1 // run 2 3 // Copyright 2010 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 // https://golang.org/issue/807 8 9 package main 10 11 type Point struct { 12 X, Y int64 13 } 14 15 type Rect struct { 16 Min, Max Point 17 } 18 19 func (p Point) Sub(q Point) Point { 20 return Point{p.X-q.X, p.Y-q.Y} 21 } 22 23 type Obj struct { 24 bbox Rect 25 } 26 27 func (o *Obj) Bbox() Rect { 28 return o.bbox 29 } 30 31 func (o *Obj) Points() [2]Point{ 32 return [2]Point{o.bbox.Min, o.bbox.Max} 33 } 34 35 var x = 0 36 37 func main() { 38 o := &Obj{Rect{Point{800, 0}, Point{}}} 39 p := Point{800, 300} 40 q := p.Sub(o.Bbox().Min) 41 if q.X != 0 || q.Y != 300 { 42 println("BUG dot: ", q.X, q.Y) 43 return 44 } 45 46 q = p.Sub(o.Points()[0]) 47 if q.X != 0 || q.Y != 300 { 48 println("BUG index const: ", q.X, q.Y) 49 } 50 51 q = p.Sub(o.Points()[x]) 52 if q.X != 0 || q.Y != 300 { 53 println("BUG index var: ", q.X, q.Y) 54 } 55 } 56
