"Scott G. Miller" <scgmille@xxxxxxxxxxxxxxxxxxxxxx> writes:
> Its not as bad as it seems. Annotations are the one feature we do rely
> heavily on psyntax for. The expression syntax was introduced to handle
> various problems with redefinition. I'm more concerned with breaking
> compatibility in the module system.
How do we even get to the point where a new expander has been installed?
It better not involve pre-expanding the expander code, loading it during
heap build and seeing what breaks. I've done that with some psyntax
tweaks a few times and it is no fun. Tracking down errors in expanded code
loaded during such an early stage of the heap build - when none of the
nice error reporting is in place - is a nightmare, and the whole cycle
is very time consuming.
I think we somehow have to find a way of doing our expander debugging in
a fully-fledged REPL, with nice error reporting and short
round-trips. The same goes for fixing incompatibilities in the module
system.
Matthias
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