remove uses of ... from tree, add one test

R=r
CC=golang-dev
https://golang.org/cl/1662041
diff --git a/test/fixedbugs/bug252.go b/test/fixedbugs/bug252.go
index 7ed8b87..bd11b86 100644
--- a/test/fixedbugs/bug252.go
+++ b/test/fixedbugs/bug252.go
@@ -6,7 +6,7 @@
 
 package main
 
-func f(args ...) {
+func f(args ...int) {
 	g(args)	// ERROR "[.][.][.] mismatch"
 }