compiler/lang: add variadic function args support

compiler/tests/fn_test.v

@@ -56,13 +56,6 @@ type actionf_p1 fn (voidptr)
 
 type actionf_p2 fn (voidptr, voidptr)
 
-fn myprint(s string, ..) {
-	println('my print')
-	println('// comment')
-	println('/* comment */')
-	println('/* /* comment */ */')
-}
-
 // TODO
 fn modify_array(a mut []int) {
 	a[0] = 10

compiler/tests/fn_variadic_test.v

@@ -0,0 +1,15 @@
+struct VaTestGroup {
+	name string
+}
+
+fn variadic_test_a(name string, groups ...VaTestGroup) {
+	assert groups.len == 2
+	assert groups[0].name == 'users' 
+	assert groups[1].name == 'admins'
+}
+
+fn test_fn_variadic() {
+	group1 := VaTestGroup{name: 'users'}
+	group2 := VaTestGroup{name: 'admins'}
+	variadic_test_a('joe', group1, group2)
+}