non-pkg: gofix -r error -force=error

R=golang-dev, iant, r, r
CC=golang-dev
https://golang.org/cl/5307066

test/recover3.go

diff --git a/test/recover3.go b/test/recover3.go
index 2aa1df6..60ade9b 100644
--- a/test/recover3.go
+++ b/test/recover3.go
@@ -35,7 +35,7 @@
 			println(name, "panicked but not with runtime.Error")
 			return
 		}
-		s := runt.String()
+		s := runt.Error()
 		if strings.Index(s, err) < 0 {
 			bug()
 			println(name, "panicked with", s, "not", err)