Forbid callable references to members and extensions with empty LHS

This syntax is reserved to be likely used in the future as a shorthand for
"this::foo" where the resulting expression doesn't take the receiver as a
parameter but has "this" already bound to it

compiler/testData/repl/reflection/propertyReference.repl

@@ -1,6 +0,0 @@
->>> val foo = "REPL"
->>> ::foo.name
-foo
->>> ::
-... foo.name
-foo