gc: fix unsafe.Sizeof
Fixes #1608.
Fixes #1787.
R=ken2
CC=golang-dev
https://golang.org/cl/4530045
diff --git a/test/fixedbugs/bug339.go b/test/fixedbugs/bug339.go
new file mode 100644
index 0000000..eac7c5e
--- /dev/null
+++ b/test/fixedbugs/bug339.go
@@ -0,0 +1,20 @@
+// $G $D/$F.go && $L $F.$A && ./$A.out
+
+// Copyright 2011 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 1608.
+// Size used to be -1000000000.
+
+package main
+
+import "unsafe"
+
+func main() {
+ var a interface{} = 0
+ size := unsafe.Sizeof(a)
+ if size != 2*unsafe.Sizeof((*int)(nil)) {
+ println("wrong size: ", size)
+ }
+}
