KT-1360 Vararg bug in front-end

compiler/testData/diagnostics/tests/varargs/varargsAndFunctionLiterals.kt

@@ -0,0 +1,13 @@
+fun f(vararg <!UNUSED_PARAMETER!>t<!> : Int, <!UNUSED_PARAMETER!>f<!> : ()->Unit) {
+}
+
+fun test() {
+    f {}
+    f() {}
+    f(1) {
+
+    }
+    f(1, 2) {
+
+    }
+}