--- a/spec/util_async_spec.lua	Mon Dec 23 21:29:34 2019 +0100
+++ b/spec/util_async_spec.lua	Mon Dec 23 21:33:10 2019 +0100
@@ -544,6 +544,8 @@
 			assert.equal(r1.state, "ready");
 		end);
 
+		-- luacheck: ignore 211/rf
+		-- FIXME what's rf?
 		it("should support multiple done() calls", function ()
 			local processed_item;
 			local wait, done;