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Support unification of recursion vars in opaques

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Ayaz Hafiz 2022-07-08 15:31:29 -04:00
parent e1871c0bef
commit d9edb4d1bb
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3 changed files with 91 additions and 27 deletions
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18
crates/compiler/unify/src/unify.rs
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@ -786,6 +786,7 @@ fn unify_opaque<M: MetaCollector>(
Alias(_, _, other_real_var, AliasKind::Structural) => {
unify_pool(subs, pool, ctx.first, *other_real_var, ctx.mode)
}
RecursionVar { structure, .. } => unify_pool(subs, pool, ctx.first, *structure, ctx.mode),
Alias(other_symbol, other_args, other_real_var, AliasKind::Opaque) => {
// Opaques types are only equal if the opaque symbols are equal!
if symbol == *other_symbol {
@ -2583,19 +2584,14 @@ fn unify_recursion<M: MetaCollector>(
},
),
// _opaque has an underscore because it's unused in --release builds
Alias(_opaque, _, _, AliasKind::Opaque) => {
mismatch!(
"RecursionVar {:?} cannot be equal to opaque {:?}",
ctx.first,
_opaque
)
Alias(_, _, actual, AliasKind::Structural) => {
// look at the type the alias stands for
unify_pool(subs, pool, ctx.first, *actual, ctx.mode)
}
Alias(_, _, actual, _) => {
// look at the type the alias stands for
unify_pool(subs, pool, ctx.first, *actual, ctx.mode)
Alias(_, _, _, AliasKind::Opaque) => {
// look at the type the recursion var stands for
unify_pool(subs, pool, structure, ctx.second, ctx.mode)
}
RangedNumber(..) => mismatch!(