lt;</span><span class="ident">IntersectionID</span>, <span class="ident">EditIntersection</span><span class="op">&gt;</span>,
    <span class="kw">pub</span> <span class="ident">changed_routes</span>: <span class="ident">BTreeSet</span><span class="op">&lt;</span><span class="ident">BusRouteID</span><span class="op">&gt;</span>,

    <span class="doccomment">/// Some edits are included in the game by default, in data/system/proposals, as &quot;community</span>
    <span class="doccomment">/// proposals.&quot; They require a description and may have a link to a write-up.</span>
    <span class="kw">pub</span> <span class="ident">proposal_description</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>,
    <span class="kw">pub</span> <span class="ident">proposal_link</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>,
}

<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>, <span class="ident">PartialEq</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">EditIntersection</span> {
    <span class="ident">StopSign</span>(<span class="ident">ControlStopSign</span>),
    <span class="comment">// Don&#39;t keep ControlTrafficSignal here, because it contains movements that should be</span>
    <span class="comment">// generated after all lane edits are applied.</span>
    <span class="ident">TrafficSignal</span>(<span class="ident">traffic_signal_data</span>::<span class="ident">TrafficSignal</span>),
    <span class="ident">Closed</span>,
}

<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>, <span class="ident">PartialEq</span>, <span class="ident">Serialize</span>, <span class="ident">Deserialize</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">EditRoad</span> {
    <span class="kw">pub</span> <span class="ident">lanes_ltr</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">LaneSpec</span><span class="op">&gt;</span>,
    <span class="kw">pub</span> <span class="ident">speed_limit</span>: <span class="ident">Speed</span>,
    <span class="kw">pub</span> <span class="ident">access_restrictions</span>: <span class="ident">AccessRestrictions</span>,
}

<span class="kw">impl</span> <span class="ident">EditRoad</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_orig_from_osm</span>(<span class="ident">r</span>: <span class="kw-2">&amp;</span><span class="ident">Road</span>, <span class="ident">cfg</span>: <span class="kw-2">&amp;</span><span class="ident">MapConfig</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">EditRoad</span> {
        <span class="ident">EditRoad</span> {
            <span class="ident">lanes_ltr</span>: <span class="ident">get_lane_specs_ltr</span>(<span class="kw-2">&amp;</span><span class="ident">r</span>.<span class="ident">osm_tags</span>, <span class="ident">cfg</span>),
            <span class="ident">speed_limit</span>: <span class="ident">r</span>.<span class="ident">speed_limit_from_osm</span>(),
            <span class="ident">access_restrictions</span>: <span class="ident">r</span>.<span class="ident">access_restrictions_from_osm</span>(),
        }
    }

    <span class="kw">fn</span> <span class="ident">diff</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&amp;</span><span class="ident">EditRoad</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lt</span> <span class="op">=</span> <span class="number">0</span>;
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">dir</span> <span class="op">=</span> <span class="number">0</span>;
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">width</span> <span class="op">=</span> <span class="number">0</span>;
        <span class="kw">for</span> (<span class="ident">spec1</span>, <span class="ident">spec2</span>) <span class="kw">in</span> <span class="self">self</span>.<span class="ident">lanes_ltr</span>.<span class="ident">iter</span>().<span class="ident">zip</span>(<span class="ident">other</span>.<span class="ident">lanes_ltr</span>.<span class="ident">iter</span>()) {
            <span class="kw">if</span> <span class="ident">spec1</span>.<span class="ident">lt</span> <span class="op">!</span><span class="op">=</span> <span class="ident">spec2</span>.<span class="ident">lt</span> {
                <span class="ident">lt</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
            }
            <span class="kw">if</span> <span class="ident">spec1</span>.<span class="ident">dir</span> <span class="op">!</span><span class="op">=</span> <span class="ident">spec2</span>.<span class="ident">dir</span> {
                <span class="ident">dir</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
            }
            <span class="kw">if</span> <span class="ident">spec1</span>.<span class="ident">width</span> <span class="op">!</span><span class="op">=</span> <span class="ident">spec2</span>.<span class="ident">width</span> {
                <span class="ident">width</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
            }
        }

        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">changes</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
        <span class="kw">if</span> <span class="ident">lt</span> <span class="op">=</span><span class="op">=</span> <span class="number">1</span> {
            <span class="ident">changes</span>.<span class="ident">push</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;1 lane type&quot;</span>));
        } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">lt</span> <span class="op">&gt;</span> <span class="number">1</span> {
            <span class="ident">changes</span>.<span class="ident">push</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{} lane types&quot;</span>, <span class="ident">lt</span>));
        }
        <span class="kw">if</span> <span class="ident">dir</span> <span class="op">=</span><span class="op">=</span> <span class="number">1</span> {
            <span class="ident">changes</span>.<span class="ident">push</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;1 lane reversal&quot;</span>));
        } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">dir</span> <span class="op">&gt;</span> <span class="number">1</span> {
            <span class="ident">changes</span>.<span class="ident">push</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{} lane reversals&quot;</span>, <span class="ident">dir</span>));
        }
        <span class="kw">if</span> <span class="ident">width</span> <span class="op">=</span><span class="op">=</span> <span class="number">1</span> {
            <span class="ident">changes</span>.<span class="ident">push</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;1 lane width&quot;</span>));
        } <span class="kw">else</span> {
            <span class="ident">changes</span>.<span class="ident">push</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{} lane widths&quot;</span>, <span class="ident">width</span>));
        }
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">speed_limit</span> <span class="op">!</span><span class="op">=</span> <span class="ident">other</span>.<span class="ident">speed_limit</span> {
            <span class="ident">changes</span>.<span class="ident">push</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;speed limit&quot;</span>));
        }
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">access_restrictions</span> <span class="op">!</span><span class="op">=</span> <span class="ident">other</span>.<span class="ident">access_restrictions</span> {
            <span class="ident">changes</span>.<span class="ident">push</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;access restrictions&quot;</span>));
        }
        <span class="ident">changes</span>
    }
}

<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>, <span class="ident">PartialEq</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">EditCmd</span> {
    <span class="ident">ChangeRoad</span> {
        <span class="ident">r</span>: <span class="ident">RoadID</span>,
        <span class="ident">old</span>: <span class="ident">EditRoad</span>,
        <span class="ident">new</span>: <span class="ident">EditRoad</span>,
    },
    <span class="ident">ChangeIntersection</span> {
        <span class="ident">i</span>: <span class="ident">IntersectionID</span>,
        <span class="ident">new</span>: <span class="ident">EditIntersection</span>,
        <span class="ident">old</span>: <span class="ident">EditIntersection</span>,
    },
    <span class="ident">ChangeRouteSchedule</span> {
        <span class="ident">id</span>: <span class="ident">BusRouteID</span>,
        <span class="ident">old</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Time</span><span class="op">&gt;</span>,
        <span class="ident">new</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Time</span><span class="op">&gt;</span>,
    },
}

<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">EditEffects</span> {
    <span class="kw">pub</span> <span class="ident">changed_roads</span>: <span class="ident">BTreeSet</span><span class="op">&lt;</span><span class="ident">RoadID</span><span class="op">&gt;</span>,
    <span class="kw">pub</span> <span class="ident">deleted_lanes</span>: <span class="ident">BTreeSet</span><span class="op">&lt;</span><span class="ident">LaneID</span><span class="op">&gt;</span>,
    <span class="kw">pub</span> <span class="ident">changed_intersections</span>: <span class="ident">BTreeSet</span><span class="op">&lt;</span><span class="ident">IntersectionID</span><span class="op">&gt;</span>,
    <span class="kw">pub</span> <span class="ident">added_turns</span>: <span class="ident">BTreeSet</span><span class="op">&lt;</span><span class="ident">TurnID</span><span class="op">&gt;</span>,
    <span class="kw">pub</span> <span class="ident">deleted_turns</span>: <span class="ident">BTreeSet</span><span class="op">&lt;</span><span class="ident">TurnID</span><span class="op">&gt;</span>,
    <span class="kw">pub</span> <span class="ident">resnapped_buildings</span>: <span class="ident">bool</span>,
    <span class="kw">pub</span> <span class="ident">changed_parking_lots</span>: <span class="ident">BTreeSet</span><span class="op">&lt;</span><span class="ident">ParkingLotID</span><span class="op">&gt;</span>,
}

<span class="kw">impl</span> <span class="ident">MapEdits</span> {
    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-</span><span class="op">&gt;</span> <span class="ident">MapEdits</span> {
        <span class="ident">MapEdits</span> {
            <span class="ident">edits_name</span>: <span class="string">&quot;TODO temporary&quot;</span>.<span class="ident">to_string</span>(),
            <span class="ident">proposal_description</span>: <span class="ident">Vec</span>::<span class="ident">new</span>(),
            <span class="ident">proposal_link</span>: <span class="prelude-val">None</span>,
            <span class="ident">commands</span>: <span class="ident">Vec</span>::<span class="ident">new</span>(),
            <span class="ident">merge_zones</span>: <span class="bool-val">true</span>,

            <span class="ident">changed_roads</span>: <span class="ident">BTreeSet</span>::<span class="ident">new</span>(),
            <span class="ident">original_intersections</span>: <span class="ident">BTreeMap</span>::<span class="ident">new</span>(),
            <span class="ident">changed_routes</span>: <span class="ident">BTreeSet</span>::<span class="ident">new</span>(),
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">load</span>(<span class="ident">map</span>: <span class="kw-2">&amp;</span><span class="ident">Map</span>, <span class="ident">path</span>: <span class="ident">String</span>, <span class="ident">timer</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Timer</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">MapEdits</span><span class="op">&gt;</span> {
        <span class="kw">match</span> <span class="ident">abstio</span>::<span class="ident">maybe_read_json</span>::<span class="op">&lt;</span><span class="ident">PermanentMapEdits</span><span class="op">&gt;</span>(<span class="ident">path</span>.<span class="ident">clone</span>(), <span class="ident">timer</span>) {
            <span class="prelude-val">Ok</span>(<span class="ident">perma</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="ident">perma</span>.<span class="ident">to_edits</span>(<span class="ident">map</span>),
            <span class="prelude-val">Err</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">&gt;</span> {
                <span class="comment">// The JSON format may have changed, so attempt backwards compatibility.</span>
                <span class="kw">let</span> <span class="ident">bytes</span> <span class="op">=</span> <span class="ident">abstio</span>::<span class="ident">slurp_file</span>(<span class="ident">path</span>)<span class="question-mark">?</span>;
                <span class="kw">let</span> <span class="ident">contents</span> <span class="op">=</span> <span class="ident">std</span>::<span class="ident">str</span>::<span class="ident">from_utf8</span>(<span class="kw-2">&amp;</span><span class="ident">bytes</span>)<span class="question-mark">?</span>;
                <span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="ident">serde_json</span>::<span class="ident">from_str</span>(<span class="ident">contents</span>)<span class="question-mark">?</span>;
                <span class="kw">let</span> <span class="ident">perma</span> <span class="op">=</span> <span class="ident">compat</span>::<span class="ident">upgrade</span>(<span class="ident">value</span>, <span class="ident">map</span>)<span class="question-mark">?</span>;
                <span class="ident">perma</span>.<span class="ident">to_edits</span>(<span class="ident">map</span>)
            }
        }
    }

