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fix: unification bug

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This commit is contained in:
Shunsuke Shibayama 2025-02-25 15:33:21 +09:00
parent f6959ecca7
commit a10bc83d99
1 changed files with 12 additions and 1 deletions
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13
crates/erg_compiler/context/unify.rs
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@ -660,9 +660,11 @@ impl<L: Locational> Unifier<'_, '_, '_, L> {
self.sub_unify(&l, sup)?;
Ok(())
}
// OK: sub: (_: Nat), sup: 0
// ERR: sub: (_: Nat), sup: "a"
(TyParam::Erased(t), sup) => {
let sup_t = self.ctx.get_tp_t(sup)?;
if self.ctx.subtype_of(t, &sup_t) {
if self.ctx.subtype_of(t, &sup_t.derefine()) {
Ok(())
} else {
Err(TyCheckErrors::from(TyCheckError::subtyping_error(
@ -1774,6 +1776,15 @@ impl<L: Locational> Unifier<'_, '_, '_, L> {
for (sup_field, sup_ty) in self.ctx.fields(supe) {
if let Some((_, sub_ty)) = sub_fields.get_key_value(&sup_field) {
self.sub_unify(sub_ty, &sup_ty)?;
} else if let Some(sub_ty) =
self.ctx.coerce(sub.clone(), &()).ok().and_then(|coerced| {
let sub_fields = self.ctx.fields(&coerced);
let (_, sub_ty) = sub_fields.get_key_value(&sup_field)?;
Some(sub_ty.clone())
})
{
sub.destructive_coerce();
self.sub_unify(&sub_ty, &sup_ty)?;
} else {
return Err(TyCheckErrors::from(TyCheckError::no_attr_error(
self.ctx.cfg.input.clone(),