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</pre><div class="example-wrap"><pre class="rust ">
<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="kw">use</span> <span class="ident">anyhow</span>::{<span class="ident">Context</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">abstio</span>::<span class="ident">MapName</span>;
<span class="kw">use</span> <span class="ident">abstutil</span>::{<span class="ident">deserialize_btreemap</span>, <span class="ident">serialize_btreemap</span>};
<span class="kw">use</span> <span class="ident">geom</span>::<span class="ident">Time</span>;

<span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">edits</span>::{<span class="ident">EditCmd</span>, <span class="ident">EditIntersection</span>, <span class="ident">EditRoad</span>, <span class="ident">MapEdits</span>};
<span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">raw</span>::<span class="ident">OriginalRoad</span>;
<span class="kw">use</span> <span class="kw">crate</span>::{<span class="ident">osm</span>, <span class="ident">ControlStopSign</span>, <span class="ident">IntersectionID</span>, <span class="ident">Map</span>};

<span class="doccomment">/// MapEdits are converted to this before serializing. Referencing things like LaneID in a Map won&#39;t</span>
<span class="doccomment">/// work if the basemap is rebuilt from new OSM data, so instead we use stabler OSM IDs that&#39;re less</span>
<span class="doccomment">/// likely to change.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Serialize</span>, <span class="ident">Deserialize</span>, <span class="ident">Clone</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">PermanentMapEdits</span> {
    <span class="kw">pub</span> <span class="ident">map_name</span>: <span class="ident">MapName</span>,
    <span class="kw">pub</span> <span class="ident">edits_name</span>: <span class="ident">String</span>,
    <span class="kw">pub</span> <span class="ident">version</span>: <span class="ident">usize</span>,
    <span class="ident">commands</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">PermanentEditCmd</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="ident">merge_zones</span>: <span class="ident">bool</span>,

    <span class="doccomment">/// Edits without these are player generated.</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="doccomment">/// The link is optional even for proposals</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">Serialize</span>, <span class="ident">Deserialize</span>, <span class="ident">Clone</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">PermanentEditIntersection</span> {
    <span class="ident">StopSign</span> {
        <span class="attribute">#[<span class="ident">serde</span>(
            <span class="ident">serialize_with</span> <span class="op">=</span> <span class="string">&quot;serialize_btreemap&quot;</span>,
            <span class="ident">deserialize_with</span> <span class="op">=</span> <span class="string">&quot;deserialize_btreemap&quot;</span>
        )]</span>
        <span class="ident">must_stop</span>: <span class="ident">BTreeMap</span><span class="op">&lt;</span><span class="ident">OriginalRoad</span>, <span class="ident">bool</span><span class="op">&gt;</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">Serialize</span>, <span class="ident">Deserialize</span>, <span class="ident">Clone</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">PermanentEditCmd</span> {
    <span class="ident">ChangeRoad</span> {
        <span class="ident">r</span>: <span class="ident">OriginalRoad</span>,
        <span class="ident">new</span>: <span class="ident">EditRoad</span>,
        <span class="ident">old</span>: <span class="ident">EditRoad</span>,
    },
    <span class="ident">ChangeIntersection</span> {
        <span class="ident">i</span>: <span class="ident">osm</span>::<span class="ident">NodeID</span>,
        <span class="ident">new</span>: <span class="ident">PermanentEditIntersection</span>,
        <span class="ident">old</span>: <span class="ident">PermanentEditIntersection</span>,
    },
    <span class="ident">ChangeRouteSchedule</span> {
        <span class="ident">osm_rel_id</span>: <span class="ident">osm</span>::<span class="ident">RelationID</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">impl</span> <span class="ident">EditCmd</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_perma</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">PermanentEditCmd</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">new</span>, <span class="ident">old</span> } <span class="op">=</span><span class="op">&gt;</span> <span class="ident">PermanentEditCmd</span>::<span class="ident">ChangeRoad</span> {
                <span class="ident">r</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">orig_id</span>,
                <span class="ident">new</span>: <span class="ident">new</span>.<span class="ident">clone</span>(),
                <span class="ident">old</span>: <span class="ident">old</span>.<span class="ident">clone</span>(),
            },
            <span class="ident">EditCmd</span>::<span class="ident">ChangeIntersection</span> { <span class="ident">i</span>, <span class="ident">new</span>, <span class="ident">old</span> } <span class="op">=</span><span class="op">&gt;</span> <span class="ident">PermanentEditCmd</span>::<span class="ident">ChangeIntersection</span> {
                <span class="ident">i</span>: <span class="ident">map</span>.<span class="ident">get_i</span>(<span class="kw-2">*</span><span class="ident">i</span>).<span class="ident">orig_id</span>,
                <span class="ident">new</span>: <span class="ident">new</span>.<span class="ident">to_permanent</span>(<span class="ident">map</span>),
                <span class="ident">old</span>: <span class="ident">old</span>.<span class="ident">to_permanent</span>(<span class="ident">map</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">PermanentEditCmd</span>::<span class="ident">ChangeRouteSchedule</span> {
                    <span class="ident">osm_rel_id</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">osm_rel_id</span>,
                    <span class="ident">old</span>: <span class="ident">old</span>.<span class="ident">clone</span>(),
                    <span class="ident">new</span>: <span class="ident">new</span>.<span class="ident">clone</span>(),
                }
            }
        }
    }
}

