Re: [Chicken-users] unquote in environments

[Daishi Kato]

Thanks, John.
I'll find out other workarounds.
--daishi

At Thu, 6 Dec 2007 10:56:19 -0500,
John Cowan wrote:
> 
> Daishi Kato scripsit:
> 
> > How do I expand the quasiquote macro in the environment?
> 
> The trouble is that in Chicken all environments share the same macros,
> so you are stuck with the definition of quasiquote unless you override it
> globally with a version that doesn't invoke ##sys#list or ##sys#cons.
> 
> > I don't want to extend the environment to have ##sys#list.
> > Maybe, extending macroexpand?
> 
> That doesn't help much; it's not the macroexpansion that's at issue,
> it's the eval that's done after calling macroexpand.  That eval
> uses the current (dynamic) environment.
> 
> BTW, Felix, the claim on the wiki that the interaction environment
> can't be extended appears to be false:
> 
> address@hidden:~/mpron$ csi
> 
> CHICKEN
> Version 2.736 - linux-unix-gnu-x86      [ manyargs dload ptables applyhook ]
> (c)2000-2007 Felix L. Winkelmann        compiled 2007-10-21 on skunk (Linux)
> 
> #;1> (use environments)
> ; loading /usr/local/lib/chicken/3/environments.so ...
> #;2> foo
> Error: unbound variable: foo
> #;2> (environment-extend! (interaction-environment) 'foo 32)
> #;3> foo
> 32
> 
> -- 
> You let them out again, Old Man Willow!                 John Cowan
> What you be a-thinking of?  You should not be waking!   address@hidden
> Eat earth!  Dig deep!  Drink water!  Go to sleep!
> Bombadil is talking.                                    http://ccil.org/~cowan
> 
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