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Do not suggest "is a function" for free variables

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Part of #82323
This commit is contained in:
Michael Howell 2022-02-13 13:06:06 -07:00
parent 05d1652337
commit 65fc7058d8
5 changed files with 106 additions and 0 deletions
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12
compiler/rustc_typeck/src/check/method/suggest.rs
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@ -40,7 +40,19 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
Err(..) => return false,
};
// This conditional prevents us from asking to call errors and unresolved types.
// It might seem that we can use `predicate_must_hold_modulo_regions`,
// but since a Dummy binder is used to fill in the FnOnce trait's arguments,
// type resolution always gives a "maybe" here.
if self.autoderef(span, ty).any(|(ty, _)| {
info!("check deref {:?} error", ty);
matches!(ty.kind(), ty::Error(_) | ty::Infer(_))
}) {
return false;
}
self.autoderef(span, ty).any(|(ty, _)| {
info!("check deref {:?} impl FnOnce", ty);
self.probe(|_| {
let fn_once_substs = tcx.mk_substs_trait(
ty,