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Re: r6rs incompatibilities

From: Andy Wingo
Subject: Re: r6rs incompatibilities
Date: Sun, 23 May 2010 22:52:43 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.0.92 (gnu/linux)

Hi Julian,

On Sun 23 May 2010 19:24, Julian Graham <address@hidden> writes:

>> What happens with this patch if the file only contains the four
>> characters "#!r6" followed by EOF?  Does it behave appropriately
>> after calling scm_ungetc on EOF?  (I guess that would make it an
>> unterminated hash bang comment.)
> If the fifth character is EOF instead of 'r', control is handed to
> scm_read_scsh_block_comment (after ungetting EOF), which raises the
> appropriate unterminated comment error.

If you add a test case I'm fine with this solution; though I would
prefer it to be read as #:r6rs.

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?


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