Add a bunch of tests for complicated rules
diff --git a/test/double_colon_rule.mk b/test/double_colon_rule.mk
new file mode 100644
index 0000000..1a2c50b
--- /dev/null
+++ b/test/double_colon_rule.mk
@@ -0,0 +1,6 @@
+# TODO(hamaji): Fix
+
+test::
+	echo FOO
+test::
+	echo BAR