deprecating types after colon

compiler/testData/diagnostics/tests/declarationChecks/kt2631_MultipleDeclaration.kt

@@ -1,3 +1,5 @@
+// !CHECK_TYPE
+
 //KT-2631 Check multiple assignment
 package a
 
@@ -12,14 +14,14 @@ fun MyClass2.component1() = 1.2
 
 fun test(mc1: MyClass, mc2: MyClass2) {
     val (a, b) = mc1
-    a : Int
-    b : String
+    checkSubtype<Int>(a)
+    checkSubtype<String>(b)
 
     val (c) = mc2
-    c : Double
+    checkSubtype<Double>(c)
 
     //check no error types
-    <!TYPE_MISMATCH!>a<!> : Boolean
-    <!TYPE_MISMATCH!>b<!> : Boolean
-    <!TYPE_MISMATCH!>c<!> : Boolean
+    checkSubtype<Boolean>(<!TYPE_MISMATCH!>a<!>)
+    checkSubtype<Boolean>(<!TYPE_MISMATCH!>b<!>)
+    checkSubtype<Boolean>(<!TYPE_MISMATCH!>c<!>)
 }