The following expression produces possibly erroneous results in Guile 2.1.3.104-8f2f8 (with Debian's libgc1c2 version 1:7.4.2-8):
(let ((guardian (make-guardian)) (foo (eval '(lambda () #f) (interaction-environment)))) (set-procedure-property! foo 'wibbly 'wobbly) (guardian foo) (format #t "~S~%" (procedure-properties foo)) (set! foo #f) (gc) (do ((foo (guardian) (guardian))) ((not foo)) (format #t "~S~%" (procedure-properties foo)))) First it prints "((wibbly . wobbly))" as expected, but after the procedure is retrieved from the guardian the list of properties is empty. The properties are stored in a weak hash table, but shouldn't they be protected from GC while the procedure is in the guardian? -- Inteligenta persono lernas la lingvon Esperanton rapide kaj facile. Esperanto estas moderna, kultura lingvo por la mondo. Simpla, fleksebla, belsona, Esperanto estas la praktika solvo de la problemo de universala interkompreno. Lernu la interlingvon Esperanton!