This libgo patch fixes the time test for systems that using the recent
tzdata-2016g update, which added a new zone abbreviation.
Bootstrapped and ran time test on x86_64-pc-linux-gnu.  Committed to
mainline and GCC 6 branch.

Ian
Index: gcc/go/gofrontend/MERGE
===================================================================
--- gcc/go/gofrontend/MERGE     (revision 241659)
+++ gcc/go/gofrontend/MERGE     (working copy)
@@ -1,4 +1,4 @@
-4a8df8f8622c140777996786866395448622ac3f
+5ddcdfb0b2bb992a70b391ab34bf15291a514e48
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.
Index: libgo/go/time/time_test.go
===================================================================
--- libgo/go/time/time_test.go  (revision 241341)
+++ libgo/go/time/time_test.go  (working copy)
@@ -939,8 +939,11 @@ func TestLoadFixed(t *testing.T) {
        // but Go and most other systems use "east is positive".
        // So GMT+1 corresponds to -3600 in the Go zone, not +3600.
        name, offset := Now().In(loc).Zone()
-       if name != "GMT+1" || offset != -1*60*60 {
-               t.Errorf("Now().In(loc).Zone() = %q, %d, want %q, %d", name, 
offset, "GMT+1", -1*60*60)
+       // The zone abbreviation is "-01" since tzdata-2016g, and "GMT+1"
+       // on earlier versions; we accept both. (Issue #17276).
+       if !(name == "GMT+1" || name == "-01") || offset != -1*60*60 {
+               t.Errorf("Now().In(loc).Zone() = %q, %d, want %q or %q, %d",
+                       name, offset, "GMT+1", "-01", -1*60*60)
        }
 }
 

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