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fix: sub-unification bugs

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This commit is contained in:
Shunsuke Shibayama 2023-03-22 15:38:47 +09:00
parent b318395a32
commit 0079aed860
10 changed files with 190 additions and 153 deletions
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2
crates/erg_compiler/context/eval.rs
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@ -1184,7 +1184,7 @@ impl Context {
}
}
}
if let Type::FreeVar(fv) = &lhs {
if let Some(fv) = lhs.as_free() {
let (sub, sup) = fv.get_subsup().unwrap();
if self.is_trait(&sup) && !self.trait_impl_exists(&sub, &sup) {
// link to `Never` to prevent double errors from being reported