$ guile-3.0.9 -c '(write (basename "foo/bar" "o/bar")) (newline)' Backtrace: [...] ERROR: In procedure basename: Value out of range: 18446744073709551614
Looks like this decides based on the whole pathname that the five-character suffix matches, and then tries to remove that suffix from the three-character basename. This is not sensible behaviour. It should probably signal an error if given any suffix argument that contains a slash character. If not, then it should be comparing the suffix against the basename, not the complete pathname, with the effect that a suffix containing a slash will never be matched and so no attempt will be made to remove it. -zefram
