type-alias-enum-variants-priority-3: describe the test.

src/test/ui/type-alias-enum-variants/type-alias-enum-variants-priority-3.rs

@@ -1,3 +1,6 @@
+// Check that the compiler will resolve `<E>::V` to the variant `V` in the type namespace
+// but will reject this because `enum` variants do not exist in the type namespace.
+
 enum E {
     V
 }

src/test/ui/type-alias-enum-variants/type-alias-enum-variants-priority-3.stderr

@@ -1,5 +1,5 @@
 error: expected type, found variant `V`
-  --> $DIR/type-alias-enum-variants-priority-3.rs:5:15
+  --> $DIR/type-alias-enum-variants-priority-3.rs:8:15
    |
 LL | fn check() -> <E>::V {}
    |               ^^^^^^