    <span class="kw">fn</span> <span class="ident">save</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">map</span>: <span class="kw-2">&amp;</span><span class="ident">Map</span>) {
        <span class="comment">// If untitled and empty, don&#39;t actually save anything.</span>
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">edits_name</span>.<span class="ident">starts_with</span>(<span class="string">&quot;Untitled Proposal&quot;</span>) <span class="op">&amp;&amp;</span> <span class="self">self</span>.<span class="ident">commands</span>.<span class="ident">is_empty</span>() {
            <span class="kw">return</span>;
        }

        <span class="ident">abstio</span>::<span class="ident">write_json</span>(
            <span class="ident">abstio</span>::<span class="ident">path_edits</span>(<span class="ident">map</span>.<span class="ident">get_name</span>(), <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">edits_name</span>),
            <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">to_permanent</span>(<span class="ident">map</span>),
        );
    }

    <span class="kw">fn</span> <span class="ident">update_derived</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">map</span>: <span class="kw-2">&amp;</span><span class="ident">Map</span>) {
        <span class="self">self</span>.<span class="ident">changed_roads</span>.<span class="ident">clear</span>();
        <span class="self">self</span>.<span class="ident">original_intersections</span>.<span class="ident">clear</span>();
        <span class="self">self</span>.<span class="ident">changed_routes</span>.<span class="ident">clear</span>();

        <span class="kw">for</span> <span class="ident">cmd</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">commands</span> {
            <span class="kw">match</span> <span class="ident">cmd</span> {
                <span class="ident">EditCmd</span>::<span class="ident">ChangeRoad</span> { <span class="ident">r</span>, .. } <span class="op">=</span><span class="op">&gt;</span> {
                    <span class="self">self</span>.<span class="ident">changed_roads</span>.<span class="ident">insert</span>(<span class="kw-2">*</span><span class="ident">r</span>);
                }
                <span class="ident">EditCmd</span>::<span class="ident">ChangeIntersection</span> { <span class="ident">i</span>, <span class="kw-2">ref</span> <span class="ident">old</span>, .. } <span class="op">=</span><span class="op">&gt;</span> {
                    <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">original_intersections</span>.<span class="ident">contains_key</span>(<span class="ident">i</span>) {
                        <span class="self">self</span>.<span class="ident">original_intersections</span>.<span class="ident">insert</span>(<span class="kw-2">*</span><span class="ident">i</span>, <span class="ident">old</span>.<span class="ident">clone</span>());
                    }
                }
                <span class="ident">EditCmd</span>::<span class="ident">ChangeRouteSchedule</span> { <span class="ident">id</span>, .. } <span class="op">=</span><span class="op">&gt;</span> {
                    <span class="self">self</span>.<span class="ident">changed_routes</span>.<span class="ident">insert</span>(<span class="kw-2">*</span><span class="ident">id</span>);
                }
            }
        }

        <span class="ident">retain_btreeset</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">changed_roads</span>, <span class="op">|</span><span class="ident">r</span><span class="op">|</span> {
            <span class="ident">map</span>.<span class="ident">get_r_edit</span>(<span class="kw-2">*</span><span class="ident">r</span>) <span class="op">!</span><span class="op">=</span> <span class="ident">EditRoad</span>::<span class="ident">get_orig_from_osm</span>(<span class="ident">map</span>.<span class="ident">get_r</span>(<span class="kw-2">*</span><span class="ident">r</span>), <span class="kw-2">&amp;</span><span class="ident">map</span>.<span class="ident">config</span>)
        });
        <span class="ident">retain_btreemap</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">original_intersections</span>, <span class="op">|</span><span class="ident">i</span>, <span class="ident">orig</span><span class="op">|</span> {
            <span class="ident">map</span>.<span class="ident">get_i_edit</span>(<span class="kw-2">*</span><span class="ident">i</span>) <span class="op">!</span><span class="op">=</span> <span class="ident">orig</span>.<span class="ident">clone</span>()
        });
        <span class="ident">retain_btreeset</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">changed_routes</span>, <span class="op">|</span><span class="ident">br</span><span class="op">|</span> {
            <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">map</span>.<span class="ident">get_br</span>(<span class="kw-2">*</span><span class="ident">br</span>);
            <span class="ident">r</span>.<span class="ident">spawn_times</span> <span class="op">!</span><span class="op">=</span> <span class="ident">r</span>.<span class="ident">orig_spawn_times</span>
        });
    }

    <span class="doccomment">/// Assumes update_derived has been called.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">compress</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">map</span>: <span class="kw-2">&amp;</span><span class="ident">Map</span>) {
        <span class="kw">for</span> <span class="ident">r</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">changed_roads</span> {
            <span class="self">self</span>.<span class="ident">commands</span>.<span class="ident">push</span>(<span class="ident">EditCmd</span>::<span class="ident">ChangeRoad</span> {
                <span class="ident">r</span>: <span class="kw-2">*</span><span class="ident">r</span>,
                <span class="ident">old</span>: <span class="ident">EditRoad</span>::<span class="ident">get_orig_from_osm</span>(<span class="ident">map</span>.<span class="ident">get_r</span>(<span class="kw-2">*</span><span class="ident">r</span>), <span class="kw-2">&amp;</span><span class="ident">map</span>.<span class="ident">config</span>),
                <span class="ident">new</span>: <span class="ident">map</span>.<span class="ident">get_r_edit</span>(<span class="kw-2">*</span><span class="ident">r</span>),
            });
        }
        <span class="kw">for</span> (<span class="ident">i</span>, <span class="ident">old</span>) <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">original_intersections</span> {
            <span class="self">self</span>.<span class="ident">commands</span>.<span class="ident">push</span>(<span class="ident">EditCmd</span>::<span class="ident">ChangeIntersection</span> {
                <span class="ident">i</span>: <span class="kw-2">*</span><span class="ident">i</span>,
                <span class="ident">old</span>: <span class="ident">old</span>.<span class="ident">clone</span>(),
                <span class="ident">new</span>: <span class="ident">map</span>.<span class="ident">get_i_edit</span>(<span class="kw-2">*</span><span class="ident">i</span>),
            });
        }
        <span class="kw">for</span> <span class="ident">r</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">changed_routes</span> {
            <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">map</span>.<span class="ident">get_br</span>(<span class="kw-2">*</span><span class="ident">r</span>);
            <span class="self">self</span>.<span class="ident">commands</span>.<span class="ident">push</span>(<span class="ident">EditCmd</span>::<span class="ident">ChangeRouteSchedule</span> {
                <span class="ident">id</span>: <span class="ident">r</span>.<span class="ident">id</span>,
                <span class="ident">new</span>: <span class="ident">r</span>.<span class="ident">spawn_times</span>.<span class="ident">clone</span>(),
                <span class="ident">old</span>: <span class="ident">r</span>.<span class="ident">orig_spawn_times</span>.<span class="ident">clone</span>(),
            });
        }
    }

    <span class="doccomment">/// Pick apart changed_roads and figure out if an entire road was edited, or just a few lanes.</span>
    <span class="doccomment">/// Doesn&#39;t return deleted lanes.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">changed_lanes</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">map</span>: <span class="kw-2">&amp;</span><span class="ident">Map</span>) <span class="op">-</span><span class="op">&gt;</span> (<span class="ident">BTreeSet</span><span class="op">&lt;</span><span class="ident">LaneID</span><span class="op">&gt;</span>, <span class="ident">BTreeSet</span><span class="op">&lt;</span><span class="ident">RoadID</span><span class="op">&gt;</span>) {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lanes</span> <span class="op">=</span> <span class="ident">BTreeSet</span>::<span class="ident">new</span>();
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">roads</span> <span class="op">=</span> <span class="ident">BTreeSet</span>::<span class="ident">new</span>();
        <span class="kw">for</span> <span class="ident">r</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">changed_roads</span> {
            <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">map</span>.<span class="ident">get_r</span>(<span class="kw-2">*</span><span class="ident">r</span>);
            <span class="kw">let</span> <span class="ident">orig</span> <span class="op">=</span> <span class="ident">EditRoad</span>::<span class="ident">get_orig_from_osm</span>(<span class="ident">r</span>, <span class="ident">map</span>.<span class="ident">get_config</span>());
            <span class="comment">// What exactly changed?</span>
            <span class="kw">if</span> <span class="ident">r</span>.<span class="ident">speed_limit</span> <span class="op">!</span><span class="op">=</span> <span class="ident">orig</span>.<span class="ident">speed_limit</span>
                <span class="op">|</span><span class="op">|</span> <span class="ident">r</span>.<span class="ident">access_restrictions</span> <span class="op">!</span><span class="op">=</span> <span class="ident">orig</span>.<span class="ident">access_restrictions</span>
            {
                <span class="ident">roads</span>.<span class="ident">insert</span>(<span class="ident">r</span>.<span class="ident">id</span>);
            } <span class="kw">else</span> {
                <span class="kw">let</span> <span class="ident">lanes_ltr</span> <span class="op">=</span> <span class="ident">r</span>.<span class="ident">lanes_ltr</span>();
                <span class="kw">if</span> <span class="ident">lanes_ltr</span>.<span class="ident">len</span>() <span class="op">!</span><span class="op">=</span> <span class="ident">orig</span>.<span class="ident">lanes_ltr</span>.<span class="ident">len</span>() {
                    <span class="comment">// If a lane was added or deleted, figuring out if any were modified is kind of</span>
                    <span class="comment">// unclear -- just mark the entire road.</span>
                    <span class="ident">roads</span>.<span class="ident">insert</span>(<span class="ident">r</span>.<span class="ident">id</span>);
                } <span class="kw">else</span> {
                    <span class="kw">for</span> ((<span class="ident">l</span>, <span class="ident">dir</span>, <span class="ident">lt</span>), <span class="ident">spec</span>) <span class="kw">in</span> <span class="ident">lanes_ltr</span>.<span class="ident">into_iter</span>().<span class="ident">zip</span>(<span class="ident">orig</span>.<span class="ident">lanes_ltr</span>.<span class="ident">iter</span>()) {
                        <span class="kw">if</span> <span class="ident">dir</span> <span class="op">!</span><span class="op">=</span> <span class="ident">spec</span>.<span class="ident">dir</span> <span class="op">|</span><span class="op">|</span> <span class="ident">lt</span> <span class="op">!</span><span class="op">=</span> <span class="ident">spec</span>.<span class="ident">lt</span> <span class="op">|</span><span class="op">|</span> <span class="ident">map</span>.<span class="ident">get_l</span>(<span class="ident">l</span>).<span class="ident">width</span> <span class="op">!</span><span class="op">=</span> <span class="ident">spec</span>.<span class="ident">width</span> {
                            <span class="ident">lanes</span>.<span class="ident">insert</span>(<span class="ident">l</span>);
                        }
                    }
                }
            }
        }
        (<span class="ident">lanes</span>, <span class="ident">roads</span>)
    }
}

