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Delay add "is open" constraint until we know a type variable

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Ayaz Hafiz 2022-04-20 15:40:50 -04:00
parent 7b2b41869f
commit 504c3f9b49
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4 changed files with 54 additions and 8 deletions
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4
compiler/solve/src/solve.rs
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@ -1183,6 +1183,8 @@ fn solve(
let actual =
either_type_index_to_var(constraints, subs, rank, pools, aliases, *type_index);
// let content = subs.get_content_without_compacting(actual);
// let fmt = roc_types::subs::SubsFmtContent(&content, subs);
let mut stack = vec![actual];
while let Some(var) = stack.pop() {
let mut desc = subs.get(var);
@ -1190,7 +1192,7 @@ fn solve(
Content::Structure(FlatType::TagUnion(tags, ext))
if matches!(
subs.get_content_without_compacting(ext),
Content::Structure(FlatType::EmptyTagUnion)
_ // Content::Structure(FlatType::EmptyTagUnion)
) =>
{
let new_ext = subs.fresh_unnamed_flex_var();