version 1.0.0:
  - Supports named subpatterns (a la Ruby1.9 style, "(?<...>...)").

version 1.0.pre1:
  - Supports named subpatterns (a la Python style, "(?P<...>...)").

version 0.9.3:
  - Supports OCaml version 3.09+dev6. (loc hidden variable renamed to _loc)

version 0.9.5.2:
  - Small change of the order of syntax rules
    (camlp4 3.08.1+1(?) introduces new warning message about
     entering error-recovery mode)

version 0.9.5.1:
  - Fixed syntax error (camlp4o in OCaml 3.08.1 become stricter than before)

version 0.9.5:
  - Supports OCaml version 3.07+19. (MLast.loc changed)
  - Fixed build problem on 64-bit platforms.
    Thanks Xavier Leroy, Sven Luther and all concerned Debian peoples for the bug fix.

version 0.9.4:
  - Supports OCaml version 3.07+5. (Token.eval_string changed)

version 0.9.3:
  - Supports OCaml version 3.07. (work around for 3.07 camlp4 bug)

version 0.9.2:
  - Supports OCaml version 3.07+ beta1.

version 0.9.1:
  - Bug fix:
     Parsing of regular expression failed when "(?:)" appears at the
     beginning of the expression.
     Thanks Mark McLauchlan for bug report.

  - Supports OCaml version 3.06+37.

version 0.9.0:
  - First public release.