1 // run 2 3 // Copyright 2014 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 ( 10 "fmt" 11 "io" 12 "runtime" 13 ) 14 15 type T struct { 16 io.Closer 17 } 18 19 func f1() { 20 // The 5 here and below depends on the number of internal runtime frames 21 // that sit between a deferred function called during panic and 22 // the original frame. If that changes, this test will start failing and 23 // the number here will need to be updated. 24 defer checkLine(5) 25 var t *T 26 var c io.Closer = t 27 c.Close() 28 } 29 30 func f2() { 31 defer checkLine(5) 32 var t T 33 var c io.Closer = t 34 c.Close() 35 } 36 37 func main() { 38 f1() 39 f2() 40 } 41 42 func checkLine(n int) { 43 if err := recover(); err == nil { 44 panic("did not panic") 45 } 46 var file string 47 var line int 48 for i := 1; i <= n; i++ { 49 _, file, line, _ = runtime.Caller(i) 50 if file != "<autogenerated>" || line != 1 { 51 continue 52 } 53 return 54 } 55 panic(fmt.Sprintf("expected <autogenerated>:1 have %s:%d", file, line)) 56 } 57
