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Rollup merge of #114876 - compiler-errors:non-lifetime-binders-sized, r=wesleywiser 

Don't ICE in `is_trivially_sized` when encountering late-bound self ty

We can see a bound ty var here:
b531630f42/compiler/rustc_trait_selection/src/traits/query/type_op/prove_predicate.rs (L13-L34)

Fixes #114872
This commit is contained in:
Matthias Krüger 2023-08-17 08:39:21 +02:00 committed by GitHub
parent f4cd7a537b c31aedf47f
commit 084c87dfea
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 32 additions and 2 deletions
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4
compiler/rustc_middle/src/ty/sty.rs
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@ -2827,11 +2827,11 @@ impl<'tcx> Ty<'tcx> {
ty::Adt(def, _args) => def.sized_constraint(tcx).skip_binder().is_empty(),
ty::Alias(..) | ty::Param(_) | ty::Placeholder(..) => false,
ty::Alias(..) | ty::Param(_) | ty::Placeholder(..) | ty::Bound(..) => false,
ty::Infer(ty::TyVar(_)) => false,
ty::Bound(..) | ty::Infer(ty::FreshTy(_) | ty::FreshIntTy(_) | ty::FreshFloatTy(_)) => {
ty::Infer(ty::FreshTy(_) | ty::FreshIntTy(_) | ty::FreshFloatTy(_)) => {
bug!("`is_trivially_sized` applied to unexpected type: {:?}", self)
}
}

19
tests/ui/traits/non_lifetime_binders/sized-late-bound-issue-114872.rs Normal file
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@ -0,0 +1,19 @@
// check-pass
#![feature(non_lifetime_binders)]
//~^ WARN is incomplete and may not be safe
pub fn foo()
where
for<V> V: Sized,
{
bar();
}
pub fn bar()
where
for<V> V: Sized,
{
}
pub fn main() {}

11
tests/ui/traits/non_lifetime_binders/sized-late-bound-issue-114872.stderr Normal file
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@ -0,0 +1,11 @@
warning: the feature `non_lifetime_binders` is incomplete and may not be safe to use and/or cause compiler crashes
--> $DIR/sized-late-bound-issue-114872.rs:3:12
|
LL | #![feature(non_lifetime_binders)]
| ^^^^^^^^^^^^^^^^^^^^
|
= note: see issue #108185 <https://github.com/rust-lang/rust/issues/108185> for more information
= note: `#[warn(incomplete_features)]` on by default
warning: 1 warning emitted