<span class="kw">impl</span> <span class="ident">std</span>::<span class="ident">default</span>::<span class="ident">Default</span> <span class="kw">for</span> <span class="ident">MapEdits</span> {
    <span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-</span><span class="op">&gt;</span> <span class="ident">MapEdits</span> {
        <span class="ident">MapEdits</span>::<span class="ident">new</span>()
    }
}

<span class="kw">impl</span> <span class="ident">EditCmd</span> {
    <span class="doccomment">/// (summary, details)</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">describe</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">map</span>: <span class="kw-2">&amp;</span><span class="ident">Map</span>) <span class="op">-</span><span class="op">&gt;</span> (<span class="ident">String</span>, <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>) {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">details</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
        <span class="kw">let</span> <span class="ident">summary</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span> {
            <span class="ident">EditCmd</span>::<span class="ident">ChangeRoad</span> { <span class="ident">r</span>, <span class="ident">old</span>, <span class="ident">new</span> } <span class="op">=</span><span class="op">&gt;</span> {
                <span class="ident">details</span> <span class="op">=</span> <span class="ident">new</span>.<span class="ident">diff</span>(<span class="ident">old</span>);
                <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;road #{}&quot;</span>, <span class="ident">r</span>.<span class="number">0</span>)
            }
            <span class="comment">// TODO Describe changes</span>
            <span class="ident">EditCmd</span>::<span class="ident">ChangeIntersection</span> { <span class="ident">i</span>, <span class="ident">new</span>, .. } <span class="op">=</span><span class="op">&gt;</span> <span class="kw">match</span> <span class="ident">new</span> {
                <span class="ident">EditIntersection</span>::<span class="ident">StopSign</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;stop sign #{}&quot;</span>, <span class="ident">i</span>.<span class="number">0</span>),
                <span class="ident">EditIntersection</span>::<span class="ident">TrafficSignal</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;traffic signal #{}&quot;</span>, <span class="ident">i</span>.<span class="number">0</span>),
                <span class="ident">EditIntersection</span>::<span class="ident">Closed</span> <span class="op">=</span><span class="op">&gt;</span> <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;close {}&quot;</span>, <span class="ident">i</span>),
            },
            <span class="ident">EditCmd</span>::<span class="ident">ChangeRouteSchedule</span> { <span class="ident">id</span>, .. } <span class="op">=</span><span class="op">&gt;</span> {
                <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;reschedule route {}&quot;</span>, <span class="ident">map</span>.<span class="ident">get_br</span>(<span class="kw-2">*</span><span class="ident">id</span>).<span class="ident">short_name</span>)
            }
        };
        (<span class="ident">summary</span>, <span class="ident">details</span>)
    }

    <span class="comment">// Must be idempotent</span>
    <span class="kw">fn</span> <span class="ident">apply</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">effects</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">EditEffects</span>, <span class="ident">map</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Map</span>) {
        <span class="kw">match</span> <span class="self">self</span> {
            <span class="ident">EditCmd</span>::<span class="ident">ChangeRoad</span> { <span class="ident">r</span>, <span class="kw-2">ref</span> <span class="ident">new</span>, .. } <span class="op">=</span><span class="op">&gt;</span> {
                <span class="kw">if</span> <span class="ident">map</span>.<span class="ident">get_r_edit</span>(<span class="kw-2">*</span><span class="ident">r</span>) <span class="op">=</span><span class="op">=</span> <span class="ident">new</span>.<span class="ident">clone</span>() {
                    <span class="kw">return</span>;
                }

                <span class="ident">modify_lanes</span>(<span class="ident">map</span>, <span class="kw-2">*</span><span class="ident">r</span>, <span class="ident">new</span>.<span class="ident">lanes_ltr</span>.<span class="ident">clone</span>(), <span class="ident">effects</span>);
                <span class="kw">let</span> <span class="ident">road</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">map</span>.<span class="ident">roads</span>[<span class="ident">r</span>.<span class="number">0</span>];
                <span class="ident">road</span>.<span class="ident">speed_limit</span> <span class="op">=</span> <span class="ident">new</span>.<span class="ident">speed_limit</span>;
                <span class="ident">road</span>.<span class="ident">access_restrictions</span> <span class="op">=</span> <span class="ident">new</span>.<span class="ident">access_restrictions</span>.<span class="ident">clone</span>();

                <span class="ident">effects</span>.<span class="ident">changed_roads</span>.<span class="ident">insert</span>(<span class="ident">road</span>.<span class="ident">id</span>);
                <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">road</span>.<span class="ident">src_i</span>, <span class="ident">road</span>.<span class="ident">dst_i</span>] {
                    <span class="ident">effects</span>.<span class="ident">changed_intersections</span>.<span class="ident">insert</span>(<span class="ident">i</span>);
                    <span class="kw">let</span> <span class="ident">i</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">map</span>.<span class="ident">intersections</span>[<span class="ident">i</span>.<span class="number">0</span>];
                    <span class="ident">i</span>.<span class="ident">outgoing_lanes</span>.<span class="ident">clear</span>();
                    <span class="ident">i</span>.<span class="ident">incoming_lanes</span>.<span class="ident">clear</span>();
                    <span class="kw">for</span> <span class="ident">r</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="ident">i</span>.<span class="ident">roads</span> {
                        <span class="kw">for</span> (<span class="ident">l</span>, <span class="kw">_</span>, <span class="kw">_</span>) <span class="kw">in</span> <span class="ident">map</span>.<span class="ident">roads</span>[<span class="ident">r</span>.<span class="number">0</span>].<span class="ident">lanes_ltr</span>() {
                            <span class="kw">if</span> <span class="ident">map</span>.<span class="ident">lanes</span>[<span class="kw-2">&amp;</span><span class="ident">l</span>].<span class="ident">src_i</span> <span class="op">=</span><span class="op">=</span> <span class="ident">i</span>.<span class="ident">id</span> {
                                <span class="ident">i</span>.<span class="ident">outgoing_lanes</span>.<span class="ident">push</span>(<span class="ident">l</span>);
                            } <span class="kw">else</span> {
                                <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">map</span>.<span class="ident">lanes</span>[<span class="kw-2">&amp;</span><span class="ident">l</span>].<span class="ident">dst_i</span>, <span class="ident">i</span>.<span class="ident">id</span>);
                                <span class="ident">i</span>.<span class="ident">incoming_lanes</span>.<span class="ident">push</span>(<span class="ident">l</span>);
                            }
                        }
                    }

                    <span class="ident">recalculate_turns</span>(<span class="ident">i</span>.<span class="ident">id</span>, <span class="ident">map</span>, <span class="ident">effects</span>);
                }
            }
            <span class="ident">EditCmd</span>::<span class="ident">ChangeIntersection</span> {
                <span class="ident">i</span>,
                <span class="kw-2">ref</span> <span class="ident">new</span>,
                <span class="kw-2">ref</span> <span class="ident">old</span>,
            } <span class="op">=</span><span class="op">&gt;</span> {
                <span class="kw">if</span> <span class="ident">map</span>.<span class="ident">get_i_edit</span>(<span class="kw-2">*</span><span class="ident">i</span>) <span class="op">=</span><span class="op">=</span> <span class="ident">new</span>.<span class="ident">clone</span>() {
                    <span class="kw">return</span>;
                }

                <span class="ident">map</span>.<span class="ident">stop_signs</span>.<span class="ident">remove</span>(<span class="ident">i</span>);
                <span class="ident">map</span>.<span class="ident">traffic_signals</span>.<span class="ident">remove</span>(<span class="ident">i</span>);
                <span class="ident">effects</span>.<span class="ident">changed_intersections</span>.<span class="ident">insert</span>(<span class="kw-2">*</span><span class="ident">i</span>);
                <span class="kw">match</span> <span class="ident">new</span> {
                    <span class="ident">EditIntersection</span>::<span class="ident">StopSign</span>(<span class="kw-2">ref</span> <span class="ident">ss</span>) <span class="op">=</span><span class="op">&gt;</span> {
                        <span class="ident">map</span>.<span class="ident">intersections</span>[<span class="ident">i</span>.<span class="number">0</span>].<span class="ident">intersection_type</span> <span class="op">=</span> <span class="ident">IntersectionType</span>::<span class="ident">StopSign</span>;
                        <span class="ident">map</span>.<span class="ident">stop_signs</span>.<span class="ident">insert</span>(<span class="kw-2">*</span><span class="ident">i</span>, <span class="ident">ss</span>.<span class="ident">clone</span>());
                    }
                    <span class="ident">EditIntersection</span>::<span class="ident">TrafficSignal</span>(<span class="kw-2">ref</span> <span class="ident">raw_ts</span>) <span class="op">=</span><span class="op">&gt;</span> {
                        <span class="ident">map</span>.<span class="ident">intersections</span>[<span class="ident">i</span>.<span class="number">0</span>].<span class="ident">intersection_type</span> <span class="op">=</span> <span class="ident">IntersectionType</span>::<span class="ident">TrafficSignal</span>;
                        <span class="kw">if</span> <span class="ident">old</span> <span class="op">=</span><span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">EditIntersection</span>::<span class="ident">Closed</span> {
                            <span class="ident">recalculate_turns</span>(<span class="kw-2">*</span><span class="ident">i</span>, <span class="ident">map</span>, <span class="ident">effects</span>);
                        }
                        <span class="ident">map</span>.<span class="ident">traffic_signals</span>.<span class="ident">insert</span>(
                            <span class="kw-2">*</span><span class="ident">i</span>,
                            <span class="ident">ControlTrafficSignal</span>::<span class="ident">import</span>(<span class="ident">raw_ts</span>.<span class="ident">clone</span>(), <span class="kw-2">*</span><span class="ident">i</span>, <span class="ident">map</span>).<span class="ident">unwrap</span>(),
                        );
                    }
                    <span class="ident">EditIntersection</span>::<span class="ident">Closed</span> <span class="op">=</span><span class="op">&gt;</span> {
                        <span class="ident">map</span>.<span class="ident">intersections</span>[<span class="ident">i</span>.<span class="number">0</span>].<span class="ident">intersection_type</span> <span class="op">=</span> <span class="ident">IntersectionType</span>::<span class="ident">Construction</span>;
                    }
                }

