rsc: test

Change-Id: I08dcb375534b4459bea91db46d446d4bb856b432
Reviewed-on: https://go-review.googlesource.com/95315
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
diff --git a/rsc/go.mod b/rsc/go.mod
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/rsc/go.mod