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bug#61281: “`(a \, b)” equals to “`(a . , b)”
From: |
Drew Adams |
Subject: |
bug#61281: “`(a \, b)” equals to “`(a . , b)” |
Date: |
Wed, 8 Feb 2023 03:09:04 +0000 |
> > > It is obvious that the Lisp implementation of
> > > the "`" macro receives symbolic expressions.
> >
> > This is about the Lisp reader. When you write
> > ",X" in that explanatory comment it's ambiguous
> > whether "X" is an arbitrary sequence of chars
> > or some Lisp sexp (read separately after reading
> > the ","). ",abcd" is handled differently than
> > ", abcd", as we've gone over several times now.
>
> So you want to add to the text that X is an expression? Or anything
> else? We surely don't want to explain the complete parsing process
> there. What do you suggest to write in that comment?
Dunno. I didn't intend to use ",X" at all. That
was from you.
I think that should particularly be pointed out in
comments is this bug: that "\," evaluates, just
like "," does, when inside backquote. And it even
splices, like ",@" does. This isn't obvious, even
if it might be a rare/corner case.
"\," that is not immediately followed by a symbol
char is handled as if you'd written ",@" instead.
One would (I would) expect a bare "\," to be read
as a symbol with no special behavior, just as
reading "abc" is (but remove all the double-quotes
when reading this, of course).
I'm sorry, but now I'm just repeating myself. I
really don't have anything more/new to say about
this.
- bug#61281: “`(a \, b)” equals to “`(a . , b)”, (continued)
bug#61281: “`(a \, b)” equals to “`(a . , b)”, Michael Heerdegen, 2023/02/05
- bug#61281: “`(a \, b)” equals to “`(a . , b)”, Drew Adams, 2023/02/06
- bug#61281: “`(a \, b)” equals to “`(a . , b)”, Drew Adams, 2023/02/06
- bug#61281: “`(a \, b)” equals to “`(a . , b)”, Michael Heerdegen, 2023/02/06
- bug#61281: “`(a \, b)” equals to “`(a . , b)”, Drew Adams, 2023/02/06
- bug#61281: “`(a \, b)” equals to “`(a . , b)”, Michael Heerdegen, 2023/02/06
- bug#61281: “`(a \, b)” equals to “`(a . , b)”, Drew Adams, 2023/02/07
- bug#61281: “`(a \, b)” equals to “`(a . , b)”, Michael Heerdegen, 2023/02/07
- bug#61281: “`(a \, b)” equals to “`(a . , b)”,
Drew Adams <=
- bug#61281: “`(a \, b)” equals to “`(a . , b)”, Michael Heerdegen, 2023/02/08
- bug#61281: “`(a \, b)” equals to “`(a . , b)”, Drew Adams, 2023/02/08