This is an archived snapshot of W3C's public bugzilla bug tracker, decommissioned in April 2019. Please see the home page for more details.
Section 2, clause 2d, the Note reads "Every vacuous expression is identified explicitly in this specification. Some expressions can be determined to either return an empty sequence or raise an error, but are nevertheless not defined to vacuous." Insert penultimate word "be".
Checked in the fix.