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Support overloaded deref MIR lowering

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This commit is contained in:
hkalbasi 2023-03-17 14:02:55 +03:30
parent 9564773d5e
commit eb4939e217
18 changed files with 398 additions and 86 deletions
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47
crates/hir-ty/src/infer/expr.rs
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@ -390,14 +390,28 @@ impl<'a> InferenceContext<'a> {
if let Some(fn_x) = func {
match fn_x {
FnTrait::FnOnce => (),
FnTrait::FnMut => adjustments.push(Adjustment::borrow(
Mutability::Mut,
derefed_callee.clone(),
)),
FnTrait::Fn => adjustments.push(Adjustment::borrow(
Mutability::Not,
derefed_callee.clone(),
)),
FnTrait::FnMut => {
if !matches!(
derefed_callee.kind(Interner),
TyKind::Ref(Mutability::Mut, _, _)
) {
adjustments.push(Adjustment::borrow(
Mutability::Mut,
derefed_callee.clone(),
));
}
}
FnTrait::Fn => {
if !matches!(
derefed_callee.kind(Interner),
TyKind::Ref(Mutability::Not, _, _)
) {
adjustments.push(Adjustment::borrow(
Mutability::Not,
derefed_callee.clone(),
));
}
}
}
let trait_ = fn_x
.get_id(self.db, self.trait_env.krate)
@ -673,6 +687,23 @@ impl<'a> InferenceContext<'a> {
// FIXME: Note down method resolution her
match op {
UnaryOp::Deref => {
if let Some(deref_trait) = self
.db
.lang_item(self.table.trait_env.krate, LangItem::Deref)
.and_then(|l| l.as_trait())
{
if let Some(deref_fn) =
self.db.trait_data(deref_trait).method_by_name(&name![deref])
{
// FIXME: this is wrong in multiple ways, subst is empty, and we emit it even for builtin deref (note that
// the mutability is not wrong, and will be fixed in `self.infer_mut`).
self.write_method_resolution(
tgt_expr,
deref_fn,
Substitution::empty(Interner),
);
}
}
autoderef::deref(&mut self.table, inner_ty).unwrap_or_else(|| self.err_ty())
}
UnaryOp::Neg => {