Hi, Patrick Bernaud <patri...@chez.com> writes:
> -%<---- when.scm ----%<- > (define-macro (when cond exp . rest) > `(if ,cond > (begin ,exp . ,rest))) > -%<---- when.scm ----%<- > > -%<---- test.scm ----%<- > (load "when.scm") > (when #t (display "Launching missiles!\n")) > -%<---- test.scm ----%<- [...] > ERROR: In procedure catch-closure: > ERROR: Wrong type to apply: #<syntax-transformer when> This is because ‘when’ wasn’t expanded in ‘test.scm’, because its definition wasn’t visible at the time ‘test.scm’ was compiled (remember that ‘load’ is something that happens at run time.) Thus the compiler assumed that ‘when’ is a global variable, leading to the error above (compiling ‘test.scm’ with ‘guile-tools compile -Wunbound-variable’ should have given a warning.) The solution is to get rid of ‘load’: either use ‘(include "when.scm")’, or turn ‘when.scm’ into a module and use it in ‘test.scm’. Thanks, Ludo’.
