Elaborate trait assumption in receiver_is_dispatchable

Author: compiler-errors

compiler/rustc_trait_selection/src/traits/dyn_compatibility.rs

@@ -579,8 +579,8 @@ fn receiver_is_dispatchable<'tcx>(
     let unsized_receiver_ty =
         receiver_for_self_ty(tcx, receiver_ty, unsized_self_ty, method.def_id);
 
-    // create a modified param env, with `Self: Unsize<U>` and `U: Trait` added to caller bounds
-    // `U: ?Sized` is already implied here
+    // create a modified param env, with `Self: Unsize<U>` and `U: Trait` (and all of
+    // its supertraits) added to caller bounds. `U: ?Sized` is already implied here.
     let param_env = {
         let param_env = tcx.param_env(method.def_id);
 
@@ -598,8 +598,10 @@ fn receiver_is_dispatchable<'tcx>(
             ty::TraitRef::new_from_args(tcx, trait_def_id, args).upcast(tcx)
         };
 
-        let caller_bounds =
-            param_env.caller_bounds().iter().chain([unsize_predicate, trait_predicate]);
+        let caller_bounds = param_env
+            .caller_bounds()
+            .iter()
+            .chain(elaborate(tcx, [unsize_predicate, trait_predicate]));
 
         ty::ParamEnv::new(tcx.mk_clauses_from_iter(caller_bounds))
     };

tests/ui/self/dyn-dispatch-requires-supertrait.rs

@@ -0,0 +1,38 @@
+//@ check-pass
+
+#![feature(derive_coerce_pointee)]
+#![feature(arbitrary_self_types)]
+
+use std::ops::Deref;
+use std::marker::CoercePointee;
+use std::sync::Arc;
+
+trait MyTrait {}
+
+#[derive(CoercePointee)]
+#[repr(transparent)]
+struct MyArc<T>
+where
+    T: MyTrait + ?Sized,
+{
+    inner: Arc<T>
+}
+
+impl<T: MyTrait + ?Sized> Deref for MyArc<T> {
+    type Target = T;
+    fn deref(&self) -> &T {
+        &self.inner
+    }
+}
+
+// Proving that `MyArc<Self>` is dyn-dispatchable requires proving `MyArc<T>` implements
+// `DispatchFromDyn<MyArc<U>>`. The `DispatchFromDyn` impl that is generated from the
+// `CoercePointee` implementation requires the pointee impls `MyTrait`, but previously we
+// were only assuming the pointee impl'd `MyOtherTrait`. Elaboration comes to the rescue here.
+trait MyOtherTrait: MyTrait {
+    fn foo(self: MyArc<Self>);
+}
+
+fn test(_: MyArc<dyn MyOtherTrait>) {}
+
+fn main() {}