The following code evaluates successfully using eval-defun and runs as I would expect:

(require 'cl-lib)
(defun my/sample-function ()
  (let ((my-ht (make-hash-table)))
    (puthash :a 1 my-ht)
    (puthash :b 2 my-ht)
    (cl-loop for key being the hash-keys of my-ht using (hash-values value)
             (prin1 (cons key value)))))


=> (:a . 1)(:b . 2)nil

However, edebug-defun complains:

Debugger entered--Lisp error: (error "Bad ‘using’ clause")                 
  signal(error ("Bad ‘using’ clause"))                                     
  error("Bad `using' clause")                                              
  #[128 "\306\307\310\311\312\311\306\313!\"\"\">\204\314\312\315\3...
  macroexpand((cl-loop for key being the hash-keys of my-ht using (edebug-a...
  macroexp-macroexpand((cl-loop for key being the hash-keys of my-ht using ...
  macroexp--expand-all((cl-loop for key being the hash-keys of my-ht using ...

I imagine that edebug is choking during instrumentation on the hash-table -specific parts of the complex cl-loop macro. This is the first time I've encountered this sort of problem with edebug.

I'm not certain that this is not the result of user-error though. In Common Lisp documentation the keywords appear singular with a different verb ordering (example source):

(loop for k being the hash-key using (hash-value v) of h do ...

However, the structure used within my/sample-function above is the only form I have found to eval successfully.

I couldn't find anything relevant in debbugs.

emacs -Q version 25.1.1

  • #24750 I think
    – npostavs
    Commented Mar 25, 2017 at 18:00
  • @npostavs I agree. I can confirm that my problem is fixed in 26. Add as an answer and I'll close this Q; thx
    – ebpa
    Commented Mar 25, 2017 at 18:47

1 Answer 1


This is Emacs Bug#24750, which is fixed in the master branch (what will become 26.1). For earlier versions, you can add ["using" (symbolp symbolp)] to cl-loop's edebug spec.

(put 'cl-loop 'edebug-form-spec
     '(&rest &or
             [[&or "for" "as" "with" "and"]
             [[&or "from" "upfrom" "downfrom" "to" "upto" "downto" "above" "below" "by" "in" "on" "=" "across" "repeat" "while" "until" "always" "never" "thereis" "collect" "append" "nconc" "sum" "count" "maximize" "minimize" "if" "unless" "return"]
             ["using" (symbolp symbolp)]
             symbolp form))

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