I'm using the word "version" in the normal English sense, not the R6RS version number sense.
On Sun, Jun 14, 2009 at 9:38 PM, Ramana Kumar<[email protected]> wrote: >> It's the same thing. You want to handle the syntax-error exception by >> replacing the offending expression with another one of your choice. >> The replacement may be just #f or (asserion-violation 'foo "unbound") >> or whatever. Still, not possible to do correctly without hacking on >> psyntax. > > (BTW would it be a syntax error or an undefined violation?) > > All right. Maybe you can suggest how you would do this (portably). I > have a script full of tests for various versions of a library (and > these versions are in flux). Different versions export different > subsets of the set of all possible exports for this library. I'd like > to be able to run the test script on a particular version and have it > figure out which tests are applicable and run them, with minimal > effort (e.g. just changing a library name in the test script, or even > passing it in on the command line). > > On Sun, Jun 14, 2009 at 9:25 PM, Abdulaziz Ghuloum<[email protected]> wrote: >> >> On Jun 14, 2009, at 2:10 PM, Ramana Kumar wrote: >> >>>> So, you have a library that may or may not export a macro, say let^, >>>> and you have an expression that may or may not reference let^. If >>>> the expression references let^, and let^ was not exported, which >>>> would normally result in a syntax error, you want to defer the error >>>> until run time instead of being signaled at macro-expansion time. >>> >>> I actually don't want the error at all - I want to detect that let^ is >>> not exported and therefore remove the expression that references it >>> (or replace it with something). This can happen at macro expansion >>> time. Still not possible? >> >> It's the same thing. You want to handle the syntax-error exception by >> replacing the offending expression with another one of your choice. >> The replacement may be just #f or (asserion-violation 'foo "unbound") >> or whatever. Still, not possible to do correctly without hacking on >> psyntax. >> >> Aziz,,, >> >> >
