Re: Bugs caused by recent use of define-derived-mode

[Richard Stallman]

One idea for how to fix the abbrev-table bugs is to modify
define-derived-mode to accept some optional keywords as arguments
before the body.  :same-abbrev-table could mean to use the parent's
abbrev table unmodified, and :same-syntax-table would do likewise for
the syntax table.

This change would be upward compatible for existing calls to
define-derived-mode that work correctly.