Sys.Signals module for a Variant type of signals (and a set_signal function that...

[ocaml.git] / camlp4 / CHANGES

- [...]
  In the revised syntax of parsers the "?" is now a "??" like in the orignal
  syntax to not conflict with optional labels.

- [29 Jun 05] Add private row types. Make "private" a type constructor
  "TyPrv" rather than a flag. (Jacques)

- [09 Jun 04] Moved "-no_quot" option from pa_o to camlp4, enabling to
  use it indepently fom pa_o.cmo.

- [17 Nov 04] Renamed "loc" into "_loc", introducing an incompatibility
  with existing code (3.08.x and before). Such code can generally run
  unmodified using the -loc option (camlp4 -loc "loc").

Camlp4 Version 3.08.2
------------------------
- [07 Oct 04] Changes in the interfaces plexer.mli and pcaml.mli:
   - plexer.mli: introduced a new lexer building function `make_lexer',
     similar to `gmake', but returning a triple of references in addition
     (holding respectively the character number of the beginning of the
     current line, the current line number and the name of the file being
     parsed).
   - pcaml.mli: a new value `position'. A global reference to a triple like
     the one mentioned above.
- [07 Sep 04] Camlp4 grammars `error recovery mode' now issues a warning
  when used (but this warning is disabled by default).

Camlp4 Version 3.08.[01]
------------------------
- [05 Jul 04] creation of the `unmaintained' directory:
  pa_format, pa_lefteval, pa_ocamllex, pa_olabl, pa_scheme and pa_sml
  go there, each in its own subdir. Currently, they compile fine.
- [05 Jul 04] pa_ifdef, subsumed by pa_macro since 3.07, prints a warning
  when loaded, encouraging use of pa_macro.
- [01 July 04] profiled versions of Camlp4 libs are *NOT* installed
  by default (not even built). To build and install them, uncomment
  the line PROFILING=prof in camlp4/config/Makefile.tpl, and then
  make opt.opt && make install
- [22-23 June 04] `make install' now installs also pa_[or].cmx, pa_[or]p.cmx,
  pa_[or]_fast.cmx, and odyl.cmx
- [12 may 04] Added to the camlp4 tools the -version option that prints
  the version number, in the same way as the other ocaml tools.
- [12 may 04] Locations are now handled as in OCaml. The main benefit
  is that line numbers are now correct in error messages. However, this
  slightly changes the interface of a few Camlp4 modules (see ICHANGES).
  ** Warning: Some contribs of the camlp4 distribution are broken because
  of this change. In particular the scheme/lisp syntaxes.
- [20 nov 03] Illegal escape sequences in strings now issue a warning.

Camlp4 Version 3.07
___________________

- [29 Sep 03] Camlp4 code now licensed under the LGPL minus clause 6.
- [09 Sep 03] Added tokens LABEL and OPTLABEL in plexer, and use them in
  both parsers (ocaml and revised). There was, afaik, no other way to fix
  ambiguities (bugs) in parsing labels and type constraints.

Camlp4 Version 3.07 beta1
________________________

- [July 03] Updated the ocaml/camlp4 CVS tree with the camlp4
  "parallel" CVS tree, which becomes obsolete from now on.
   Added support for recursive modules, private data constructors, and
   new syntaxes for integers (int32, nativeint, ...).

