port? in R5RS

["Sergei Egorov" <esl@informaxinc.com>]

Dear Scheme authors:

Section 3.2 (p.6) of the released R5RS mentions the port? predicate.
It is not defined, however, in section 6.6.1. Since it's probably
too late to change the report, I just would like to know whether I
should put port? into (scheme-report-environment 5) or not.

Regards,
Sergei