Comments (2)
justinethier
commented on July 17, 2024
More from http://eval.apply.googlepages.com/eccentric.txt :
As macros get more complicated, they become trickier to debug. Most
Scheme systems have a mechanism by which you can invoke the macro
expansion system on a piece of list structure and get back the
expanded form. In MzScheme you could do this:
(syntax-object->datum
(expand '(nth-value 1 (let ((q (get-number)))
(quotient/remainder q d)))))
In MIT Scheme,
(unsyntax (syntax '(nth-value 1 (let ((q (get-number)))
(quotient/remainder q d)))
(nearest-repl/environment)))
from husk-scheme.
justinethier
commented on July 17, 2024
Added a special form expand to help debug macros.
For example:
huski> (expand (let* ((x 1) (y x)) y))
((lambda (x4) ((lambda (y8) ((lambda () y8))) x4)) 1)
from husk-scheme.
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