[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
bug#19670: 24.4; pcase-let bug?
From: |
Leo Liu |
Subject: |
bug#19670: 24.4; pcase-let bug? |
Date: |
Mon, 26 Jan 2015 22:27:20 +0800 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.4 (OS X 10.10.1) |
On 2015-01-24 13:07 +0800, Stefan Monnier wrote:
> Feature: the `pcase' form can have several branches (and defaults to
> nil if no branch matches), whereas the `pcase-let' form doesn't have the
> luxury of a "default case if it doesn't match", so we have to choose
> between "signal an error if it doesn't match" or "pretend it matched".
> I opted for the second choice.
I still find this inconsistent. Another similar-looking example:
(pcase 'whatever
((let `(,x) '(1 2 3)) (list x))) ;; => nil
It seems to make more sense for pcase-let to signal an error or bind X
to nil. WDYT?
Leo