Add testcase/quine.mk
diff --git a/testcase/quine.mk b/testcase/quine.mk
new file mode 100644
index 0000000..74ecc5d
--- /dev/null
+++ b/testcase/quine.mk
@@ -0,0 +1,7 @@
+define q
+$$(info define q)
+$$(info $$(subst $$$$,$$$$$$$$,$$q))
+$$(info endef)
+$$(info $$$$(eval $$$$q))
+endef
+$(eval $q)