}
if let ast::FunctionRetTy::Ty(ref ret_ty) = decl.output {
- v.visit_ty(&ret_ty);
+ if let ast::TyKind::ImplTrait(..) = ret_ty.node {
+ // FIXME: Opaque type desugaring prevents us from easily
+ // processing trait bounds. See `visit_ty` for more details.
+ } else {
+ v.visit_ty(&ret_ty);
+ }
}
v.visit_block(&body);
self.visit_ty(element);
self.nest_tables(length.id, |v| v.visit_expr(&length.value));
}
+ ast::TyKind::ImplTrait(id, ref bounds) => {
+ // FIXME: As of writing, the opaque type lowering introduces
+ // another DefPath scope/segment (used to declare the resulting
+ // opaque type item).
+ // However, the synthetic scope does *not* have associated
+ // typeck tables, which means we can't nest it and we fire an
+ // assertion when resolving the qualified type paths in trait
+ // bounds...
+ // This will panic if called on return type `impl Trait`, which
+ // we guard against in `process_fn`.
+ self.nest_tables(id, |v| v.process_bounds(bounds));
+ }
_ => visit::walk_ty(self, t),
}
}
// check-pass
// compile-flags: -Zsave-analysis
-// Check that this doesn't ICE when processing associated const in formal
-// argument and return type of functions defined inside function/method scope.
-
pub trait Trait {
type Assoc;
}
pub struct A;
+trait Generic<T> {}
+impl<T> Generic<T> for () {}
+
+// Don't ICE when resolving type paths in return type `impl Trait`
+fn assoc_in_opaque_type_bounds<U: Trait>() -> impl Generic<U::Assoc> {}
+
+// Check that this doesn't ICE when processing associated const in formal
+// argument and return type of functions defined inside function/method scope.
pub fn func() {
fn _inner1<U: Trait>(_: U::Assoc) {}
fn _inner2<U: Trait>() -> U::Assoc { unimplemented!() }