Common Lisp: Variable Defined but Not Used

hydraMax · 11-09-2013, 10:19 PM

I've got some common lisp code (SBCL) where I have to provide a lambda that takes a single argument, but in this case the argument is not actually used. So I get the Style Warning about defining but not using the variable. Is there a trick to suppress the warning for that variable without disabling that warning type completely?

E.g., in Haskell you can replace the variable name with an underscore, which tells the compiler you don't care what value is there.

ntubski · 11-09-2013, 10:57 PM

You can declare it as ignored, or ignorable.

Code:

(lambda (x) (declare (ignore x)) ...)

hydraMax · 11-10-2013, 02:13 AM

Quote:

Originally Posted by ntubski

You can declare it as ignored, or ignorable.

Code:

(lambda (x) (declare (ignore x)) ...)

Thanks!