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Re: Eval, tail calls, (current-module), and backward compatibility

From: Mark H Weaver
Subject: Re: Eval, tail calls, (current-module), and backward compatibility
Date: Sat, 21 Jan 2012 14:06:14 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.92 (gnu/linux)

David Kastrup <address@hidden> writes:

> Mark H Weaver <address@hidden> writes:
>> Remember, (current-module) is a compile-time concept, not a run-time
>> concept.

I should clarify this statement.  (current-module) is used by the code
that's doing the compiling (e.g. the REPL), _not_ by the code that's
being compiled.  It is a run-time variable used by REPLs and compilers
to keep track of which module should be used to compile the next form.

> Then current-module should probably be a macro, not a function.  In
> which case the tail call problem would take care of itself.

A core syntax form to retrieve the module name baked into a given
identifier (a constant) would probably be useful, and indeed I suspect
we'll have it in 2.0.4 because it'll be needed for Andy's implementation
of `local-eval'.

However, that's a different concept from (current-module), therefore it
would need a different name.  To understand (current-module), please
read my first post in this thread.  It would make no sense as a macro.


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