Stripping leading commas breaks Fennel macros

[dundalek]

The formatter works surprisinly well for Fennel (a Clojure-inspired dialect for Lua), I like the output much better than fnlfmt.
The only issue I encountered is difference in macros, Fennel uses comma for unqoute: ,form is like ~form in Clojure meaning leading commas are significant. When formatter strips them it can break a macro.

Example:

(macro when-let-repro [binding & body]
  (let [[binding-form expr] binding]
    `(let [temp# ,expr]
       (when temp#
         (let [,binding-form temp#]
           ,(unpack body))))))

Leading comma gets stripped:

@@ -2,5 +2,5 @@
   (let [[binding-form expr] binding]
     `(let [temp# ,expr]
        (when temp#
-         (let [,binding-form temp#]
+         (let [binding-form temp#]
            ,(unpack body))))))

Unfortunately Fennel does not support metadata, so adding #_:standard-clj/ignore causes compile error.

[dundalek]

I figured a workaround by adding a dummy comment which pushes the form on the next line and the comma does not get stripped:

(macro when-let-repro [binding & body]
  (let [[binding-form expr] binding]
    `(let [temp# ,expr]
       (when temp#
         (let [;; dummy
               ,binding-form temp#]
           ,(unpack body))))))