Edit's refusals name the pattern, not the line, and say when dot is empty

A ctl Edit that missed answered `Edit: no match for regexp "Edit
/nomatch/d"`, quoting the whole program; it now names the address that
missed (`no match for regexp /nomatch/`) and quotes no line after. An s
on an empty dot says `no substitution: dot is empty`. A \\1 is blamed
only once its pattern has matched, as before. tags.md says & is special
in s and not in c, a or i, as in sam.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

0 files changed, 0 insertions, 0 deletions