I noticed this when updating cider via melpa, and I wasn't sure if it's 
already known about or whether it is even an problem. I thought I'd ask 
here before submitting an issue to github.

Compiling file 
/Users/peterhull/.emacs.d/elpa/cider-20171209.1602/cider-browse-spec.el at 
Sun Dec 10 11:29:29 2017
cider-browse-spec.el:277:1:Error: Wrong number of arguments: when-let, 1

Compiling file 
/Users/peterhull/.emacs.d/elpa/cider-20171209.1602/cider-classpath.el at 
Sun Dec 10 11:29:29 2017
cider-classpath.el:102:1:Error: Wrong number of arguments: when-let, 1

Compiling file 
/Users/peterhull/.emacs.d/elpa/cider-20171209.1602/cider-client.el at Sun 
Dec 10 11:29:29 2017
cider-client.el:143:1:Error: Wrong number of arguments: when-let, 1

Compiling file 
/Users/peterhull/.emacs.d/elpa/cider-20171209.1602/cider-common.el at Sun 
Dec 10 11:29:29 2017
cider-common.el:186:1:Error: Wrong number of arguments: when-let, 4

Compiling file 
/Users/peterhull/.emacs.d/elpa/cider-20171209.1602/cider-compat.el at Sun 
Dec 10 11:29:29 2017

Compiling file 
/Users/peterhull/.emacs.d/elpa/cider-20171209.1602/cider-debug.el at Sun 
Dec 10 11:29:29 2017
cider-debug.el:226:1:Error: Wrong number of arguments: when-let, 1

Compiling file 
/Users/peterhull/.emacs.d/elpa/cider-20171209.1602/cider-doc.el at Sun Dec 
10 11:29:29 2017
cider-doc.el:263:1:Error: Wrong number of arguments: when-let, 1

And for example, the first instance looks like this

(defun cider-browse-spec--browse-at (&optional pos)
  "View the definition of a spec.

Optional argument POS is the position of a spec, defaulting to point.  POS
may also be a button, so this function can be used a the button's `action'
property."
  (interactive)
  (let ((pos (or pos (point))))
    (when-let ((spec (button-get pos 'spec-name)))
      (cider-browse-spec--browse spec))))

I am not an elisp expert but I think the syntax of when-let is (when-let 
(var value) body) rather than (when-let ((var value)) body)

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