From: ludo@gnu.org (Ludovic Courtès)
To: guile-devel@gnu.org
Subject: Re: r6rs libraries
Date: Tue, 27 Jan 2009 21:09:29 +0100 [thread overview]
Message-ID: <87pri8ik92.fsf@gnu.org> (raw)
In-Reply-To: m3ocxt10ol.fsf@pobox.com
Hello!
Andy Wingo <wingo@pobox.com> writes:
> So from 7.2 of R6RS itself:
>
> An implementation may distinguish instances/visits of a library for
> different phases or to use an instance/visit at any phase as an
> instance/visit at any other phase.
>
> Which is to say, "we allow single instantiation" -- as Guile modules
> are.
[...]
>
> When an identifier appears as an expression in a phase that is
> inconsistent with the identifier’s level, then an implementation
> may raise an exception either at expand time or run time, or it may
> allow the reference.
>
> So, furthermore, it seems that not only may library A be instantiated at
> runtime, /it may be in library B's "import list" as well/. This is what
> happens with Guile's current module semantics.
These both come as a surprise to me, as I had always thought R6RS was
much stricter about phase separation. That's good news for "pure
interpreters"; extra work would still be needed to handle phases > 0 in
the compiler.
Thanks for the detailed reading!
Ludo'.
next prev parent reply other threads:[~2009-01-27 20:09 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <2bc5f8210812271705h3f57cb29w5bb83cb02abe971@mail.gmail.com>
[not found] ` <m3k59ktv2g.fsf@pobox.com>
[not found] ` <2bc5f8210812282238p1f91f352id7eca5280dc9ff6a@mail.gmail.com>
[not found] ` <2bc5f8210901012010g2ebb6effx5c966d0e26fe382b@mail.gmail.com>
[not found] ` <8763kt48zi.fsf@gnu.org>
[not found] ` <m3iqosrcn7.fsf@pobox.com>
[not found] ` <2bc5f8210901111521i1a5ec85em65ee20135cc55ebb@mail.gmail.com>
[not found] ` <877i4z89jy.fsf@gnu.org>
2009-01-26 0:27 ` r6rs libraries Julian Graham
2009-01-27 10:51 ` Andy Wingo
2009-01-27 20:09 ` Ludovic Courtès [this message]
2009-01-28 17:26 ` Julian Graham
2009-02-16 18:35 ` Julian Graham
2009-02-16 20:58 ` Andreas Rottmann
2009-02-18 6:08 ` Julian Graham
2009-02-18 14:27 ` Andreas Rottmann
2009-02-17 21:43 ` Ludovic Courtès
2009-02-18 5:37 ` Julian Graham
2009-02-18 8:53 ` Ludovic Courtès
2009-02-18 21:16 ` Andy Wingo
2009-03-04 5:23 ` Julian Graham
2009-03-04 8:39 ` Ludovic Courtès
2009-03-04 22:51 ` Julian Graham
2009-03-06 23:39 ` Ludovic Courtès
2009-03-07 0:43 ` Julian Graham
2009-03-22 22:30 ` Julian Graham
2007-02-06 15:55 R6RS Libraries Ludovic Courtès
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