Hi, In 4.0b12, I get a seg fault when I try to compile this bit of code: ====== bar.scm ========== (define-macro (bar) (include "foo.scm") `(pp ,(foo "foobar"))) (bar) ===================== ====== foo.scm ========== (define (foo x) x) ===================== $ gsc bar.scm Segmentation fault Regards, Ben