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

diff --git a/src/pkg/reflect/value.go b/src/pkg/reflect/value.go
index 82985c5751a9e97a77728b1f42e684acf857bef4..87d12bb0b715a9de687f7938b77ab010bb57ffd8 100644 (file)
--- 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")
        }