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 281601fbc767165467292611827a4ddf35e7859f..ccb5cfdb56d2ce992c805231161448b281613d96 100644 (file)
--- 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=");