Further tweak wording of E0759 and introduce E0767

src/test/ui/suggestions/impl-on-dyn-trait-with-implicit-static-bound.rs

@@ -17,7 +17,7 @@ mod foo {
     impl Irrelevant for dyn ObjectTrait {}
 
     fn use_it<'a>(val: &'a dyn ObjectTrait) -> impl OtherTrait<'a> + 'a {
-        val.use_self() //~ ERROR cannot infer an appropriate lifetime
+        val.use_self() //~ ERROR E0759
     }
 }
 
@@ -34,7 +34,7 @@ mod bar {
     impl Irrelevant for dyn ObjectTrait {}
 
     fn use_it<'a>(val: &'a dyn ObjectTrait) -> &'a () {
-        val.use_self() //~ ERROR cannot infer an appropriate lifetime
+        val.use_self() //~ ERROR E0767
     }
 }
 
@@ -51,7 +51,7 @@ mod baz {
     impl Irrelevant for Box<dyn ObjectTrait> {}
 
     fn use_it<'a>(val: &'a Box<dyn ObjectTrait + 'a>) -> &'a () {
-        val.use_self() //~ ERROR cannot infer an appropriate lifetime
+        val.use_self() //~ ERROR E0767
     }
 }
 
@@ -66,8 +66,29 @@ mod bat {
     }
 
     fn use_it<'a>(val: &'a dyn ObjectTrait) -> impl OtherTrait<'a> + 'a {
-        val.use_self() //~ ERROR cannot infer an appropriate lifetime
+        val.use_self() //~ ERROR E0767
     }
 }
 
+mod ban {
+    trait OtherTrait<'a> {}
+    impl<'a> OtherTrait<'a> for &'a () {}
+
+    trait ObjectTrait {}
+    trait MyTrait {
+        fn use_self(&self) -> &();
+    }
+    trait Irrelevant {}
+
+    impl MyTrait for dyn ObjectTrait {
+        fn use_self(&self) -> &() { panic!() }
+    }
+    impl Irrelevant for dyn ObjectTrait {}
+
+    fn use_it<'a>(val: &'a dyn ObjectTrait) -> impl OtherTrait<'a> {
+        val.use_self() //~ ERROR E0759
+    }
+}
+
+
 fn main() {}