<span class="kw">impl</span> <span class="ident">PermanentEditCmd</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">into_cmd</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="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">EditCmd</span><span class="op">&gt;</span> {
        <span class="kw">match</span> <span class="self">self</span> {
            <span class="ident">PermanentEditCmd</span>::<span class="ident">ChangeRoad</span> { <span class="ident">r</span>, <span class="ident">new</span>, <span class="ident">old</span> } <span class="op">=</span><span class="op">&gt;</span> {
                <span class="kw">let</span> <span class="ident">id</span> <span class="op">=</span> <span class="ident">map</span>.<span class="ident">find_r_by_osm_id</span>(<span class="ident">r</span>)<span class="question-mark">?</span>;
                <span class="kw">let</span> <span class="ident">num_current</span> <span class="op">=</span> <span class="ident">map</span>.<span class="ident">get_r</span>(<span class="ident">id</span>).<span class="ident">lanes_ltr</span>().<span class="ident">len</span>();
                <span class="comment">// The basemap changed -- it&#39;d be pretty hard to understand the original</span>
                <span class="comment">// intent of the edit.</span>
                <span class="kw">if</span> <span class="ident">num_current</span> <span class="op">!</span><span class="op">=</span> <span class="ident">new</span>.<span class="ident">lanes_ltr</span>.<span class="ident">len</span>() {
                    <span class="macro">bail</span><span class="macro">!</span>(
                        <span class="string">&quot;number of lanes in {} is {} now, but {} in the edits&quot;</span>,
                        <span class="ident">r</span>,
                        <span class="ident">num_current</span>,
                        <span class="ident">new</span>.<span class="ident">lanes_ltr</span>.<span class="ident">len</span>()
                    );
                }
                <span class="prelude-val">Ok</span>(<span class="ident">EditCmd</span>::<span class="ident">ChangeRoad</span> { <span class="ident">r</span>: <span class="ident">id</span>, <span class="ident">new</span>, <span class="ident">old</span> })
            }
            <span class="ident">PermanentEditCmd</span>::<span class="ident">ChangeIntersection</span> { <span class="ident">i</span>, <span class="ident">new</span>, <span class="ident">old</span> } <span class="op">=</span><span class="op">&gt;</span> {
                <span class="kw">let</span> <span class="ident">id</span> <span class="op">=</span> <span class="ident">map</span>.<span class="ident">find_i_by_osm_id</span>(<span class="ident">i</span>)<span class="question-mark">?</span>;
                <span class="prelude-val">Ok</span>(<span class="ident">EditCmd</span>::<span class="ident">ChangeIntersection</span> {
                    <span class="ident">i</span>: <span class="ident">id</span>,
                    <span class="ident">new</span>: <span class="ident">new</span>
                        .<span class="ident">with_permanent</span>(<span class="ident">id</span>, <span class="ident">map</span>)
                        .<span class="ident">with_context</span>(<span class="op">|</span><span class="op">|</span> <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;new ChangeIntersection of {} invalid&quot;</span>, <span class="ident">i</span>))<span class="question-mark">?</span>,
                    <span class="ident">old</span>: <span class="ident">old</span>
                        .<span class="ident">with_permanent</span>(<span class="ident">id</span>, <span class="ident">map</span>)
                        .<span class="ident">with_context</span>(<span class="op">|</span><span class="op">|</span> <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;old ChangeIntersection of {} invalid&quot;</span>, <span class="ident">i</span>))<span class="question-mark">?</span>,
                })
            }
            <span class="ident">PermanentEditCmd</span>::<span class="ident">ChangeRouteSchedule</span> {
                <span class="ident">osm_rel_id</span>,
                <span class="ident">old</span>,
                <span class="ident">new</span>,
            } <span class="op">=</span><span class="op">&gt;</span> {
                <span class="kw">let</span> <span class="ident">id</span> <span class="op">=</span> <span class="ident">map</span>
                    .<span class="ident">find_br</span>(<span class="ident">osm_rel_id</span>)
                    .<span class="ident">ok_or_else</span>(<span class="op">|</span><span class="op">|</span> <span class="macro">anyhow</span><span class="macro">!</span>(<span class="string">&quot;can&#39;t find {}&quot;</span>, <span class="ident">osm_rel_id</span>))<span class="question-mark">?</span>;
                <span class="prelude-val">Ok</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="kw">impl</span> <span class="ident">MapEdits</span> {
    <span class="doccomment">/// Encode the edits in a permanent format, referring to more-stable OSM IDs.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_permanent</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">PermanentMapEdits</span> {
        <span class="ident">PermanentMapEdits</span> {
            <span class="ident">map_name</span>: <span class="ident">map</span>.<span class="ident">get_name</span>().<span class="ident">clone</span>(),
            <span class="ident">edits_name</span>: <span class="self">self</span>.<span class="ident">edits_name</span>.<span class="ident">clone</span>(),
            <span class="comment">// Increase this every time there&#39;s a schema change</span>
            <span class="ident">version</span>: <span class="number">9</span>,
            <span class="ident">proposal_description</span>: <span class="self">self</span>.<span class="ident">proposal_description</span>.<span class="ident">clone</span>(),
            <span class="ident">proposal_link</span>: <span class="self">self</span>.<span class="ident">proposal_link</span>.<span class="ident">clone</span>(),
            <span class="ident">commands</span>: <span class="self">self</span>.<span class="ident">commands</span>.<span class="ident">iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">cmd</span><span class="op">|</span> <span class="ident">cmd</span>.<span class="ident">to_perma</span>(<span class="ident">map</span>)).<span class="ident">collect</span>(),
            <span class="ident">merge_zones</span>: <span class="self">self</span>.<span class="ident">merge_zones</span>,
        }
    }
}