                <span class="kw">if</span> <span class="ident">old</span> <span class="op">=</span><span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">EditIntersection</span>::<span class="ident">Closed</span> <span class="op">|</span><span class="op">|</span> <span class="ident">new</span> <span class="op">=</span><span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">EditIntersection</span>::<span class="ident">Closed</span> {
                    <span class="ident">recalculate_turns</span>(<span class="kw-2">*</span><span class="ident">i</span>, <span class="ident">map</span>, <span class="ident">effects</span>);
                }
            }
            <span class="ident">EditCmd</span>::<span class="ident">ChangeRouteSchedule</span> { <span class="ident">id</span>, <span class="ident">new</span>, .. } <span class="op">=</span><span class="op">&gt;</span> {
                <span class="ident">map</span>.<span class="ident">bus_routes</span>[<span class="ident">id</span>.<span class="number">0</span>].<span class="ident">spawn_times</span> <span class="op">=</span> <span class="ident">new</span>.<span class="ident">clone</span>();
            }
        }
    }

    <span class="kw">fn</span> <span class="ident">undo</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">EditCmd</span> {
        <span class="kw">match</span> <span class="self">self</span> {
            <span class="ident">EditCmd</span>::<span class="ident">ChangeRoad</span> { <span class="ident">r</span>, <span class="ident">old</span>, <span class="ident">new</span> } <span class="op">=</span><span class="op">&gt;</span> <span class="ident">EditCmd</span>::<span class="ident">ChangeRoad</span> {
                <span class="ident">r</span>,
                <span class="ident">old</span>: <span class="ident">new</span>,
                <span class="ident">new</span>: <span class="ident">old</span>,
            },
            <span class="ident">EditCmd</span>::<span class="ident">ChangeIntersection</span> { <span class="ident">i</span>, <span class="ident">old</span>, <span class="ident">new</span> } <span class="op">=</span><span class="op">&gt;</span> <span class="ident">EditCmd</span>::<span class="ident">ChangeIntersection</span> {
                <span class="ident">i</span>,
                <span class="ident">old</span>: <span class="ident">new</span>,
                <span class="ident">new</span>: <span class="ident">old</span>,
            },
            <span class="ident">EditCmd</span>::<span class="ident">ChangeRouteSchedule</span> { <span class="ident">id</span>, <span class="ident">old</span>, <span class="ident">new</span> } <span class="op">=</span><span class="op">&gt;</span> <span class="ident">EditCmd</span>::<span class="ident">ChangeRouteSchedule</span> {
                <span class="ident">id</span>,
                <span class="ident">old</span>: <span class="ident">new</span>,
                <span class="ident">new</span>: <span class="ident">old</span>,
            },
        }
    }
}

<span class="comment">// This clobbers previously set traffic signal overrides.</span>
<span class="comment">// TODO Step 1: Detect and warn about that</span>
<span class="comment">// TODO Step 2: Avoid when possible</span>
<span class="kw">fn</span> <span class="ident">recalculate_turns</span>(<span class="ident">id</span>: <span class="ident">IntersectionID</span>, <span class="ident">map</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Map</span>, <span class="ident">effects</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">EditEffects</span>) {
    <span class="kw">let</span> <span class="ident">i</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">map</span>.<span class="ident">intersections</span>[<span class="ident">id</span>.<span class="number">0</span>];

    <span class="kw">if</span> <span class="ident">i</span>.<span class="ident">is_border</span>() {
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">i</span>.<span class="ident">turns</span>.<span class="ident">is_empty</span>());
        <span class="kw">return</span>;
    }

    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">old_turns</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
    <span class="kw">for</span> <span class="ident">t</span> <span class="kw">in</span> <span class="ident">std</span>::<span class="ident">mem</span>::<span class="ident">replace</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">i</span>.<span class="ident">turns</span>, <span class="ident">BTreeSet</span>::<span class="ident">new</span>()) {
        <span class="ident">old_turns</span>.<span class="ident">push</span>(<span class="ident">map</span>.<span class="ident">turns</span>.<span class="ident">remove</span>(<span class="kw-2">&amp;</span><span class="ident">t</span>).<span class="ident">unwrap</span>());
        <span class="ident">effects</span>.<span class="ident">deleted_turns</span>.<span class="ident">insert</span>(<span class="ident">t</span>);
    }

    <span class="kw">if</span> <span class="ident">i</span>.<span class="ident">is_closed</span>() {
        <span class="kw">return</span>;
    }

    <span class="kw">let</span> <span class="ident">turns</span> <span class="op">=</span> <span class="kw">crate</span>::<span class="ident">make</span>::<span class="ident">turns</span>::<span class="ident">make_all_turns</span>(<span class="ident">map</span>, <span class="ident">map</span>.<span class="ident">get_i</span>(<span class="ident">id</span>));
    <span class="kw">let</span> <span class="ident">i</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">map</span>.<span class="ident">intersections</span>[<span class="ident">id</span>.<span class="number">0</span>];
    <span class="kw">for</span> <span class="ident">t</span> <span class="kw">in</span> <span class="ident">turns</span> {
        <span class="ident">effects</span>.<span class="ident">added_turns</span>.<span class="ident">insert</span>(<span class="ident">t</span>.<span class="ident">id</span>);
        <span class="ident">i</span>.<span class="ident">turns</span>.<span class="ident">insert</span>(<span class="ident">t</span>.<span class="ident">id</span>);
        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">_existing_t</span>) <span class="op">=</span> <span class="ident">old_turns</span>.<span class="ident">iter</span>().<span class="ident">find</span>(<span class="op">|</span><span class="ident">turn</span><span class="op">|</span> <span class="ident">turn</span>.<span class="ident">id</span> <span class="op">=</span><span class="op">=</span> <span class="ident">t</span>.<span class="ident">id</span>) {
            <span class="comment">// TODO Except for lookup_idx</span>
            <span class="comment">//assert_eq!(t, *existing_t);</span>
        }
        <span class="ident">map</span>.<span class="ident">turns</span>.<span class="ident">insert</span>(<span class="ident">t</span>.<span class="ident">id</span>, <span class="ident">t</span>);
    }

    <span class="kw">match</span> <span class="ident">i</span>.<span class="ident">intersection_type</span> {
        <span class="ident">IntersectionType</span>::<span class="ident">StopSign</span> <span class="op">=</span><span class="op">&gt;</span> {
            <span class="comment">// Stop sign policy usually doesn&#39;t depend on incoming lane types, except when changing</span>
            <span class="comment">// to/from construction. To be safe, always regenerate. Edits to stop signs are rare</span>
            <span class="comment">// anyway. And when we&#39;re smarter about preserving traffic signal changes in the face</span>
            <span class="comment">// of lane changes, we can do the same here.</span>
            <span class="ident">map</span>.<span class="ident">stop_signs</span>.<span class="ident">insert</span>(<span class="ident">id</span>, <span class="ident">ControlStopSign</span>::<span class="ident">new</span>(<span class="ident">map</span>, <span class="ident">id</span>));
        }
        <span class="ident">IntersectionType</span>::<span class="ident">TrafficSignal</span> <span class="op">=</span><span class="op">&gt;</span> {
            <span class="ident">map</span>.<span class="ident">traffic_signals</span>
                .<span class="ident">insert</span>(<span class="ident">id</span>, <span class="ident">ControlTrafficSignal</span>::<span class="ident">new</span>(<span class="ident">map</span>, <span class="ident">id</span>));
        }
        <span class="ident">IntersectionType</span>::<span class="ident">Border</span> <span class="op">|</span> <span class="ident">IntersectionType</span>::<span class="ident">Construction</span> <span class="op">=</span><span class="op">&gt;</span> <span class="macro">unreachable</span><span class="macro">!</span>(),
    }
}

<span class="kw">fn</span> <span class="ident">modify_lanes</span>(<span class="ident">map</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Map</span>, <span class="ident">r</span>: <span class="ident">RoadID</span>, <span class="ident">lanes_ltr</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">LaneSpec</span><span class="op">&gt;</span>, <span class="ident">effects</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">EditEffects</span>) {
    <span class="kw">let</span> <span class="ident">new_widths</span> <span class="op">=</span> <span class="ident">lanes_ltr</span>.<span class="ident">iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="ident">x</span>.<span class="ident">width</span>).<span class="ident">collect</span>::<span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="kw">_</span><span class="op">&gt;</span><span class="op">&gt;</span>();
    <span class="kw">let</span> <span class="ident">old_widths</span> <span class="op">=</span> <span class="ident">map</span>
        .<span class="ident">get_r</span>(<span class="ident">r</span>)
        .<span class="ident">lane_specs</span>(<span class="ident">map</span>)
        .<span class="ident">into_iter</span>()
        .<span class="ident">map</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="ident">x</span>.<span class="ident">width</span>)
        .<span class="ident">collect</span>::<span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="kw">_</span><span class="op">&gt;</span><span class="op">&gt;</span>();

    <span class="kw">let</span> <span class="ident">road</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">map</span>.<span class="ident">roads</span>[<span class="ident">r</span>.<span class="number">0</span>];

