// $G $D/$F.go// Copyright 2009 The Go Authors. All rights reserved.// Use of this source code is governed by a BSD-style// license that can be found in the LICENSE file.packagemaintypeI1interface{}typeI2interface{pr()}funce()I1;vari1I1;vari2I2;funcmain(){i2=e().(I2);// bug089.go:16: fatal error: agen_inter i2i}