diff options
3 files changed, 39 insertions, 5 deletions
diff --git a/compiler/rustc_trait_selection/src/traits/select/mod.rs b/compiler/rustc_trait_selection/src/traits/select/mod.rs index 01c1ad3a4ce..63ab8cf8db7 100644 --- a/compiler/rustc_trait_selection/src/traits/select/mod.rs +++ b/compiler/rustc_trait_selection/src/traits/select/mod.rs @@ -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); } } diff --git a/tests/ui/traits/non_lifetime_binders/bad-copy-cond.rs b/tests/ui/traits/non_lifetime_binders/bad-copy-cond.rs new file mode 100644 index 00000000000..506cad25f63 --- /dev/null +++ b/tests/ui/traits/non_lifetime_binders/bad-copy-cond.rs @@ -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 +} diff --git a/tests/ui/traits/non_lifetime_binders/bad-copy-cond.stderr b/tests/ui/traits/non_lifetime_binders/bad-copy-cond.stderr new file mode 100644 index 00000000000..07e02d47f27 --- /dev/null +++ b/tests/ui/traits/non_lifetime_binders/bad-copy-cond.stderr @@ -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`. |