Add 'x/' from commit 'a10a11b9d371f36b7c3510da32a1d70b74e27bd1'

git-subtree-dir: x
git-subtree-mainline: 7d05a6ee8f
git-subtree-split: a10a11b9d3

x/types/empty/message.go

@@ -0,0 +1,4 @@
+package empty
+
+// Message is a placeholder type used when encoding json messages.
+type Message struct{}