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Okay actually check only alias TYPES
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@ -435,12 +435,6 @@ impl<'a, 'tcx> WfPredicates<'a, 'tcx> {
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}
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}
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/// Pushes the obligations required for an alias (except inherent) to be WF
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/// into `self.out`.
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fn compute_alias_ty(&mut self, data: ty::AliasTy<'tcx>) {
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self.compute_alias_term(data.into());
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}
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/// Pushes the obligations required for an alias (except inherent) to be WF
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/// into `self.out`.
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fn compute_alias_term(&mut self, data: ty::AliasTerm<'tcx>) {
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@ -498,7 +492,7 @@ impl<'a, 'tcx> WfPredicates<'a, 'tcx> {
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self.out.extend(obligations);
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}
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self.compute_projection_args(data.args);
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data.args.visit_with(self);
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}
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fn compute_projection_args(&mut self, args: GenericArgsRef<'tcx>) {
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@ -702,8 +696,8 @@ impl<'a, 'tcx> TypeVisitor<TyCtxt<'tcx>> for WfPredicates<'a, 'tcx> {
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}
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ty::Alias(ty::Projection | ty::Opaque | ty::Weak, data) => {
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self.compute_alias_ty(data);
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return; // Subtree handled by compute_projection.
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let obligations = self.nominal_obligations(data.def_id, data.args);
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self.out.extend(obligations);
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}
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ty::Alias(ty::Inherent, data) => {
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self.compute_inherent_projection(data);
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8
tests/ui/higher-ranked/well-formed-aliases.rs
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8
tests/ui/higher-ranked/well-formed-aliases.rs
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@ -0,0 +1,8 @@
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trait Trait {
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type Gat<U: ?Sized>;
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}
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fn test<T>(f: for<'a> fn(<&'a T as Trait>::Gat<&'a [str]>)) where for<'a> &'a T: Trait {}
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//~^ ERROR the size for values of type `str` cannot be known at compilation time
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fn main() {}
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12
tests/ui/higher-ranked/well-formed-aliases.stderr
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12
tests/ui/higher-ranked/well-formed-aliases.stderr
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@ -0,0 +1,12 @@
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error[E0277]: the size for values of type `str` cannot be known at compilation time
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--> $DIR/well-formed-aliases.rs:5:52
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LL | fn test<T>(f: for<'a> fn(<&'a T as Trait>::Gat<&'a [str]>)) where for<'a> &'a T: Trait {}
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| ^^^^^ doesn't have a size known at compile-time
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= help: the trait `Sized` is not implemented for `str`
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= note: slice and array elements must have `Sized` type
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error: aborting due to 1 previous error
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For more information about this error, try `rustc --explain E0277`.
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