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Re: r6rs incompatibilities

From: Ludovic Courtès
Subject: Re: r6rs incompatibilities
Date: Wed, 26 May 2010 18:43:45 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.2 (gnu/linux)


Andy Wingo <address@hidden> writes:

> On Wed 26 May 2010 15:02, Julian Graham <address@hidden> writes:
>>>> We could make this more general, as the r7 committees are wont to do: if
>>>> #! is followed by whitespace or /, then read as a block comment;
>>>> otherwise read one token. In our case, we would read #!foo as #:foo. I
>>>> don't think this change would affect anyone. What do you think?
>>> Note that there are a couple of other #! constructs being considered for
>>> scheme 7, for example to control case folding. It seems more or less
>>> sensible. Perhaps we should read these as directives, and not as datums
>>> at all.
>>> There is also the possibility of introducing a reader option for this
>>> behavior.
>> Any chance we could go with my (admittedly sloppy) approach (or
>> something equally as quick) in the short term, and then, as they say
>> in the 'biz, "iterate?"  The above sounds sweet, but it seems like
>> it'd make more sense to tackle those things post-2.0.
> Heh, sure. But don't make it return SCM_UNSPECIFIED, please; make it
> treat #!r6rs as a comment. See

Functions that read comments all return ‘SCM_UNSPECIFIED’, which allows
them to be distinguished by the main loop.


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