Imported Upstream version 1.3upstream/1.3

1 files changed, 56 insertions, 0 deletions

diff --git a/test/fixedbugs/issue4388.go b/test/fixedbugs/issue4388.go
new file mode 100644
index 000000000..2e052e138
--- /dev/null
+++ b/test/fixedbugs/issue4388.go
@@ -0,0 +1,56 @@
+// run
+
+// Copyright 2014 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import (
+	"fmt"
+	"io"
+	"runtime"
+)
+
+type T struct {
+	io.Closer
+}
+
+func f1() {
+	// The 4 here and below depends on the number of internal runtime frames
+	// that sit between a deferred function called during panic and
+	// the original frame. If that changes, this test will start failing and
+	// the number here will need to be updated.
+	defer checkLine(4)
+	var t *T
+	var c io.Closer = t
+	c.Close()
+}
+
+func f2() {
+	defer checkLine(4)
+	var t T
+	var c io.Closer = t
+	c.Close()
+}
+
+func main() {
+	f1()
+	f2()
+}
+
+func checkLine(n int) {
+	if err := recover(); err == nil {
+		panic("did not panic")
+	}
+	var file string
+	var line int
+	for i := 1; i <= n; i++ {
+		_, file, line, _ = runtime.Caller(i)
+		if file != "<autogenerated>" || line != 1 {
+			continue
+		}
+		return
+	}
+	panic(fmt.Sprintf("expected <autogenerated>:1 have %s:%d", file, line))
+}