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Call implementations of the Fn* traits on references #137252

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Call implementations of the Fn* traits on references #137252

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4c56758
Update callee.rs
mikem8891 Feb 19, 2025
d97eaf8
Update callee.rs
mikem8891 Feb 19, 2025
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11 changes: 8 additions & 3 deletions compiler/rustc_hir_typeck/src/callee.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -223,9 +223,14 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
// ^ without this hack `f` would have to be declared as mutable
//
// The simplest fix by far is to just ignore this case and deref again,
// so we wind up with `FnMut::call_mut(&mut *f, ())`.
ty::Ref(..) if autoderef.step_count() == 0 => {
return None;
// so we wind up with `FnMut::call_mut(&mut *f, ())`. This does not
// apply to structs, enums, or unions; because they should be `mut`
// if they use `call_mut()`.
ty::Ref(_, deref_ty, _) if autoderef.step_count() == 0 => {
match deref_ty.kind() {
ty::Adt(..) => {}
_ => return None,
};
}

ty::Error(_) => {
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