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fix: subtype check bug

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This commit is contained in:
Shunsuke Shibayama 2024-02-04 17:29:34 +09:00
parent 3be5d75d05
commit b8fe8fb205
3 changed files with 20 additions and 9 deletions
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17
crates/erg_compiler/context/compare.rs
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@ -899,19 +899,20 @@ impl Context {
self.supertype_of_tp(sup_p, fv.unsafe_crack(), variance)
}
(TyParam::Erased(t), _) => match variance {
Variance::Contravariant => self.subtype_of(t, &self.get_tp_t(sub_p).unwrap_or(Obj)),
Variance::Covariant => self.supertype_of(t, &self.get_tp_t(sub_p).unwrap_or(Obj)),
Variance::Invariant => {
Variance::Contravariant => {
let rhs = self.get_tp_t(sub_p).unwrap_or(Obj);
self.same_type_of(t, &rhs) || self.same_type_of(t, &rhs.derefine())
self.subtype_of(t, &rhs)
}
// REVIEW: invariant type parameters check
Variance::Covariant | Variance::Invariant => {
let rhs = self.get_tp_t(sub_p).unwrap_or(Obj);
self.supertype_of(t, &rhs)
}
},
(_, TyParam::Erased(t)) => match variance {
Variance::Contravariant => self.subtype_of(&self.get_tp_t(sup_p).unwrap_or(Obj), t),
Variance::Covariant => self.supertype_of(&self.get_tp_t(sup_p).unwrap_or(Obj), t),
Variance::Invariant => {
let lhs = self.get_tp_t(sup_p).unwrap_or(Obj);
self.same_type_of(&lhs, t) || self.same_type_of(&lhs.derefine(), t)
Variance::Covariant | Variance::Invariant => {
self.supertype_of(&self.get_tp_t(sup_p).unwrap_or(Obj), t)
}
},
(TyParam::Array(sup), TyParam::Array(sub))