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Don't ICE when encountering bound var in builtin copy/clone bounds

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This commit is contained in:
Michael Goulet 2023-03-04 17:53:31 +00:00
parent b583ede652
commit 32f1f01499
3 changed files with 39 additions and 5 deletions
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11
compiler/rustc_trait_selection/src/traits/select/mod.rs
View File

@ -2149,7 +2149,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
ty::Alias(..) | ty::Param(_) | ty::Placeholder(..) => None,
ty::Infer(ty::TyVar(_)) => Ambiguous,
// We can make this an ICE if/once we actually instantiate the trait obligation.
// We can make this an ICE if/once we actually instantiate the trait obligation eagerly.
ty::Bound(..) => None,
ty::Infer(ty::FreshTy(_) | ty::FreshIntTy(_) | ty::FreshFloatTy(_)) => {
@ -2257,7 +2257,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
}
}
ty::Adt(..) | ty::Alias(..) | ty::Param(..) => {
ty::Adt(..) | ty::Alias(..) | ty::Param(..) | ty::Placeholder(..) => {
// Fallback to whatever user-defined impls exist in this case.
None
}
@ -2269,9 +2269,10 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
Ambiguous
}
ty::Placeholder(..)
| ty::Bound(..)
| ty::Infer(ty::FreshTy(_) | ty::FreshIntTy(_) | ty::FreshFloatTy(_)) => {
// We can make this an ICE if/once we actually instantiate the trait obligation eagerly.
ty::Bound(..) => None,
ty::Infer(ty::FreshTy(_) | ty::FreshIntTy(_) | ty::FreshFloatTy(_)) => {
bug!("asked to assemble builtin bounds of unexpected type: {:?}", self_ty);
}
}

9
tests/ui/traits/non_lifetime_binders/bad-copy-cond.rs Normal file
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@ -0,0 +1,9 @@
#![feature(non_lifetime_binders)]
//~^ WARN the feature `non_lifetime_binders` is incomplete
fn foo() where for<T> T: Copy {}
fn main() {
foo();
//~^ ERROR the trait bound `T: Copy` is not satisfied
}

24
tests/ui/traits/non_lifetime_binders/bad-copy-cond.stderr Normal file
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@ -0,0 +1,24 @@
warning: the feature `non_lifetime_binders` is incomplete and may not be safe to use and/or cause compiler crashes
--> $DIR/bad-copy-cond.rs:1:12
|
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
error[E0277]: the trait bound `T: Copy` is not satisfied
--> $DIR/bad-copy-cond.rs:7:5
|
LL | foo();
| ^^^ the trait `Copy` is not implemented for `T`
|
note: required by a bound in `foo`
--> $DIR/bad-copy-cond.rs:4:26
|
LL | fn foo() where for<T> T: Copy {}
| ^^^^ required by this bound in `foo`
error: aborting due to previous error; 1 warning emitted
For more information about this error, try `rustc --explain E0277`.