cmd/api: add missing runtime struct

Fixes build.

TBR=khr
R=golang-codereviews
CC=golang-codereviews, khr
https://codereview.appspot.com/130390044

1 files changed, 1 insertions, 1 deletions

diff --git a/src/cmd/api/goapi.go b/src/cmd/api/goapi.go
index e0d17c956..5933f3256 100644
--- a/src/cmd/api/goapi.go
+++ b/src/cmd/api/goapi.go
@@ -381,7 +381,7 @@ func (w *Walker) parseFile(dir, file string) (*ast.File, error) {
 		src := "package runtime; type maptype struct{}; type _type struct{}; type alg struct{};" +
 			" type mspan struct{}; type m struct{}; type lock struct{}; type slicetype struct{};" +
 			" type iface struct{}; type eface struct{}; type interfacetype struct{}; type itab struct{};" +
-			" type mcache struct{}"
+			" type mcache struct{}; type bucket struct{}"
 		f, err = parser.ParseFile(fset, filename, src, 0)
 		if err != nil {
 			log.Fatalf("incorrect generated file: %s", err)