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bug#64537: mix lists and vectors when using backquote
From: |
Stefan Kangas |
Subject: |
bug#64537: mix lists and vectors when using backquote |
Date: |
Sun, 24 Sep 2023 02:47:22 -0700 |
Stefan Monnier <monnier@iro.umontreal.ca> writes:
>>> The docstring of ‘backquote’ says “vectors work just like lists”.
>>> Should we also clarify that mixing lists and vectors these 2 way:
>>>
>>> `(... ,@[...]) ; by contrast: `(,@[] 1) => (1)
>>> `[,@'()] ; by contrast: `[1 ,@'()] => [1]
>>>
>>> will lead to unexpected behavior? Or suggest not doing so? Or let
>>> ‘backquote’ detect this and signal an error?
>>
>> Copying in Stefan Monnier.
>
> Is there a good reason why we have those unexpected behaviors?
I see two unexpected behaviors:
1. `(... ,@[...]) => (\... . [\...])
2. `[,@'()] => [(\,@ 'nil)]
I'd say these are the expected values:
1. `(... ,@[...]) => (\... \...)
2. `[,@'()] => []
I don't see any good reason for them, so perhaps these are just plain
bugs to be fixed?