GreatSyntacticShift: Syntax for function types, function literals, when and tuples

Bug:
fun loop(var times : Int) {
   while(times > 0) {
        val u : (value : Int) -> Unit = { // This arrow is confusing the lookahead
            System.out?.println(it)
        }
        u(times--)
   }
}

compiler/testData/diagnostics/tests/Casts.jet

@@ -12,5 +12,5 @@ fun test() : Unit {
   y <!USELESS_CAST!>as?<!> Int : Int?
   x <!USELESS_CAST!>as?<!> Int? : Int?
   y <!USELESS_CAST_STATIC_ASSERT_IS_FINE!>as?<!> Int? : Int?
-  ()
+  #()
 }