    <span class="comment">// TODO Widening roads is still experimental. If we&#39;re just modifying lane types, preserve</span>
    <span class="comment">// LaneIDs. If the number of lanes has changed or the order of widths, then use the new</span>
    <span class="comment">// code-path.</span>
    <span class="kw">if</span> <span class="ident">old_widths</span> <span class="op">=</span><span class="op">=</span> <span class="ident">new_widths</span> {
        <span class="kw">for</span> (<span class="ident">idx</span>, <span class="ident">spec</span>) <span class="kw">in</span> <span class="ident">lanes_ltr</span>.<span class="ident">into_iter</span>().<span class="ident">enumerate</span>() {
            <span class="kw">let</span> <span class="ident">lane</span> <span class="op">=</span> <span class="ident">map</span>.<span class="ident">lanes</span>.<span class="ident">get_mut</span>(<span class="kw-2">&amp;</span><span class="ident">road</span>.<span class="ident">lanes_ltr</span>[<span class="ident">idx</span>].<span class="number">0</span>).<span class="ident">unwrap</span>();
            <span class="ident">road</span>.<span class="ident">lanes_ltr</span>[<span class="ident">idx</span>].<span class="number">2</span> <span class="op">=</span> <span class="ident">spec</span>.<span class="ident">lt</span>;
            <span class="ident">lane</span>.<span class="ident">lane_type</span> <span class="op">=</span> <span class="ident">spec</span>.<span class="ident">lt</span>;

            <span class="comment">// Direction change?</span>
            <span class="kw">if</span> <span class="ident">road</span>.<span class="ident">lanes_ltr</span>[<span class="ident">idx</span>].<span class="number">1</span> <span class="op">!</span><span class="op">=</span> <span class="ident">spec</span>.<span class="ident">dir</span> {
                <span class="ident">road</span>.<span class="ident">lanes_ltr</span>[<span class="ident">idx</span>].<span class="number">1</span> <span class="op">=</span> <span class="ident">spec</span>.<span class="ident">dir</span>;
                <span class="ident">std</span>::<span class="ident">mem</span>::<span class="ident">swap</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">lane</span>.<span class="ident">src_i</span>, <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">lane</span>.<span class="ident">dst_i</span>);
                <span class="ident">lane</span>.<span class="ident">lane_center_pts</span> <span class="op">=</span> <span class="ident">lane</span>.<span class="ident">lane_center_pts</span>.<span class="ident">reversed</span>();
                <span class="ident">lane</span>.<span class="ident">dir</span> <span class="op">=</span> <span class="ident">spec</span>.<span class="ident">dir</span>;
            }
        }
        <span class="kw">return</span>;
    }

    <span class="comment">// First update intersection geometry and re-trim the road centers.</span>
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">road_geom_changed</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
    {
        <span class="kw">let</span> (<span class="ident">src_i</span>, <span class="ident">dst_i</span>) <span class="op">=</span> (<span class="ident">road</span>.<span class="ident">src_i</span>, <span class="ident">road</span>.<span class="ident">dst_i</span>);
        <span class="kw">let</span> <span class="ident">changed_road_width</span> <span class="op">=</span> <span class="ident">lanes_ltr</span>.<span class="ident">iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">spec</span><span class="op">|</span> <span class="ident">spec</span>.<span class="ident">width</span>).<span class="ident">sum</span>();
        <span class="ident">road_geom_changed</span>.<span class="ident">extend</span>(<span class="ident">recalculate_intersection_polygon</span>(
            <span class="ident">map</span>,
            <span class="ident">r</span>,
            <span class="ident">changed_road_width</span>,
            <span class="ident">src_i</span>,
        ));
        <span class="ident">road_geom_changed</span>.<span class="ident">extend</span>(<span class="ident">recalculate_intersection_polygon</span>(
            <span class="ident">map</span>,
            <span class="ident">r</span>,
            <span class="ident">changed_road_width</span>,
            <span class="ident">dst_i</span>,
        ));
    }

    <span class="comment">// Reborrow</span>
    <span class="kw">let</span> <span class="ident">road</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">map</span>.<span class="ident">roads</span>[<span class="ident">r</span>.<span class="number">0</span>];

    <span class="comment">// We may be adding lanes, deleting lanes, or just modifying existing ones. The width of</span>
    <span class="comment">// existing lanes may change. We could try to preserve existing LaneIDs and modify them, but</span>
    <span class="comment">// it&#39;s simpler to just delete all of the lanes and create them again.</span>

    <span class="kw">for</span> (<span class="ident">l</span>, <span class="kw">_</span>, <span class="kw">_</span>) <span class="kw">in</span> <span class="ident">road</span>.<span class="ident">lanes_ltr</span>.<span class="ident">drain</span>(..) {
        <span class="ident">map</span>.<span class="ident">lanes</span>.<span class="ident">remove</span>(<span class="kw-2">&amp;</span><span class="ident">l</span>).<span class="ident">unwrap</span>();
        <span class="ident">effects</span>.<span class="ident">deleted_lanes</span>.<span class="ident">insert</span>(<span class="ident">l</span>);
    }

    <span class="comment">// Create all of the road&#39;s lanes again, assigning new IDs.</span>
    <span class="comment">// This approach creates gaps in the lane ID space, since it deletes the contiguous block of a</span>
    <span class="comment">// road&#39;s lanes, then creates it again at the end. If this winds up mattering, we could use</span>
    <span class="comment">// different approaches for &quot;filling in the gaps.&quot;</span>
    <span class="kw">let</span> <span class="ident">new_lanes</span> <span class="op">=</span> <span class="ident">road</span>.<span class="ident">create_lanes</span>(<span class="ident">lanes_ltr</span>, <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">map</span>.<span class="ident">lane_id_counter</span>);
    <span class="kw">for</span> <span class="ident">lane</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="ident">new_lanes</span> {
        <span class="ident">road</span>.<span class="ident">lanes_ltr</span>.<span class="ident">push</span>((<span class="ident">lane</span>.<span class="ident">id</span>, <span class="ident">lane</span>.<span class="ident">dir</span>, <span class="ident">lane</span>.<span class="ident">lane_type</span>));
    }
    <span class="kw">for</span> <span class="ident">lane</span> <span class="kw">in</span> <span class="ident">new_lanes</span> {
        <span class="ident">map</span>.<span class="ident">lanes</span>.<span class="ident">insert</span>(<span class="ident">lane</span>.<span class="ident">id</span>, <span class="ident">lane</span>);
    }

    <span class="comment">// We might&#39;ve affected the geometry of other nearby roads. Recalculate the lanes for them as</span>
    <span class="comment">// well, but don&#39;t change the IDs.</span>
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">modified_lanes</span> <span class="op">=</span> <span class="ident">BTreeSet</span>::<span class="ident">new</span>();
    <span class="kw">for</span> <span class="ident">r</span> <span class="kw">in</span> <span class="ident">road_geom_changed</span> {
        <span class="ident">effects</span>.<span class="ident">changed_roads</span>.<span class="ident">insert</span>(<span class="ident">r</span>);
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">dummy_id_counter</span> <span class="op">=</span> <span class="number">0</span>;
        <span class="kw">let</span> <span class="ident">lanes_ltr</span> <span class="op">=</span> <span class="ident">map</span>.<span class="ident">get_r</span>(<span class="ident">r</span>).<span class="ident">lane_specs</span>(<span class="ident">map</span>);
        <span class="kw">let</span> <span class="ident">real_lane_ids</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">LaneID</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">map</span>
            .<span class="ident">get_r</span>(<span class="ident">r</span>)
            .<span class="ident">lanes_ltr</span>()
            .<span class="ident">into_iter</span>()
            .<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">l</span>, <span class="kw">_</span>, <span class="kw">_</span>)<span class="op">|</span> <span class="ident">l</span>)
            .<span class="ident">collect</span>();
        <span class="kw">for</span> (<span class="ident">lane</span>, <span class="ident">id</span>) <span class="kw">in</span> <span class="ident">map</span>
            .<span class="ident">get_r</span>(<span class="ident">r</span>)
            .<span class="ident">create_lanes</span>(<span class="ident">lanes_ltr</span>, <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">dummy_id_counter</span>)
            .<span class="ident">into_iter</span>()
            .<span class="ident">zip</span>(<span class="ident">real_lane_ids</span>.<span class="ident">into_iter</span>())
        {
            <span class="ident">map</span>.<span class="ident">lanes</span>.<span class="ident">get_mut</span>(<span class="kw-2">&amp;</span><span class="ident">id</span>).<span class="ident">unwrap</span>().<span class="ident">lane_center_pts</span> <span class="op">=</span> <span class="ident">lane</span>.<span class="ident">lane_center_pts</span>;
            <span class="ident">modified_lanes</span>.<span class="ident">insert</span>(<span class="ident">id</span>);
        }
    }
    <span class="ident">modified_lanes</span>.<span class="ident">extend</span>(<span class="ident">effects</span>.<span class="ident">deleted_lanes</span>.<span class="ident">clone</span>());

    <span class="comment">// Find all buildings connected to modified/deleted sidewalks</span>
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">recalc_buildings</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
    <span class="kw">for</span> <span class="ident">b</span> <span class="kw">in</span> <span class="ident">map</span>.<span class="ident">all_buildings</span>() {
        <span class="kw">if</span> <span class="ident">modified_lanes</span>.<span class="ident">contains</span>(<span class="kw-2">&amp;</span><span class="ident">b</span>.<span class="ident">sidewalk</span>()) {
            <span class="ident">recalc_buildings</span>.<span class="ident">push</span>(<span class="ident">b</span>.<span class="ident">id</span>);
            <span class="ident">effects</span>.<span class="ident">resnapped_buildings</span> <span class="op">=</span> <span class="bool-val">true</span>;
        }
    }
    <span class="ident">fix_building_driveways</span>(<span class="ident">map</span>, <span class="ident">recalc_buildings</span>);

    <span class="comment">// Same for parking lots</span>
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">recalc_parking_lots</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
    <span class="kw">for</span> <span class="ident">pl</span> <span class="kw">in</span> <span class="ident">map</span>.<span class="ident">all_parking_lots</span>() {
        <span class="kw">if</span> <span class="ident">modified_lanes</span>.<span class="ident">contains</span>(<span class="kw-2">&amp;</span><span class="ident">pl</span>.<span class="ident">driving_pos</span>.<span class="ident">lane</span>())
            <span class="op">|</span><span class="op">|</span> <span class="ident">modified_lanes</span>.<span class="ident">contains</span>(<span class="kw-2">&amp;</span><span class="ident">pl</span>.<span class="ident">sidewalk_pos</span>.<span class="ident">lane</span>())
        {
            <span class="ident">recalc_parking_lots</span>.<span class="ident">push</span>(<span class="ident">pl</span>.<span class="ident">id</span>);
            <span class="ident">effects</span>.<span class="ident">changed_parking_lots</span>.<span class="ident">insert</span>(<span class="ident">pl</span>.<span class="ident">id</span>);
        }
    }
    <span class="ident">fix_parking_lot_driveways</span>(<span class="ident">map</span>, <span class="ident">recalc_parking_lots</span>);

