code review 6542058: cmd/gc: fix use of nil interface, slice

test/fixedbugs/bug444.go

Index: test/fixedbugs/bug444.go
===================================================================
--- a/test/fixedbugs/bug444.go
+++ b/test/fixedbugs/bug444.go
@@ -6,6 +6,7 @@
 
 // The no-op conversion here used to confuse the compiler
 // into doing a load-effective-address of nil.
+// See issue 3670.
 
 package main
 
@@ -13,7 +14,23 @@
 
 type T interface {}
 
+var x bool
+
 func main() {
         reflect.TypeOf(nil)
-        reflect.TypeOf(T(nil)) // used to fail
+        reflect.TypeOf(T(nil)) // used to miscompile
+        shouldPanic()
 }
+
+func f() byte {
+	return []byte(nil)[0] // used to miscompile
+}
+
+func shouldPanic() {
+	defer func() {
+		if recover() == nil {
+			panic("not panicking")
+		}
+	}()
+	f()
+}