cmd/gc: fix spurious 'use of untyped nil' error
Fixes #6402
LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/81340044
diff --git a/test/fixedbugs/issue6402.go b/test/fixedbugs/issue6402.go
new file mode 100644
index 0000000..da5980c
--- /dev/null
+++ b/test/fixedbugs/issue6402.go
@@ -0,0 +1,13 @@
+// errorcheck
+
+// 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 6402: spurious 'use of untyped nil' error
+
+package p
+
+func f() uintptr {
+ return nil // ERROR "cannot use nil as type uintptr in return argument"
+}
