In guile 1.6.3 on a recent i386 debian I was nosing around ice-9
lineio and struck an apparent problem with read-char used after an
unread-string. For instance a program foo.scm
(use-modules (ice-9 lineio))
(let ((port (make-line-buffering-input-port
(open-input-string "hello"))))
(unread-string "world" port)
(display (read-char port)) (newline))
run "guile -s foo.scm" produces
ERROR: Wrong number of arguments to #<primitive-procedure string-ref>
whereas I hoped it would print a character.
I guess this is just a missing index for the string-ref call in the
getc handler of make-line-buffering-input-port. Judging by the
substring taken I guess it should be 0.
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