Add check for useless assignments

emacs-elsa / Elsa

Emacs Lisp Static Analyzer and gradual type system.

GNU General Public License v3.0

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Open Fuco1 opened 6 years ago

Fuco1 commented 6 years ago

The implementation is related to #39.

We can have code like this:

(setq a 1) ;; this is useless
(other forms not using a)
(setq a 2) ;; a == 1 was never used
(setq b a)

So we look for variables/forms which are assigned but never read.