libgo: update to Go 1.8 release candidate 1

    
    Compiler changes:
      * Change map assignment to use mapassign and assign value directly.
      * Change string iteration to use decoderune, faster for ASCII strings.
      * Change makeslice to take int, and use makeslice64 for larger values.
      * Add new noverflow field to hmap struct used for maps.
    
    Unresolved problems, to be fixed later:
      * Commented out test in go/types/sizes_test.go that doesn't compile.
      * Commented out reflect.TestStructOf test for padding after zero-sized field.
    
    Reviewed-on: https://go-review.googlesource.com/35231

gotools/:
	Updates for Go 1.8rc1.
	* Makefile.am (go_cmd_go_files): Add bug.go.
	(s-zdefaultcc): Write defaultPkgConfig.
	* Makefile.in: Rebuild.

From-SVN: r244456

1 files changed, 5 insertions, 1 deletions

diff --git a/libgo/go/math/big/intmarsh.go b/libgo/go/math/big/intmarsh.go
index 4ff57b6464e..ee1e4143ed9 100644
--- a/libgo/go/math/big/intmarsh.go
+++ b/libgo/go/math/big/intmarsh.go
@@ -59,7 +59,7 @@ func (z *Int) UnmarshalText(text []byte) error {
 	return nil
 }
 
-// The JSON marshallers are only here for API backward compatibility
+// The JSON marshalers are only here for API backward compatibility
 // (programs that explicitly look for these two methods). JSON works
 // fine with the TextMarshaler only.
 
@@ -70,5 +70,9 @@ func (x *Int) MarshalJSON() ([]byte, error) {
 
 // UnmarshalJSON implements the json.Unmarshaler interface.
 func (z *Int) UnmarshalJSON(text []byte) error {
+	// Ignore null, like in the main JSON package.
+	if string(text) == "null" {
+		return nil
+	}
 	return z.UnmarshalText(text)
 }