Here's a simple reproducer:
(use-modules (ice-9 binary-ports)
(ice-9 suspendable-ports)
(rnrs bytevectors))
(define (test)
(let* ((sequence
'(#xf4 #xa4 #xbd #xa4))
(p (open-bytevector-input-port
(u8-list->bytevector sequence))))
(set-port-encoding! p "UTF-8")
(set-port-conversion-strategy! p 'substitute)
(peek (read-char p))))
(test)
(install-suspendable-ports!)
(test)
If you run it, it outputs #\� as expected the first time, but then using
suspendable ports, it raises an exception. The behaviour should be the
same.
;;; (#\�)
Backtrace:
In ice-9/boot-9.scm:
1752:10 8 (with-exception-handler _ _ #:unwind? _ # _)
In unknown file:
7 (apply-smob/0 #<thunk 7f3f09cbe300>)
In ice-9/boot-9.scm:
724:2 6 (call-with-prompt ("prompt") #<procedure 7f3f09ccb320 …> …)
In ice-9/eval.scm:
619:8 5 (_ #(#(#<directory (guile-user) 7f3f09cc1c80>)))
In ice-9/boot-9.scm:
2836:4 4 (save-module-excursion #<procedure 7f3f09cb2300 at ice-…>)
4388:12 3 (_)
In /home/chris/Projects/Guile/guile/bad-unicode.scm:
12:10 2 (test)
In ice-9/suspendable-ports.scm:
591:33 1 (read-char _)
499:12 0 (peek-char-and-next-cur/utf8 _ _ _ _)
ice-9/suspendable-ports.scm:499:12: In procedure peek-char-and-next-cur/utf8:
In procedure integer->char: Argument 1 out of range: 1199972
