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walk the chain till we find a tag union to make recursive
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4c62e335e5
commit
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@ -3138,3 +3138,49 @@ fn alias_defined_out_of_order() {
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RocStr
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);
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}
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#[test]
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#[cfg(any(feature = "gen-llvm"))]
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fn recursively_build_effect() {
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assert_evals_to!(
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indoc!(
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r#"
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app "test" provides [ main ] to "./platform"
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greeting =
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hi = "Hello"
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name = "World"
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"\(hi), \(name)!"
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main =
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when nestHelp 4 is
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_ -> greeting
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nestHelp : I64 -> XEffect {}
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nestHelp = \m ->
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when m is
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0 ->
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always {}
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_ ->
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always {} |> after \_ -> nestHelp (m - 1)
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XEffect a : [ @XEffect ({} -> a) ]
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always : a -> XEffect a
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always = \x -> @XEffect (\{} -> x)
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after : XEffect a, (a -> XEffect b) -> XEffect b
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after = \(@XEffect e), toB ->
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@XEffect \{} ->
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when toB (e {}) is
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@XEffect e2 ->
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e2 {}
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"#
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),
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RocStr::from_slice(b"Hello, World!"),
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RocStr
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);
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}
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@ -833,10 +833,21 @@ enum OtherTags2 {
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}
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fn maybe_mark_tag_union_recursive(subs: &mut Subs, tag_union_var: Variable) {
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while let Err((recursive, _chain)) = subs.occurs(tag_union_var) {
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'outer: while let Err((recursive, chain)) = subs.occurs(tag_union_var) {
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let description = subs.get(recursive);
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if let Content::Structure(FlatType::TagUnion(tags, ext_var)) = description.content {
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subs.mark_tag_union_recursive(recursive, tags, ext_var);
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} else {
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// walk the chain till we find a tag union
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for v in &chain[..chain.len() - 1] {
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let description = subs.get(*v);
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if let Content::Structure(FlatType::TagUnion(tags, ext_var)) = description.content {
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subs.mark_tag_union_recursive(*v, tags, ext_var);
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continue 'outer;
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}
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}
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panic!("recursive loop does not contain a tag union")
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}
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}
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}
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