From f0964a54fb94a5dd9b237570646dbc38faef4d66 Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@golang.org>
Date: Thu, 24 Sep 2009 01:37:27 -0700
Subject: [PATCH] go/printer: fix sync bug - avoid sending on errors twice - 
 and report node type in error

R=gri
DELTA=4  (3 added, 0 deleted, 1 changed)
OCL=34949
CL=34955
---
 src/pkg/go/printer/printer.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/pkg/go/printer/printer.go b/src/pkg/go/printer/printer.go
index 4fdb2af342..3c9f32405c 100644
--- a/src/pkg/go/printer/printer.go
+++ b/src/pkg/go/printer/printer.go
@@ -14,6 +14,7 @@ import (
 	"io";
 	"os";
 	"reflect";
+	"runtime";
 	"strings";
 	"tabwriter";
 )
@@ -105,6 +106,7 @@ func (p *printer) write0(data []byte) {
 	p.written += n;
 	if err != nil {
 		p.errors <- err;
+		runtime.Goexit();
 	}
 }
 
@@ -1402,7 +1404,8 @@ func Fprint(output io.Writer, node interface{}, mode uint, tabwidth int) (int, o
 			p.comment = n.Comments;
 			p.file(n);
 		default:
-			p.errors <- os.NewError("unsupported node type");
+			p.errors <- os.NewError(fmt.Sprintf("unsupported node type %T", n));
+			runtime.Goexit();
 		}
 		p.flush(inf);
 		p.errors <- nil;  // no errors