1 // cmpout 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 "go/ast"; 10 11 func g(list []ast.Expr) { 12 n := len(list)-1; 13 println(list[n].Pos()); 14 } 15 16 17 // f is the same as g except that the expression assigned to n is inlined. 18 func f(list []ast.Expr) { 19 // n := len(list)-1; 20 println(list[len(list)-1 /* n */].Pos()); 21 } 22 23 24 func main() { 25 list := []ast.Expr{&ast.Ident{}}; 26 g(list); // this works 27 f(list); // this doesn't 28 } 29 30 31 /* 32 0 33 throw: index out of range 34 35 panic PC=0x2bcf10 36 throw+0x33 /home/gri/go/src/pkg/runtime/runtime.c:71 37 throw(0x470f8, 0x0) 38 systhrowindex+0x1c /home/gri/go/src/pkg/runtime/runtime.c:45 39 systhrowindex() 40 mainf+0x26 /home/gri/go/test/bugs/bug206.go:16 41 mainf(0x2b9560, 0x0) 42 mainmain+0xc3 /home/gri/go/test/bugs/bug206.go:23 43 mainmain() 44 mainstart+0xf /home/gri/go/src/pkg/runtime/amd64/asm.s:55 45 mainstart() 46 goexit /home/gri/go/src/pkg/runtime/proc.c:133 47 goexit() 48 */ 49
