For 19.33-19.34 only (bumps CPerl-related functionality to the level of 20.3):

  patch_emacs_1933_syntax_assist.gz
    Makes Emacs recognize `syntax-table' text property => 99.99%-valid
    Perl parsing.  (rms-emacs-20.2-patch-inf-loop is included, but not
    the other bug fixes available for 20.2)

  diff_emacs1933_repeated_parse
    Makes Emacs return correct enclosing-block data from `parse-partial-sexp'
    even if parsing is split into several steps => orders-of-magnitude
    quickier indentation.

For 20.1-20.2 only (bumps CPerl-related functionality to the level of 20.3)

  diff_emacs20_2_94_repeated_parse
    See `diff_emacs1933_repeated_parse'.

  rms-emacs-20.2-experimental-patch-narrow+dirfiles+skipcomment+skipsyntax-better
    A must for 20.2 for some usages (Arg out of range and similar
    error messages with GNUS, narrow-buffer and others).

  rms-emacs-20.2-patch-inf-loop
    A must for 20.2 if Emacs "hangs" in CPerl-mode (you need C-g to unhang)