From a2bb0159d6442ce03f5a1f2bbc636a2f526e004a Mon Sep 17 00:00:00 2001
From: Gustavo Niemeyer <gustavo@niemeyer.net>
Date: Mon, 15 Aug 2011 14:14:15 -0300
Subject: [PATCH] reflect: panic on Invalid Interface call

This was initially pushed as part of CL 4876046, found
when logic in exp/template was using the method on
an Invalid value.

R=rsc
CC=golang-dev
https://golang.org/cl/4890043
---
 src/pkg/reflect/value.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/pkg/reflect/value.go b/src/pkg/reflect/value.go
index 82985c5751..87d12bb0b7 100644
--- a/src/pkg/reflect/value.go
+++ b/src/pkg/reflect/value.go
@@ -860,6 +860,9 @@ func (v Value) Interface() interface{} {
 }
 
 func (iv internalValue) Interface() interface{} {
+	if iv.kind == 0 {
+		panic(&ValueError{"reflect.Value.Interface", iv.kind})
+	}
 	if iv.method {
 		panic("reflect.Value.Interface: cannot create interface value for method with bound receiver")
 	}
-- 
2.50.0