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Re: Can't compile `or' pcase pattern
From: |
Stefan Monnier |
Subject: |
Re: Can't compile `or' pcase pattern |
Date: |
Thu, 11 May 2017 22:29:56 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/26.0.50 (gnu/linux) |
> #+begin_src emacs-lisp
> (el-search--matcher
> '(or (l ^ defstruct object)
> (l ^ (and (symbol "def") (or (pred macrop) (pred special-form-p)))
> object)))
> #+end_src
Looking at the definition of `l` I think you're pushing pcase a bit
further than it can go.
A bit like a DFA representation of a regexp can explode, a pcase's
expansion can explode in some cases, and your `l` has all the tools
needed to triggger such explosions.
Maybe you can reduce the pain, by looking at the expansion and
trying to see how pcase-mutually-exclusive-p could be improved to get
a better result.
Stefan