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Rollup merge of #99580 - fmease:fix-issue-99565, r=estebank

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Don't suggest unnameable generic arguments

Fixes #99565.

`@rustbot` label T-compiler A-diagnostics
r? `@rust-lang/wg-diagnostics`
This commit is contained in:
Matthias Krüger 2022-07-23 12:08:11 +02:00 • committed by GitHub
commit b6d6f100a1
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12 changed files with 90 additions and 22 deletions
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6
compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs
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@ -378,7 +378,7 @@ fn suggest_restriction<'tcx>(
replace_ty: ty::ParamTy::new(generics.count() as u32, Symbol::intern(&type_param_name))
.to_ty(tcx),
});
if !trait_pred.is_suggestable(tcx) {
if !trait_pred.is_suggestable(tcx, false) {
return;
}
// We know we have an `impl Trait` that doesn't satisfy a required projection.
@ -417,7 +417,7 @@ fn suggest_restriction<'tcx>(
Applicability::MaybeIncorrect,
);
} else {
if !trait_pred.is_suggestable(tcx) {
if !trait_pred.is_suggestable(tcx, false) {
return;
}
// Trivial case: `T` needs an extra bound: `T: Bound`.
@ -586,7 +586,7 @@ impl<'a, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'a, 'tcx> {
// else in the predicate.
if !trait_pred.skip_binder().trait_ref.substs[1..]
.iter()
.all(|g| g.is_suggestable(self.tcx))
.all(|g| g.is_suggestable(self.tcx, false))
{
return;
}