Hello, Kazuki, Thank you for the explanation. Maybe my worry was too early. :) Regards, Jae-hyeon Kazuki Ohta <mover at hct.zaq.ne.jp> writes: > So, if we use the R5RS compatible scheme interpreter, we'll need to > implement sanity check for '() in context-update-preedit. passing #f to > contex-update-preedit is semantically wrong, I think.