now the method lookup actually works (and I understand why! 😄), reduces unnecessary loops, and has a few comments

tests/mut_mut_macro.rs

@@ -0,0 +1,11 @@
+#![feature(plugin)]
+#![plugin(clippy, regex_macros)]
+
+extern crate regex;
+
+#[test]
+#[deny(mut_mut)]
+fn test_regex() {
+	let pattern = regex!(r"^(?P<level>[#]+)\s(?P<title>.+)$");
+	assert!(pattern.is_match("# headline"));
+}