deprecating types after colon

compiler/testData/diagnostics/tests/dataFlowInfoTraversal/BinaryExpressionPlusConvention.kt

@@ -1,3 +1,5 @@
+// !CHECK_TYPE
+
 trait A
 
 trait B : A
@@ -5,12 +7,12 @@ fun B.plus(b: B) = if (this == b) b else this
 
 fun foo(a: A): B {
     val result = (a as B) + <!DEBUG_INFO_SMARTCAST!>a<!>
-    <!DEBUG_INFO_SMARTCAST!>a<!> : B
+    checkSubtype<B>(<!DEBUG_INFO_SMARTCAST!>a<!>)
     return result
 }
 
 fun bar(a: A, b: B): B {
     val result = b + (a as B)
-    <!DEBUG_INFO_SMARTCAST!>a<!> : B
+    checkSubtype<B>(<!DEBUG_INFO_SMARTCAST!>a<!>)
     return result
 }