    <span class="comment">// TODO We need to update bus stops -- they may refer to an old ID.</span>
}

<span class="comment">// Returns the other roads affected by this change, not counting changed_road.</span>
<span class="kw">fn</span> <span class="ident">recalculate_intersection_polygon</span>(
    <span class="ident">map</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Map</span>,
    <span class="ident">changed_road</span>: <span class="ident">RoadID</span>,
    <span class="ident">changed_road_width</span>: <span class="ident">Distance</span>,
    <span class="ident">i</span>: <span class="ident">IntersectionID</span>,
) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">RoadID</span><span class="op">&gt;</span> {
    <span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">make</span>::<span class="ident">initial</span>;

    <span class="kw">let</span> <span class="ident">intersection</span> <span class="op">=</span> <span class="ident">map</span>.<span class="ident">get_i</span>(<span class="ident">i</span>);

    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">intersection_roads</span> <span class="op">=</span> <span class="ident">BTreeSet</span>::<span class="ident">new</span>();
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">roads</span> <span class="op">=</span> <span class="ident">BTreeMap</span>::<span class="ident">new</span>();
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">modify_roads</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
    <span class="kw">for</span> <span class="ident">r</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="ident">intersection</span>.<span class="ident">roads</span> {
        <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">map</span>.<span class="ident">get_r</span>(<span class="kw-2">*</span><span class="ident">r</span>);
        <span class="ident">modify_roads</span>.<span class="ident">push</span>((<span class="ident">r</span>.<span class="ident">orig_id</span>, <span class="ident">r</span>.<span class="ident">id</span>));
        <span class="ident">intersection_roads</span>.<span class="ident">insert</span>(<span class="ident">r</span>.<span class="ident">orig_id</span>);
        <span class="kw">let</span> <span class="ident">half_width</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">r</span>.<span class="ident">id</span> <span class="op">=</span><span class="op">=</span> <span class="ident">changed_road</span> {
            <span class="ident">changed_road_width</span> <span class="op">/</span> <span class="number">2.0</span>
        } <span class="kw">else</span> {
            <span class="ident">r</span>.<span class="ident">get_half_width</span>(<span class="ident">map</span>)
        };
        <span class="ident">roads</span>.<span class="ident">insert</span>(
            <span class="ident">r</span>.<span class="ident">orig_id</span>,
            <span class="ident">initial</span>::<span class="ident">Road</span> {
                <span class="ident">id</span>: <span class="ident">r</span>.<span class="ident">orig_id</span>,
                <span class="ident">src_i</span>: <span class="ident">r</span>.<span class="ident">orig_id</span>.<span class="ident">i1</span>,
                <span class="ident">dst_i</span>: <span class="ident">r</span>.<span class="ident">orig_id</span>.<span class="ident">i2</span>,
                <span class="comment">// TODO Untrim?</span>
                <span class="ident">trimmed_center_pts</span>: <span class="ident">r</span>.<span class="ident">center_pts</span>.<span class="ident">clone</span>(),
                <span class="ident">half_width</span>,
                <span class="comment">// Unused</span>
                <span class="ident">lane_specs_ltr</span>: <span class="ident">Vec</span>::<span class="ident">new</span>(),
                <span class="ident">osm_tags</span>: <span class="ident">r</span>.<span class="ident">osm_tags</span>.<span class="ident">clone</span>(),
            },
        );
    }

    <span class="kw">let</span> <span class="ident">polygon</span> <span class="op">=</span> <span class="ident">initial</span>::<span class="ident">intersection_polygon</span>(
        <span class="ident">intersection</span>.<span class="ident">orig_id</span>,
        <span class="ident">intersection_roads</span>.<span class="ident">clone</span>(),
        <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">roads</span>,
        <span class="ident">intersection</span>.<span class="ident">merged</span>,
    )
    .<span class="ident">unwrap</span>()
    .<span class="number">0</span>;

    <span class="ident">map</span>.<span class="ident">intersections</span>[<span class="ident">i</span>.<span class="number">0</span>].<span class="ident">polygon</span> <span class="op">=</span> <span class="ident">polygon</span>;
    <span class="comment">// Copy over the re-trimmed road centers</span>
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">affected</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
    <span class="kw">for</span> (<span class="ident">orig_id</span>, <span class="ident">id</span>) <span class="kw">in</span> <span class="ident">modify_roads</span> {
        <span class="ident">map</span>.<span class="ident">roads</span>[<span class="ident">id</span>.<span class="number">0</span>].<span class="ident">center_pts</span> <span class="op">=</span> <span class="ident">roads</span>.<span class="ident">remove</span>(<span class="kw-2">&amp;</span><span class="ident">orig_id</span>).<span class="ident">unwrap</span>().<span class="ident">trimmed_center_pts</span>;
        <span class="kw">if</span> <span class="ident">id</span> <span class="op">!</span><span class="op">=</span> <span class="ident">changed_road</span> {
            <span class="ident">affected</span>.<span class="ident">push</span>(<span class="ident">id</span>);
        }
    }
    <span class="ident">affected</span>
}

<span class="doccomment">/// Recalculate the driveways of some buildings after map edits.</span>
<span class="kw">fn</span> <span class="ident">fix_building_driveways</span>(<span class="ident">map</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Map</span>, <span class="ident">input</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">BuildingID</span><span class="op">&gt;</span>) {
    <span class="comment">// TODO Copying from make/buildings.rs</span>
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">center_per_bldg</span>: <span class="ident">BTreeMap</span><span class="op">&lt;</span><span class="ident">BuildingID</span>, <span class="ident">HashablePt2D</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">BTreeMap</span>::<span class="ident">new</span>();
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">query</span>: <span class="ident">HashSet</span><span class="op">&lt;</span><span class="ident">HashablePt2D</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="ident">new</span>();
    <span class="kw">for</span> <span class="ident">id</span> <span class="kw">in</span> <span class="ident">input</span> {
        <span class="kw">let</span> <span class="ident">center</span> <span class="op">=</span> <span class="ident">map</span>.<span class="ident">get_b</span>(<span class="ident">id</span>).<span class="ident">polygon</span>.<span class="ident">center</span>().<span class="ident">to_hashable</span>();
        <span class="ident">center_per_bldg</span>.<span class="ident">insert</span>(<span class="ident">id</span>, <span class="ident">center</span>);
        <span class="ident">query</span>.<span class="ident">insert</span>(<span class="ident">center</span>);
    }

    <span class="kw">let</span> <span class="ident">sidewalk_buffer</span> <span class="op">=</span> <span class="ident">Distance</span>::<span class="ident">meters</span>(<span class="number">7.5</span>);
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">sidewalk_pts</span> <span class="op">=</span> <span class="ident">match_points_to_lanes</span>(
        <span class="ident">map</span>.<span class="ident">get_bounds</span>(),
        <span class="ident">query</span>,
        <span class="ident">map</span>.<span class="ident">all_lanes</span>(),
        <span class="op">|</span><span class="ident">l</span><span class="op">|</span> <span class="ident">l</span>.<span class="ident">is_walkable</span>(),
        <span class="comment">// Don&#39;t put connections too close to intersections</span>
        <span class="ident">sidewalk_buffer</span>,
        <span class="comment">// Try not to skip any buildings, but more than 1km from a sidewalk is a little much</span>
        <span class="ident">Distance</span>::<span class="ident">meters</span>(<span class="number">1000.0</span>),
        <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Timer</span>::<span class="ident">throwaway</span>(),
    );

    <span class="kw">for</span> (<span class="ident">id</span>, <span class="ident">bldg_center</span>) <span class="kw">in</span> <span class="ident">center_per_bldg</span> {
        <span class="kw">match</span> <span class="ident">sidewalk_pts</span>.<span class="ident">remove</span>(<span class="kw-2">&amp;</span><span class="ident">bldg_center</span>).<span class="ident">and_then</span>(<span class="op">|</span><span class="ident">pos</span><span class="op">|</span> {
            <span class="kw">match</span> <span class="ident">Line</span>::<span class="ident">new</span>(<span class="ident">bldg_center</span>.<span class="ident">to_pt2d</span>(), <span class="ident">pos</span>.<span class="ident">pt</span>(<span class="ident">map</span>)) {
                <span class="prelude-val">Some</span>(<span class="ident">l</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="prelude-val">Some</span>((<span class="ident">pos</span>, <span class="ident">trim_path</span>(<span class="kw-2">&amp;</span><span class="ident">map</span>.<span class="ident">get_b</span>(<span class="ident">id</span>).<span class="ident">polygon</span>, <span class="ident">l</span>))),
                <span class="prelude-val">None</span> <span class="op">=</span><span class="op">&gt;</span> <span class="prelude-val">None</span>,
            }
        }) {
            <span class="prelude-val">Some</span>((<span class="ident">sidewalk_pos</span>, <span class="ident">driveway_geom</span>)) <span class="op">=</span><span class="op">&gt;</span> {
                <span class="kw">let</span> <span class="ident">b</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">map</span>.<span class="ident">buildings</span>[<span class="ident">id</span>.<span class="number">0</span>];
                <span class="ident">b</span>.<span class="ident">sidewalk_pos</span> <span class="op">=</span> <span class="ident">sidewalk_pos</span>;
                <span class="ident">b</span>.<span class="ident">driveway_geom</span> <span class="op">=</span> <span class="ident">driveway_geom</span>.<span class="ident">to_polyline</span>();
            }
            <span class="prelude-val">None</span> <span class="op">=</span><span class="op">&gt;</span> {
                <span class="comment">// TODO Not sure what to do here yet.</span>
                <span class="macro">error</span><span class="macro">!</span>(<span class="string">&quot;{} isn&#39;t snapped to a sidewalk now!&quot;</span>, <span class="ident">id</span>);
            }
        }
    }
}

