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Re: pcase-dolist

From: Michael Heerdegen
Subject: Re: pcase-dolist
Date: Wed, 08 Jul 2015 22:50:23 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux)

Artur Malabarba <address@hidden> writes:

> Only if you make them like this. The idea of `(if-let ((a expr))
> body)' is that evaluate `expr' and, if it is non-nil, bind it to a and
> run `body'. This doesn't exclude the possibility of `a' being a pcase
> pattern. Just make sure that the the check for nil expr is done as a
> separate thing, before the pattern matching.

I don't know if I would like that semantic.  It doesn't sound intuitive
to me.

> If you implement pcase-if-let the way you suggest above, isn't that
> just the same as pcase?

For one binding, yes.  The body would be at a more prominent place

Isn't if-let not just pcase as well?

  (if-let ((var expr)) then else)

  (pcase expr ((and var (guard var)) then) (_ else))


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