<span class="kw">impl</span> <span class="ident">PermanentMapEdits</span> {
    <span class="doccomment">/// Transform permanent edits to MapEdits, looking up the map IDs by the hopefully stabler OSM</span>
    <span class="doccomment">/// IDs. Validate that the basemap hasn&#39;t changed in important ways.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">into_edits</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="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">MapEdits</span><span class="op">&gt;</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">edits_name</span>: <span class="self">self</span>.<span class="ident">edits_name</span>,
            <span class="ident">proposal_description</span>: <span class="self">self</span>.<span class="ident">proposal_description</span>,
            <span class="ident">proposal_link</span>: <span class="self">self</span>.<span class="ident">proposal_link</span>,
            <span class="ident">commands</span>: <span class="self">self</span>
                .<span class="ident">commands</span>
                .<span class="ident">into_iter</span>()
                .<span class="ident">map</span>(<span class="op">|</span><span class="ident">cmd</span><span class="op">|</span> <span class="ident">cmd</span>.<span class="ident">into_cmd</span>(<span class="ident">map</span>))
                .<span class="ident">collect</span>::<span class="op">&lt;</span><span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">EditCmd</span><span class="op">&gt;</span><span class="op">&gt;</span><span class="op">&gt;</span>()<span class="question-mark">?</span>,
            <span class="ident">merge_zones</span>: <span class="self">self</span>.<span class="ident">merge_zones</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="ident">edits</span>.<span class="ident">update_derived</span>(<span class="ident">map</span>);
        <span class="prelude-val">Ok</span>(<span class="ident">edits</span>)
    }

    <span class="doccomment">/// Transform permanent edits to MapEdits, looking up the map IDs by the hopefully stabler OSM</span>
    <span class="doccomment">/// IDs. Strip out commands that&#39;re broken.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">into_edits_permissive</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">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">edits_name</span>: <span class="self">self</span>.<span class="ident">edits_name</span>,
            <span class="ident">proposal_description</span>: <span class="self">self</span>.<span class="ident">proposal_description</span>,
            <span class="ident">proposal_link</span>: <span class="self">self</span>.<span class="ident">proposal_link</span>,
            <span class="ident">commands</span>: <span class="self">self</span>
                .<span class="ident">commands</span>
                .<span class="ident">into_iter</span>()
                .<span class="ident">filter_map</span>(<span class="op">|</span><span class="ident">cmd</span><span class="op">|</span> <span class="ident">cmd</span>.<span class="ident">into_cmd</span>(<span class="ident">map</span>).<span class="ident">ok</span>())
                .<span class="ident">collect</span>(),
            <span class="ident">merge_zones</span>: <span class="self">self</span>.<span class="ident">merge_zones</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="ident">edits</span>.<span class="ident">update_derived</span>(<span class="ident">map</span>);
        <span class="ident">edits</span>
    }
}

