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https://github.com/golang/go
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49 lines
1.0 KiB
Go
49 lines
1.0 KiB
Go
// cmpout
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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import "go/ast";
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func g(list []ast.Expr) {
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n := len(list)-1;
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println(list[n].Pos());
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}
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// f is the same as g except that the expression assigned to n is inlined.
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func f(list []ast.Expr) {
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// n := len(list)-1;
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println(list[len(list)-1 /* n */].Pos());
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}
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func main() {
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list := []ast.Expr{&ast.Ident{}};
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g(list); // this works
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f(list); // this doesn't
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}
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/*
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0
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throw: index out of range
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panic PC=0x2bcf10
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throw+0x33 /home/gri/go/src/pkg/runtime/runtime.c:71
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throw(0x470f8, 0x0)
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sys·throwindex+0x1c /home/gri/go/src/pkg/runtime/runtime.c:45
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sys·throwindex()
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main·f+0x26 /home/gri/go/test/bugs/bug206.go:16
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main·f(0x2b9560, 0x0)
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main·main+0xc3 /home/gri/go/test/bugs/bug206.go:23
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main·main()
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mainstart+0xf /home/gri/go/src/pkg/runtime/amd64/asm.s:55
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mainstart()
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goexit /home/gri/go/src/pkg/runtime/proc.c:133
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goexit()
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*/
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