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From: | Stefan Monnier |
Subject: | bug#42147: 28.0.50; pure vs side-effect-free, missing optimizations? |
Date: | Sat, 25 Jul 2020 18:30:10 -0400 |
User-agent: | Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) |
>>> There are also some functions declared 'pure' that appear to have side >>> effects: kbd, package-get-version >> Which side-effects are you thinking of? > They both clobber the match data. It's not a problem w.r.t optimizing pure functions, tho: those functions don't promise to modify the match data, so it's OK to replace calls to them with their return value. But yes, it's a problem because `C-h o kbd RET` says explicitly that it doesn't change the match data :-( Stefan
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