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This commit is contained in:
Folkert 2021-07-21 21:06:32 +02:00
parent c398adedf6
commit ca8041cfa3
1 changed files with 26 additions and 6 deletions
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32
compiler/unify/src/unify.rs
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@ -439,7 +439,7 @@ fn unify_tag_union(
pool,
ctx,
shared_tags,
MutMap::default(),
OtherTags::Empty,
rec1.ext,
recursion_var,
);
@ -461,7 +461,7 @@ fn unify_tag_union(
pool,
ctx,
shared_tags,
MutMap::default(),
OtherTags::Empty,
sub_record,
recursion_var,
);
@ -484,7 +484,7 @@ fn unify_tag_union(
pool,
ctx,
shared_tags,
MutMap::default(),
OtherTags::Empty,
sub_record,
recursion_var,
);
@ -493,7 +493,10 @@ fn unify_tag_union(
tag_problems
} else {
let other_tags = union(unique_tags1.clone(), &unique_tags2);
let other_tags = OtherTags::Union {
tags1: unique_tags1.clone(),
tags2: unique_tags2.clone(),
};
let ext = fresh(subs, pool, ctx, Content::FlexVar(None));
let flat_type1 = FlatType::TagUnion(unique_tags1, ext);
@ -772,12 +775,20 @@ fn unify_shared_tags_recursive_not_recursive(
}
}
enum OtherTags {
Empty,
Union {
tags1: MutMap<TagName, Vec<Variable>>,
tags2: MutMap<TagName, Vec<Variable>>,
},
}
fn unify_shared_tags(
subs: &mut Subs,
pool: &mut Pool,
ctx: &Context,
shared_tags: MutMap<TagName, (Vec<Variable>, Vec<Variable>)>,
other_tags: MutMap<TagName, Vec<Variable>>,
other_tags: OtherTags,
ext: Variable,
recursion_var: Option<Variable>,
) -> Outcome {
@ -837,7 +848,16 @@ fn unify_shared_tags(
Err((new, _)) => new,
};
let mut new_tags = union(matching_tags, &other_tags);
let mut new_tags = matching_tags;
match other_tags {
OtherTags::Empty => {}
OtherTags::Union { tags1, tags2 } => {
new_tags.extend(tags1);
new_tags.extend(tags2);
}
}
new_tags.extend(fields.into_iter());
let flat_type = if let Some(rec) = recursion_var {