deprecating types after colon

compiler/testData/diagnostics/tests/dataClasses/secondParamIsVar.kt

@@ -1,6 +1,8 @@
+// !CHECK_TYPE
+
 data class A(<!UNUSED_PARAMETER!>x<!>: Int, var y: String)
 
 fun foo(a: A) {
-    a.component1() : String
+    checkSubtype<String>(a.component1())
     a.<!UNRESOLVED_REFERENCE!>component2<!>()
 }