Reproduction: scheme@(guile-user)> (import (scheme base)) scheme@(guile-user)> (read-u8) ice-9/boot-9.scm:1685:16: In procedure raise-exception: In procedure get-u8: Wrong type argument in position 1 (expecting open input port): #<output: file /dev/pts/9>
Expected: (read-u8) should read a byte from the input port, not the output port. In scheme/base.scm: (define* (read-u8 #:optional (port (current-output-port))) (get-u8 port)) I think this is a typo, where current-output-port should be current-input-port? -Rui