<span class="doccomment">/// Recalculate the driveways of some parking lots after map edits.</span>
<span class="kw">fn</span> <span class="ident">fix_parking_lot_driveways</span>(<span class="ident">map</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Map</span>, <span class="ident">input</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">ParkingLotID</span><span class="op">&gt;</span>) {
    <span class="comment">// TODO Partly copying from make/parking_lots.rs</span>
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">center_per_lot</span>: <span class="ident">Vec</span><span class="op">&lt;</span>(<span class="ident">ParkingLotID</span>, <span class="ident">HashablePt2D</span>)<span class="op">&gt;</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">query</span>: <span class="ident">HashSet</span><span class="op">&lt;</span><span class="ident">HashablePt2D</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="ident">new</span>();
    <span class="kw">for</span> <span class="ident">id</span> <span class="kw">in</span> <span class="ident">input</span> {
        <span class="kw">let</span> <span class="ident">center</span> <span class="op">=</span> <span class="ident">map</span>.<span class="ident">get_pl</span>(<span class="ident">id</span>).<span class="ident">polygon</span>.<span class="ident">center</span>().<span class="ident">to_hashable</span>();
        <span class="ident">center_per_lot</span>.<span class="ident">push</span>((<span class="ident">id</span>, <span class="ident">center</span>));
        <span class="ident">query</span>.<span class="ident">insert</span>(<span class="ident">center</span>);
    }

    <span class="kw">let</span> <span class="ident">sidewalk_buffer</span> <span class="op">=</span> <span class="ident">Distance</span>::<span class="ident">meters</span>(<span class="number">7.5</span>);
    <span class="kw">let</span> <span class="ident">sidewalk_pts</span> <span class="op">=</span> <span class="ident">match_points_to_lanes</span>(
        <span class="ident">map</span>.<span class="ident">get_bounds</span>(),
        <span class="ident">query</span>,
        <span class="ident">map</span>.<span class="ident">all_lanes</span>(),
        <span class="op">|</span><span class="ident">l</span><span class="op">|</span> <span class="ident">l</span>.<span class="ident">is_walkable</span>(),
        <span class="ident">sidewalk_buffer</span>,
        <span class="ident">Distance</span>::<span class="ident">meters</span>(<span class="number">1000.0</span>),
        <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Timer</span>::<span class="ident">throwaway</span>(),
    );

    <span class="kw">for</span> (<span class="ident">id</span>, <span class="ident">center</span>) <span class="kw">in</span> <span class="ident">center_per_lot</span> {
        <span class="kw">match</span> <span class="ident">snap_driveway</span>(<span class="ident">center</span>, <span class="kw-2">&amp;</span><span class="ident">map</span>.<span class="ident">get_pl</span>(<span class="ident">id</span>).<span class="ident">polygon</span>, <span class="kw-2">&amp;</span><span class="ident">sidewalk_pts</span>, <span class="ident">map</span>) {
            <span class="prelude-val">Ok</span>((<span class="ident">driveway_line</span>, <span class="ident">driving_pos</span>, <span class="ident">sidewalk_line</span>, <span class="ident">sidewalk_pos</span>)) <span class="op">=</span><span class="op">&gt;</span> {
                <span class="kw">let</span> <span class="ident">pl</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">map</span>.<span class="ident">parking_lots</span>[<span class="ident">id</span>.<span class="number">0</span>];
                <span class="ident">pl</span>.<span class="ident">driveway_line</span> <span class="op">=</span> <span class="ident">driveway_line</span>;
                <span class="ident">pl</span>.<span class="ident">driving_pos</span> <span class="op">=</span> <span class="ident">driving_pos</span>;
                <span class="ident">pl</span>.<span class="ident">sidewalk_line</span> <span class="op">=</span> <span class="ident">sidewalk_line</span>;
                <span class="ident">pl</span>.<span class="ident">sidewalk_pos</span> <span class="op">=</span> <span class="ident">sidewalk_pos</span>;
            }
            <span class="prelude-val">Err</span>(<span class="ident">err</span>) <span class="op">=</span><span class="op">&gt;</span> {
                <span class="comment">// TODO Not sure what to do here yet.</span>
                <span class="macro">error</span><span class="macro">!</span>(<span class="string">&quot;{} isn&#39;t snapped to a sidewalk now: {}&quot;</span>, <span class="ident">id</span>, <span class="ident">err</span>);
            }
        }
    }
}

<span class="kw">impl</span> <span class="ident">Map</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new_edits</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">MapEdits</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">edits</span> <span class="op">=</span> <span class="ident">MapEdits</span>::<span class="ident">new</span>();

        <span class="comment">// Automatically find a new filename</span>
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">i</span> <span class="op">=</span> <span class="number">1</span>;
        <span class="kw">loop</span> {
            <span class="kw">let</span> <span class="ident">name</span> <span class="op">=</span> <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;Untitled Proposal {}&quot;</span>, <span class="ident">i</span>);
            <span class="kw">if</span> <span class="op">!</span><span class="ident">abstio</span>::<span class="ident">file_exists</span>(<span class="ident">abstio</span>::<span class="ident">path_edits</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">name</span>, <span class="kw-2">&amp;</span><span class="ident">name</span>)) {
                <span class="ident">edits</span>.<span class="ident">edits_name</span> <span class="op">=</span> <span class="ident">name</span>;
                <span class="kw">return</span> <span class="ident">edits</span>;
            }
            <span class="ident">i</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_edits</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="kw-2">&amp;</span><span class="ident">MapEdits</span> {
        <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">edits</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">unsaved_edits</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span> {
        <span class="self">self</span>.<span class="ident">edits</span>.<span class="ident">edits_name</span>.<span class="ident">starts_with</span>(<span class="string">&quot;Untitled Proposal&quot;</span>) <span class="op">&amp;&amp;</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">edits</span>.<span class="ident">commands</span>.<span class="ident">is_empty</span>()
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_r_edit</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">r</span>: <span class="ident">RoadID</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">EditRoad</span> {
        <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">get_r</span>(<span class="ident">r</span>);
        <span class="ident">EditRoad</span> {
            <span class="ident">lanes_ltr</span>: <span class="ident">r</span>.<span class="ident">lane_specs</span>(<span class="self">self</span>),
            <span class="ident">speed_limit</span>: <span class="ident">r</span>.<span class="ident">speed_limit</span>,
            <span class="ident">access_restrictions</span>: <span class="ident">r</span>.<span class="ident">access_restrictions</span>.<span class="ident">clone</span>(),
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">edit_road_cmd</span><span class="op">&lt;</span><span class="ident">F</span>: <span class="ident">Fn</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">EditRoad</span>)<span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">r</span>: <span class="ident">RoadID</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">EditCmd</span> {
        <span class="kw">let</span> <span class="ident">old</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">get_r_edit</span>(<span class="ident">r</span>);
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">new</span> <span class="op">=</span> <span class="ident">old</span>.<span class="ident">clone</span>();
        <span class="ident">f</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">new</span>);
        <span class="ident">EditCmd</span>::<span class="ident">ChangeRoad</span> { <span class="ident">r</span>, <span class="ident">old</span>, <span class="ident">new</span> }
    }

    <span class="doccomment">/// Panics on borders</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_i_edit</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">i</span>: <span class="ident">IntersectionID</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">EditIntersection</span> {
        <span class="kw">match</span> <span class="self">self</span>.<span class="ident">get_i</span>(<span class="ident">i</span>).<span class="ident">intersection_type</span> {
            <span class="ident">IntersectionType</span>::<span class="ident">StopSign</span> <span class="op">=</span><span class="op">&gt;</span> <span class="ident">EditIntersection</span>::<span class="ident">StopSign</span>(<span class="self">self</span>.<span class="ident">get_stop_sign</span>(<span class="ident">i</span>).<span class="ident">clone</span>()),
            <span class="ident">IntersectionType</span>::<span class="ident">TrafficSignal</span> <span class="op">=</span><span class="op">&gt;</span> {
                <span class="ident">EditIntersection</span>::<span class="ident">TrafficSignal</span>(<span class="self">self</span>.<span class="ident">get_traffic_signal</span>(<span class="ident">i</span>).<span class="ident">export</span>(<span class="self">self</span>))
            }
            <span class="ident">IntersectionType</span>::<span class="ident">Construction</span> <span class="op">=</span><span class="op">&gt;</span> <span class="ident">EditIntersection</span>::<span class="ident">Closed</span>,
            <span class="ident">IntersectionType</span>::<span class="ident">Border</span> <span class="op">=</span><span class="op">&gt;</span> <span class="macro">unreachable</span><span class="macro">!</span>(),
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">save_edits</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) {
        <span class="comment">// Don&#39;t overwrite the current edits with the compressed first. Otherwise, undo/redo order</span>
        <span class="comment">// in the UI gets messed up.</span>
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">edits</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">edits</span>.<span class="ident">clone</span>();
        <span class="ident">edits</span>.<span class="ident">commands</span>.<span class="ident">clear</span>();
        <span class="ident">edits</span>.<span class="ident">compress</span>(<span class="self">self</span>);
        <span class="ident">edits</span>.<span class="ident">save</span>(<span class="self">self</span>);
    }

    <span class="doccomment">/// Returns (changed_roads, deleted_lanes, deleted_turns, added_turns, changed_intersections)</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">must_apply_edits</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">new_edits</span>: <span class="ident">MapEdits</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">EditEffects</span> {
        <span class="self">self</span>.<span class="ident">apply_edits</span>(<span class="ident">new_edits</span>, <span class="bool-val">true</span>)
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">try_apply_edits</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">new_edits</span>: <span class="ident">MapEdits</span>) {
        <span class="self">self</span>.<span class="ident">apply_edits</span>(<span class="ident">new_edits</span>, <span class="bool-val">false</span>);
    }

    <span class="comment">// new_edits don&#39;t necessarily have to be valid; this could be used for speculatively testing</span>
    <span class="comment">// edits. Doesn&#39;t update pathfinding yet.</span>
    <span class="kw">fn</span> <span class="ident">apply_edits</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">new_edits</span>: <span class="ident">MapEdits</span>, <span class="ident">enforce_valid</span>: <span class="ident">bool</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">EditEffects</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">effects</span> <span class="op">=</span> <span class="ident">EditEffects</span> {
            <span class="ident">changed_roads</span>: <span class="ident">BTreeSet</span>::<span class="ident">new</span>(),
            <span class="ident">deleted_lanes</span>: <span class="ident">BTreeSet</span>::<span class="ident">new</span>(),
            <span class="ident">changed_intersections</span>: <span class="ident">BTreeSet</span>::<span class="ident">new</span>(),
            <span class="ident">added_turns</span>: <span class="ident">BTreeSet</span>::<span class="ident">new</span>(),
            <span class="ident">deleted_turns</span>: <span class="ident">BTreeSet</span>::<span class="ident">new</span>(),
            <span class="ident">resnapped_buildings</span>: <span class="bool-val">false</span>,
            <span class="ident">changed_parking_lots</span>: <span class="ident">BTreeSet</span>::<span class="ident">new</span>(),
        };

