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-rw-r--r--test/fixedbugs/issue8139.go50
1 files changed, 50 insertions, 0 deletions
diff --git a/test/fixedbugs/issue8139.go b/test/fixedbugs/issue8139.go
new file mode 100644
index 0000000..6e5607d
--- /dev/null
+++ b/test/fixedbugs/issue8139.go
@@ -0,0 +1,50 @@
+// 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.
+
+// Issue 8139. The x.(T) assertions used to write 1 (unexpected)
+// return byte for the 0-byte return value T.
+
+package main
+
+import "fmt"
+
+type T struct{}
+
+func (T) M() {}
+
+type M interface {
+ M()
+}
+
+var e interface{} = T{}
+var i M = T{}
+var b bool
+
+func f1() int {
+ if b {
+ return f1() // convince inliner not to inline
+ }
+ z := 0x11223344
+ _ = e.(T)
+ return z
+}
+
+func f2() int {
+ if b {
+ return f1() // convince inliner not to inline
+ }
+ z := 0x11223344
+ _ = i.(T)
+ return z
+}
+
+func main() {
+ x := f1()
+ y := f2()
+ if x != 0x11223344 || y != 0x11223344 {
+ fmt.Printf("BUG: x=%#x y=%#x, want 0x11223344 for both\n", x, y)
+ }
+}