1996 repro

gistfile1.go

package main

import (
	"reflect"
)

func foo() func(int) {
	return nil
}

func main() {

	i := reflect.TypeOf(foo).Out(0).In(0)

	t := reflect.FuncOf([]reflect.Type{i}, nil, false)

	v := reflect.MakeFunc(t, func(in []reflect.Value) []reflect.Value {
		return nil
	})

	v.Interface().(func(int))(1)

}

panic: interface conversion: interface is func(int), not func(int)

goroutine 1 [running]:
main.main()
    /home/thomas/Go/repro.1996.go:21 +0x212
exit status 2