        <span class="comment">// Short-circuit to avoid marking pathfinder_dirty</span>
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">edits</span> <span class="op">=</span><span class="op">=</span> <span class="ident">new_edits</span> {
            <span class="kw">return</span> <span class="ident">effects</span>;
        }

        <span class="comment">// We need to undo() all of the current commands in reverse order, then apply() all of the</span>
        <span class="comment">// new commands. But in many cases, new_edits is just the current edits with a few commands</span>
        <span class="comment">// at the end. So a simple optimization with equivalent behavior is to skip the common</span>
        <span class="comment">// prefix of commands.</span>
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">start_at_idx</span> <span class="op">=</span> <span class="number">0</span>;
        <span class="kw">for</span> (<span class="ident">cmd1</span>, <span class="ident">cmd2</span>) <span class="kw">in</span> <span class="self">self</span>.<span class="ident">edits</span>.<span class="ident">commands</span>.<span class="ident">iter</span>().<span class="ident">zip</span>(<span class="ident">new_edits</span>.<span class="ident">commands</span>.<span class="ident">iter</span>()) {
            <span class="kw">if</span> <span class="ident">cmd1</span> <span class="op">=</span><span class="op">=</span> <span class="ident">cmd2</span> {
                <span class="ident">start_at_idx</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
            } <span class="kw">else</span> {
                <span class="kw">break</span>;
            }
        }

        <span class="comment">// Undo existing edits</span>
        <span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="ident">start_at_idx</span>..<span class="self">self</span>.<span class="ident">edits</span>.<span class="ident">commands</span>.<span class="ident">len</span>() {
            <span class="self">self</span>.<span class="ident">edits</span>
                .<span class="ident">commands</span>
                .<span class="ident">pop</span>()
                .<span class="ident">unwrap</span>()
                .<span class="ident">undo</span>()
                .<span class="ident">apply</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">effects</span>, <span class="self">self</span>);
        }

        <span class="comment">// Apply new edits.</span>
        <span class="kw">for</span> <span class="ident">cmd</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="ident">new_edits</span>.<span class="ident">commands</span>[<span class="ident">start_at_idx</span>..] {
            <span class="ident">cmd</span>.<span class="ident">apply</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">effects</span>, <span class="self">self</span>);
        }

        <span class="comment">// Might need to update bus stops.</span>
        <span class="kw">if</span> <span class="ident">enforce_valid</span> {
            <span class="kw">for</span> <span class="ident">id</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="ident">effects</span>.<span class="ident">changed_roads</span> {
                <span class="kw">let</span> <span class="ident">stops</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">get_r</span>(<span class="kw-2">*</span><span class="ident">id</span>).<span class="ident">all_bus_stops</span>(<span class="self">self</span>);
                <span class="kw">for</span> <span class="ident">s</span> <span class="kw">in</span> <span class="ident">stops</span> {
                    <span class="kw">let</span> <span class="ident">sidewalk_pos</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">get_bs</span>(<span class="ident">s</span>).<span class="ident">sidewalk_pos</span>;
                    <span class="comment">// Must exist, because we aren&#39;t allowed to orphan a bus stop.</span>
                    <span class="kw">let</span> <span class="ident">driving_lane</span> <span class="op">=</span> <span class="self">self</span>
                        .<span class="ident">get_r</span>(<span class="kw-2">*</span><span class="ident">id</span>)
                        .<span class="ident">find_closest_lane</span>(
                            <span class="ident">sidewalk_pos</span>.<span class="ident">lane</span>(),
                            <span class="op">|</span><span class="ident">l</span><span class="op">|</span> <span class="ident">PathConstraints</span>::<span class="ident">Bus</span>.<span class="ident">can_use</span>(<span class="ident">l</span>, <span class="self">self</span>),
                            <span class="self">self</span>,
                        )
                        .<span class="ident">unwrap</span>();
                    <span class="kw">let</span> <span class="ident">driving_pos</span> <span class="op">=</span> <span class="ident">sidewalk_pos</span>.<span class="ident">equiv_pos</span>(<span class="ident">driving_lane</span>, <span class="self">self</span>);
                    <span class="self">self</span>.<span class="ident">bus_stops</span>.<span class="ident">get_mut</span>(<span class="kw-2">&amp;</span><span class="ident">s</span>).<span class="ident">unwrap</span>().<span class="ident">driving_pos</span> <span class="op">=</span> <span class="ident">driving_pos</span>;
                }
            }
        }

        <span class="kw">let</span> <span class="ident">merge_zones_changed</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">edits</span>.<span class="ident">merge_zones</span> <span class="op">!</span><span class="op">=</span> <span class="ident">new_edits</span>.<span class="ident">merge_zones</span>;

        <span class="ident">new_edits</span>.<span class="ident">update_derived</span>(<span class="self">self</span>);
        <span class="self">self</span>.<span class="ident">edits</span> <span class="op">=</span> <span class="ident">new_edits</span>;
        <span class="self">self</span>.<span class="ident">pathfinder_dirty</span> <span class="op">=</span> <span class="bool-val">true</span>;

        <span class="comment">// Update zones after setting the new edits, since it&#39;ll pull merge_zones from there</span>
        <span class="kw">if</span> <span class="op">!</span><span class="ident">effects</span>.<span class="ident">changed_roads</span>.<span class="ident">is_empty</span>() <span class="op">|</span><span class="op">|</span> <span class="ident">merge_zones_changed</span> {
            <span class="self">self</span>.<span class="ident">zones</span> <span class="op">=</span> <span class="ident">Zone</span>::<span class="ident">make_all</span>(<span class="self">self</span>);
        }

        <span class="comment">// Some of these might&#39;ve been added, then later deleted.</span>
        <span class="ident">retain_btreeset</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">effects</span>.<span class="ident">added_turns</span>, <span class="op">|</span><span class="ident">t</span><span class="op">|</span> <span class="self">self</span>.<span class="ident">turns</span>.<span class="ident">contains_key</span>(<span class="ident">t</span>));

        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">more_changed_intersections</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
        <span class="kw">for</span> <span class="ident">t</span> <span class="kw">in</span> <span class="ident">effects</span>
            .<span class="ident">deleted_turns</span>
            .<span class="ident">iter</span>()
            .<span class="ident">chain</span>(<span class="ident">effects</span>.<span class="ident">added_turns</span>.<span class="ident">iter</span>())
        {
            <span class="ident">more_changed_intersections</span>.<span class="ident">push</span>(<span class="ident">t</span>.<span class="ident">parent</span>);
        }
        <span class="ident">effects</span>
            .<span class="ident">changed_intersections</span>
            .<span class="ident">extend</span>(<span class="ident">more_changed_intersections</span>);

        <span class="ident">effects</span>
    }

    <span class="doccomment">/// This can expensive, so don&#39;t constantly do it while editing in the UI. But this must happen</span>
    <span class="doccomment">/// before the simulation resumes.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">recalculate_pathfinding_after_edits</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">timer</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Timer</span>) {
        <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">pathfinder_dirty</span> {
            <span class="kw">return</span>;
        }

        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">pathfinder</span> <span class="op">=</span> <span class="ident">std</span>::<span class="ident">mem</span>::<span class="ident">replace</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">pathfinder</span>, <span class="ident">Pathfinder</span>::<span class="ident">Dijkstra</span>);
        <span class="ident">pathfinder</span>.<span class="ident">apply_edits</span>(<span class="self">self</span>, <span class="ident">timer</span>);
        <span class="self">self</span>.<span class="ident">pathfinder</span> <span class="op">=</span> <span class="ident">pathfinder</span>;

        <span class="comment">// Also recompute blackholes. This is cheap enough to do from scratch.</span>
        <span class="ident">timer</span>.<span class="ident">start</span>(<span class="string">&quot;recompute blackholes&quot;</span>);
        <span class="kw">for</span> <span class="ident">l</span> <span class="kw">in</span> <span class="self">self</span>.<span class="ident">lanes</span>.<span class="ident">values_mut</span>() {
            <span class="ident">l</span>.<span class="ident">driving_blackhole</span> <span class="op">=</span> <span class="bool-val">false</span>;
            <span class="ident">l</span>.<span class="ident">biking_blackhole</span> <span class="op">=</span> <span class="bool-val">false</span>;
        }
        <span class="kw">for</span> <span class="ident">l</span> <span class="kw">in</span> <span class="ident">connectivity</span>::<span class="ident">find_scc</span>(<span class="self">self</span>, <span class="ident">PathConstraints</span>::<span class="ident">Car</span>).<span class="number">1</span> {
            <span class="self">self</span>.<span class="ident">lanes</span>.<span class="ident">get_mut</span>(<span class="kw-2">&amp;</span><span class="ident">l</span>).<span class="ident">unwrap</span>().<span class="ident">driving_blackhole</span> <span class="op">=</span> <span class="bool-val">true</span>;
        }
        <span class="kw">for</span> <span class="ident">l</span> <span class="kw">in</span> <span class="ident">connectivity</span>::<span class="ident">find_scc</span>(<span class="self">self</span>, <span class="ident">PathConstraints</span>::<span class="ident">Bike</span>).<span class="number">1</span> {
            <span class="self">self</span>.<span class="ident">lanes</span>.<span class="ident">get_mut</span>(<span class="kw-2">&amp;</span><span class="ident">l</span>).<span class="ident">unwrap</span>().<span class="ident">biking_blackhole</span> <span class="op">=</span> <span class="bool-val">true</span>;
        }
        <span class="ident">timer</span>.<span class="ident">stop</span>(<span class="string">&quot;recompute blackholes&quot;</span>);

        <span class="self">self</span>.<span class="ident">pathfinder_dirty</span> <span class="op">=</span> <span class="bool-val">false</span>;
    }

    <span class="doccomment">/// Since the player is in the middle of editing, the signal may not be valid. Don&#39;t go through</span>
    <span class="doccomment">/// the entire apply_edits flow.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">incremental_edit_traffic_signal</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">signal</span>: <span class="ident">ControlTrafficSignal</span>) {
        <span class="macro">assert_eq</span><span class="macro">!</span>(
            <span class="self">self</span>.<span class="ident">get_i</span>(<span class="ident">signal</span>.<span class="ident">id</span>).<span class="ident">intersection_type</span>,
            <span class="ident">IntersectionType</span>::<span class="ident">TrafficSignal</span>
        );
        <span class="self">self</span>.<span class="ident">traffic_signals</span>.<span class="ident">insert</span>(<span class="ident">signal</span>.<span class="ident">id</span>, <span class="ident">signal</span>);
    }
}
</pre></div>
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