From: Ken Thompson <ken@golang.org>
Date: Tue, 23 Mar 2010 20:00:02 +0000 (-0700)
Subject: maps access to a missing key
X-Git-Tag: weekly.2010-03-30~85
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=e781303e271cd2c062d7e834927210ad529e4d7d;p=gostls13.git

maps access to a missing key
will return the "zero" value

R=rsc
CC=golang-dev
https://golang.org/cl/700041
---

diff --git a/src/pkg/runtime/hashmap.c b/src/pkg/runtime/hashmap.c
index 281601fbc7..ccb5cfdb56 100644
--- a/src/pkg/runtime/hashmap.c
+++ b/src/pkg/runtime/hashmap.c
@@ -769,8 +769,10 @@ void
 	av = (byte*)&h + h->vo1;
 
 	mapaccess(h, ak, av, &pres);
-	if(!pres)
-		throw("runtime.mapaccess1: key not in map");
+
+// new spec -- all elements have "zero" value
+//	if(!pres)
+//		throw("runtime.mapaccess1: key not in map");
 
 	if(debug) {
 		prints("runtime.mapaccess1: map=");