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fix: Fix async block type inference using containing function return type

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This commit is contained in:
Lukas Wirth 2022-03-23 23:39:35 +01:00
parent de5925da5c
commit ed0c62597f
3 changed files with 56 additions and 2 deletions
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10
crates/hir_ty/src/infer/expr.rs
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@ -157,9 +157,17 @@ impl<'a> InferenceContext<'a> {
self.err_ty()
}
Expr::Async { body } => {
let ret_ty = self.table.new_type_var();
let prev_diverges = mem::replace(&mut self.diverges, Diverges::Maybe);
let prev_ret_ty = mem::replace(&mut self.return_ty, ret_ty.clone());
let inner_ty = self.infer_expr_coerce(*body, &Expectation::has_type(ret_ty));
self.diverges = prev_diverges;
self.return_ty = prev_ret_ty;
// Use the first type parameter as the output type of future.
// existential type AsyncBlockImplTrait<InnerType>: Future<Output = InnerType>
let inner_ty = self.infer_expr(*body, &Expectation::none());
let impl_trait_id = crate::ImplTraitId::AsyncBlockTypeImplTrait(self.owner, *body);
let opaque_ty_id = self.db.intern_impl_trait_id(impl_trait_id).into();
TyKind::OpaqueType(opaque_ty_id, Substitution::from1(Interner, inner_ty))