1 // run 2 3 // Copyright 2009 The Go Authors. All rights reserved. 4 // Use of this source code is governed by a BSD-style 5 // license that can be found in the LICENSE file. 6 7 package main 8 9 import "fmt" 10 11 type Element interface { 12 } 13 14 type Vector struct { 15 nelem int 16 elem []Element 17 } 18 19 func New() *Vector { 20 v := new(Vector) 21 v.nelem = 0 22 v.elem = make([]Element, 10) 23 return v 24 } 25 26 func (v *Vector) At(i int) Element { 27 return v.elem[i] 28 } 29 30 func (v *Vector) Insert(e Element) { 31 v.elem[v.nelem] = e 32 v.nelem++ 33 } 34 35 func main() { 36 type I struct{ val int } 37 i0 := new(I) 38 i0.val = 0 39 i1 := new(I) 40 i1.val = 11 41 i2 := new(I) 42 i2.val = 222 43 i3 := new(I) 44 i3.val = 3333 45 i4 := new(I) 46 i4.val = 44444 47 v := New() 48 r := "hi\n" 49 v.Insert(i4) 50 v.Insert(i3) 51 v.Insert(i2) 52 v.Insert(i1) 53 v.Insert(i0) 54 for i := 0; i < v.nelem; i++ { 55 var x *I 56 x = v.At(i).(*I) 57 r += fmt.Sprintln(i, x.val) // prints correct list 58 } 59 for i := 0; i < v.nelem; i++ { 60 r += fmt.Sprintln(i, v.At(i).(*I).val) 61 } 62 expect := `hi 63 0 44444 64 1 3333 65 2 222 66 3 11 67 4 0 68 0 44444 69 1 3333 70 2 222 71 3 11 72 4 0 73 ` 74 if r != expect { 75 panic(r) 76 } 77 } 78 79 /* 80 bug027.go:50: illegal types for operand 81 (<Element>I{}) CONV (<I>{}) 82 bug027.go:50: illegal types for operand 83 (<Element>I{}) CONV (<I>{}) 84 */ 85
