Imported Upstream version 1.1~hg20130304upstream/1.1_hg20130304

1 files changed, 9 insertions, 3 deletions

diff --git a/src/pkg/encoding/gob/encoder.go b/src/pkg/encoding/gob/encoder.go
index a15b5a1f9..f669c3d5b 100644
--- a/src/pkg/encoding/gob/encoder.go
+++ b/src/pkg/encoding/gob/encoder.go
@@ -132,13 +132,13 @@ func (enc *Encoder) sendActualType(w io.Writer, state *encoderState, ut *userTyp
 	return true
 }
 
-// sendType sends the type info to the other side, if necessary. 
+// sendType sends the type info to the other side, if necessary.
 func (enc *Encoder) sendType(w io.Writer, state *encoderState, origt reflect.Type) (sent bool) {
 	ut := userType(origt)
 	if ut.isGobEncoder {
 		// The rules are different: regardless of the underlying type's representation,
-		// we need to tell the other side that this exact type is a GobEncoder.
-		return enc.sendActualType(w, state, ut, ut.user)
+		// we need to tell the other side that the base type is a GobEncoder.
+		return enc.sendActualType(w, state, ut, ut.base)
 	}
 
 	// It's a concrete value, so drill down to the base type.
@@ -218,6 +218,12 @@ func (enc *Encoder) sendTypeId(state *encoderState, ut *userTypeInfo) {
 // EncodeValue transmits the data item represented by the reflection value,
 // guaranteeing that all necessary type information has been transmitted first.
 func (enc *Encoder) EncodeValue(value reflect.Value) error {
+	// Gobs contain values. They cannot represent nil pointers, which
+	// have no value to encode.
+	if value.Kind() == reflect.Ptr && value.IsNil() {
+		panic("gob: cannot encode nil pointer of type " + value.Type().String())
+	}
+
 	// Make sure we're single-threaded through here, so multiple
 	// goroutines can share an encoder.
 	enc.mutex.Lock()