* Empty fields that are the last of the list *and* match the

snippet's exit are skipped automatically.
* Added a printf snippet to show off. 
* The printf snippet also exhibits the back-adjacent mirror bug

snippets/text-mode/snippet-mode/mirror

@@ -2,5 +2,4 @@
 # key : $m
 # contributor : joaotavora
 # --
-\${${2:n}:${4:\$(${5:reflection-fn})}\}$0
-
+\${${2:n}:${4:\$(${5:reflection-fn})}\}$0