From f13ba7892045b73661c82cb621d32f97b29694c9 Mon Sep 17 00:00:00 2001
From: Alan Donovan <adonovan@google.com>
Date: Thu, 14 Aug 2014 12:10:34 -0400
Subject: [PATCH] go.tools/go/loader: make error message for massive failure
 (e.g. no "fmt") more concise.

LGTM=gri
R=gri
CC=golang-codereviews
https://golang.org/cl/126080043
---
 go/loader/loader.go | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/go/loader/loader.go b/go/loader/loader.go
index 3800389f..d495105a 100644
--- a/go/loader/loader.go
+++ b/go/loader/loader.go
@@ -604,8 +604,13 @@ func (conf *Config) Load() (*Program, error) {
 			}
 		}
 		if errpkgs != nil {
-			return nil, fmt.Errorf("couldn't load packages due to errors: %s",
-				strings.Join(errpkgs, ", "))
+			var more string
+			if len(errpkgs) > 3 {
+				more = fmt.Sprintf(" and %d more", len(errpkgs)-3)
+				errpkgs = errpkgs[:3]
+			}
+			return nil, fmt.Errorf("couldn't load packages due to errors: %s%s",
+				strings.Join(errpkgs, ", "), more)
 		}
 	}