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Implement try{} block type inference

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Maybe Waffle 2022-12-28 21:25:47 +00:00
parent ef303f224f
commit aaa682c534
2 changed files with 27 additions and 18 deletions
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17
crates/hir-ty/src/infer/expr.rs
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@ -152,11 +152,20 @@ impl<'a> InferenceContext<'a> {
.1
}
Expr::TryBlock { body } => {
self.with_breakable_ctx(BreakableKind::Block, self.err_ty(), None, |this| {
let _inner = this.infer_expr(*body, expected);
// The type that is returned from the try block
let try_ty = self.table.new_type_var();
if let Some(ty) = expected.only_has_type(&mut self.table) {
self.unify(&try_ty, &ty);
}
// The ok-ish type that is expected from the last expression
let ok_ty = self.resolve_associated_type(try_ty.clone(), self.resolve_ops_try_ok());
self.with_breakable_ctx(BreakableKind::Block, ok_ty.clone(), None, |this| {
this.infer_expr(*body, &Expectation::has_type(ok_ty));
});
// FIXME should be std::result::Result<{inner}, _>
self.err_ty()
try_ty
}
Expr::Async { body } => {
let ret_ty = self.table.new_type_var();