deprecating types after colon

compiler/testData/diagnostics/tests/cast/bare/ErrorsInSubstitution.kt

@@ -1,7 +1,9 @@
+// !CHECK_TYPE
+
 trait B<T>
 trait G<T>: B<T>
 
 fun f(p: B<<!UNRESOLVED_REFERENCE!>Foo<!>>): Any {
     val v = <!DEBUG_INFO_ELEMENT_WITH_ERROR_TYPE!>p<!> as G
-    return <!DEBUG_INFO_ELEMENT_WITH_ERROR_TYPE!>v<!>: G<*>
+    return checkSubtype<G<*>>(<!DEBUG_INFO_ELEMENT_WITH_ERROR_TYPE!>v<!>)
 }