From 124e603d87b94159e6750e9f7c1d9beb5a80a9a6 Mon Sep 17 00:00:00 2001
From: Robert Griesemer <gri@golang.org>
Date: Mon, 24 Jun 2013 17:38:41 -0700
Subject: [PATCH] go.tools/go/types: imported structs may contain _ fields

Don't report import errors due to (multiple) _ fields
in imported structs.

Fixes golang/go#5758.

R=adonovan
CC=golang-dev
https://golang.org/cl/10529043
---
 go/types/gcimporter.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/go/types/gcimporter.go b/go/types/gcimporter.go
index 3527587a..2ca0fd20 100644
--- a/go/types/gcimporter.go
+++ b/go/types/gcimporter.go
@@ -506,7 +506,10 @@ func (p *gcParser) parseStructType() Type {
 		if tags != nil {
 			tags = append(tags, tag)
 		}
-		if alt := scope.Insert(fld); alt != nil {
+		if fld.name == "_" {
+			// blank identifiers are not declared
+			fld.setParent(scope)
+		} else if alt := scope.Insert(fld); alt != nil {
 			pname := "<no pkg name>"
 			if pkg := alt.Pkg(); pkg != nil {
 				pname = pkg.name