deprecating types after colon

compiler/testData/diagnostics/testsWithStdLib/callableReference/function/topLevelFromTopLevel.kt

@@ -1,3 +1,5 @@
+// !CHECK_TYPE
+
 import kotlin.reflect.*
 
 fun foo() {}
@@ -9,7 +11,7 @@ fun main() {
     val y = ::bar
     val z = ::baz
 
-    x : KFunction0<Unit>
-    y : KFunction1<Int, Unit>
-    z : KFunction0<String>
+    checkSubtype<KFunction0<Unit>>(x)
+    checkSubtype<KFunction1<Int, Unit>>(y)
+    checkSubtype<KFunction0<String>>(z)
 }