gc: remove interim ... error which rejects valid code.

It's been six months.

R=rsc
CC=golang-dev
https://golang.org/cl/4289073
diff --git a/test/fixedbugs/bug252.go b/test/fixedbugs/bug252.go
index 5615f84..a2c1dab 100644
--- a/test/fixedbugs/bug252.go
+++ b/test/fixedbugs/bug252.go
@@ -7,9 +7,9 @@
 package main
 
 func f(args ...int) {
-	g(args)	// ERROR "[.][.][.]"
+	g(args)
 }
 
 func g(args ...interface{}) {
-	f(args)	// ERROR "[.][.][.]"
+	f(args)	// ERROR "cannot use|incompatible"
 }