<span class="kw">impl</span> <span class="ident">EditIntersection</span> {
    <span class="kw">fn</span> <span class="ident">to_permanent</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">PermanentEditIntersection</span> {
        <span class="kw">match</span> <span class="self">self</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">PermanentEditIntersection</span>::<span class="ident">StopSign</span> {
                <span class="ident">must_stop</span>: <span class="ident">ss</span>
                    .<span class="ident">roads</span>
                    .<span class="ident">iter</span>()
                    .<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">r</span>, <span class="ident">val</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">orig_id</span>, <span class="ident">val</span>.<span class="ident">must_stop</span>))
                    .<span class="ident">collect</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">PermanentEditIntersection</span>::<span class="ident">TrafficSignal</span>(<span class="ident">raw_ts</span>.<span class="ident">clone</span>())
            }
            <span class="ident">EditIntersection</span>::<span class="ident">Closed</span> <span class="op">=</span><span class="op">&gt;</span> <span class="ident">PermanentEditIntersection</span>::<span class="ident">Closed</span>,
        }
    }
}

<span class="kw">impl</span> <span class="ident">PermanentEditIntersection</span> {
    <span class="kw">fn</span> <span class="ident">with_permanent</span>(<span class="self">self</span>, <span class="ident">i</span>: <span class="ident">IntersectionID</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="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">EditIntersection</span><span class="op">&gt;</span> {
        <span class="kw">match</span> <span class="self">self</span> {
            <span class="ident">PermanentEditIntersection</span>::<span class="ident">StopSign</span> { <span class="ident">must_stop</span> } <span class="op">=</span><span class="op">&gt;</span> {
                <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">translated_must_stop</span> <span class="op">=</span> <span class="ident">BTreeMap</span>::<span class="ident">new</span>();
                <span class="kw">for</span> (<span class="ident">r</span>, <span class="ident">stop</span>) <span class="kw">in</span> <span class="ident">must_stop</span> {
                    <span class="ident">translated_must_stop</span>.<span class="ident">insert</span>(<span class="ident">map</span>.<span class="ident">find_r_by_osm_id</span>(<span class="ident">r</span>)<span class="question-mark">?</span>, <span class="ident">stop</span>);
                }

                <span class="comment">// Make sure the roads exactly match up</span>
                <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ss</span> <span class="op">=</span> <span class="ident">ControlStopSign</span>::<span class="ident">new</span>(<span class="ident">map</span>, <span class="ident">i</span>);
                <span class="kw">if</span> <span class="ident">translated_must_stop</span>.<span class="ident">len</span>() <span class="op">!</span><span class="op">=</span> <span class="ident">ss</span>.<span class="ident">roads</span>.<span class="ident">len</span>() {
                    <span class="macro">bail</span><span class="macro">!</span>(
                        <span class="string">&quot;Stop sign has {} roads now, but {} from edits&quot;</span>,
                        <span class="ident">ss</span>.<span class="ident">roads</span>.<span class="ident">len</span>(),
                        <span class="ident">translated_must_stop</span>.<span class="ident">len</span>()
                    );
                }
                <span class="kw">for</span> (<span class="ident">r</span>, <span class="ident">stop</span>) <span class="kw">in</span> <span class="ident">translated_must_stop</span> {
                    <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">road</span>) <span class="op">=</span> <span class="ident">ss</span>.<span class="ident">roads</span>.<span class="ident">get_mut</span>(<span class="kw-2">&amp;</span><span class="ident">r</span>) {
                        <span class="ident">road</span>.<span class="ident">must_stop</span> <span class="op">=</span> <span class="ident">stop</span>;
                    } <span class="kw">else</span> {
                        <span class="macro">bail</span><span class="macro">!</span>(<span class="string">&quot;{} doesn&#39;t connect to {}&quot;</span>, <span class="ident">i</span>, <span class="ident">r</span>);
                    }
                }

                <span class="prelude-val">Ok</span>(<span class="ident">EditIntersection</span>::<span class="ident">StopSign</span>(<span class="ident">ss</span>))
            }
            <span class="ident">PermanentEditIntersection</span>::<span class="ident">TrafficSignal</span>(<span class="ident">ts</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="prelude-val">Ok</span>(<span class="ident">EditIntersection</span>::<span class="ident">TrafficSignal</span>(<span class="ident">ts</span>)),
            <span class="ident">PermanentEditIntersection</span>::<span class="ident">Closed</span> <span class="op">=</span><span class="op">&gt;</span> <span class="prelude-val">Ok</span>(<span class="ident">EditIntersection</span>::<span class="ident">Closed</span>),
        }
    }
}
</pre></div>
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