1 // run 2 3 // Copyright 2016 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 // Make sure we don't start marshaling (writing to the stack) 8 // arguments until those arguments are evaluated and known 9 // not to unconditinally panic. If they unconditionally panic, 10 // we write some args but never do the call. That messes up 11 // the logic which decides how big the argout section needs to be. 12 13 package main 14 15 type W interface { 16 Write([]byte) 17 } 18 19 type F func(W) 20 21 func foo(f F) { 22 defer func() { 23 if r := recover(); r != nil { 24 usestack(1000) 25 } 26 }() 27 f(nil) 28 } 29 30 func main() { 31 foo(func(w W) { 32 var x []string 33 w.Write([]byte(x[5])) 34 }) 35 } 36 37 func usestack(n int) { 38 if n == 0 { 39 return 40 } 41 usestack(n - 1) 42 } 43
