Add test for application with multiple type params

Author: Sporarum

tests/pos/_typeInterweaving/classless.scala

@@ -1,2 +1,4 @@
 def f1[T][U](x: T, y: U): (T, U) = (x, y)
-def f2[T](x: T)[U](y: U): (T, U) = (x, y)
+def f2[T](x: T)[U](y: U): (T, U) = (x, y)
+
+@main def test = f2(0)[String]("Hello")