deprecating types after colon

compiler/testData/diagnostics/tests/GenericFunctionIsLessSpecific.kt

@@ -1,8 +1,10 @@
+// !CHECK_TYPE
+
 // A generic funciton is always less specific than a non-generic one
 fun foo<T>(<!UNUSED_PARAMETER!>t<!> : T) : Unit {}
 fun foo(<!UNUSED_PARAMETER!>i<!> : Int) : Int = 1
 
 fun test() {
-    foo(1) : Int
-    foo("s") : Unit
+    checkSubtype<Int>(foo(1))
+    checkSubtype<Unit>(foo("s"))
 }