Camlp4 Version 3.06++
-----------------------

- [02 Dec 02] In AST predefined quotation, changed antiquotations for
  "rec", "mutable": now all are with coercion "opt": $opt:...$ (instead
  of "rec" and "mut"). Added antiquotation for "private". Cleaned up
  the entries for "methods" and for labelled and optional parameters.
- [29 Nov 02] Removed all "extract_crc" stuff no more necessary with
  the new interface of Dynlink.
- [26 Nov 02] Added ability to use "#use" directives in compiled files.
- [21 Nov 02] Changed Scheme syntax for directives: now, e.g. #load "file"
  is written: # (load "file"). Added directives in "implem", "interf" and
  "use" directive.
- [20 Nov 02] Added Grammar.glexer returning the lexer used by a
  grammar. Also added a field in Token.glexer type to ask lexers to
  record the locations of the comments.
- [04 Nov 02] Added option -no_quot with normal syntax (pa_o.cmo):
  don't parse quotations (it allows to use e.g. <:> as a valid token).
- [31 Oct 02] Added pa_macro.cmo (to replace pa_ifdef.cmo which is
  kept for compatibility, but deprecated). The extended statements
  allow de definitions of macros and conditional compilation like
  in C.
- [29 Oct 02] Changed pretty printers of the three main syntaxes: if
  the locations of input are not correct, do no more raise End_of_file
  when displaying the inter-phrases (return: the input found up to eof
  if not empty, otherwise the value of the -sep parameter if not empty,
  otherwise the string "\n").
- [25 Oct 02] Added option -records in pa_sml.cmo: generates normal
  OCaml records instead of objects (the user must be sure that there
  are no names conflicts).
- [22 Oct 02] Added Plexer.specific_space_dot: when set to "true", the
  next call to Plexer.gmake returns a lexer where the dot preceded by
  spaces (space, tab, newline, etc.) return a different token than when
  not preceded by spaces.
- [19 Oct 02] Added printer in Scheme syntax: pr_scheme.cmo and the
  extension pr_schemep.cmo which rebuilts parsers.
- [15 Oct 02] Now, in case of syntax error, the real input file name is
  displayed (can be different from the input file, because of the possibility
  of line directives, typically generated by /lib/cpp).
  Changed interface of Stdpp.line_of_loc: now return also a string: the name
  of the real input file name.
- [14 Oct 02] Fixed bug in normal syntax (pa_o.cmo): the constructors
  with currification of parameters (C x y) were accepted.
- [14 Oct 02] Fixed many problems of make under Windows (in particular if
  installations directories contain spaces).
- [11 Oct 02] In ocaml syntax (pa_o.cmo), fixed 3 bugs (or incompatibilities
  with the ocaml yacc version of the compiler): 1/ "ref new foo" was
  interpreted as "ref;; new foo" instead of "ref (new foo)" 2/ unary
  minuses did not work correctly (nor in quotation of syntax trees), in
  particular "-0.0" 3/ "begin end" was a syntax error, instead of being "()".
- [Sep-Oct 02] Many changes and improvements in Scheme syntax.
- [07 Oct 02] Added definition of Pcaml.type_declaration which is
  now visible in the interface, allowing to change the type declarations.
- [07 Oct 02] Added Pcaml.syntax_name to allow syntax extensions to test
  it and take different decision. In revised syntax, its value is "Revised",
  in normal syntax "OCaml" and in Scheme syntax "Scheme".
- [03 Oct 02] Added lexing of '\xHH' where HH is hexadecimal number.
- [01 Oct 02] In normal syntax (camlp4o), fixed problem of lexing
  comment: (* bleble'''*)
- [23 Sep 02] Fixed bug: input "0x" raised Failure "int_of_string"
  without location (syntaxes pa_o and pa_r).
- [14 Sep 02] Added functions Grammar.iter_entry and Grammar.fold_entry
  to iterate a grammar entry and transitively all the entries it calls.
- [12 Sep 02] Added "Pcaml.rename_id", a hook to allow parsers to give
  ability to rename their identifiers. Called in Scheme syntax (pa_scheme.ml)
  when generating its identifiers.
- [09 Sep 02] Fixed bug under toplevel, the command:
     !Toploop.parse_toplevel_phrase (Lexing.from_buff "1;;");;
  failed "End_of_file".
- [06 Sep 02] Added "Pcaml.string_of". Combined with Pcaml.pr_expr,
  Pcaml.pr_patt, and so on, allow to pretty print syntax trees in string.
  E.g. in the toplevel:
        # #load "pr_o.cmo";
        # Pcaml.string_of Pcaml.pr_expr <:expr< let x = 3 in x + 2 >>;;
        - : string = "let x = 3 in x + 2"

Camlp4 Version 3.06
--------------------

- [24 Jul 02] Added Scheme syntax: pa_scheme.ml, camlp4sch.cma (toplevel),
  camlp4sch (command).

Camlp4 Version 3.05
-----------------------

- [12 Jul 02] Better treatment of comments in option -cip (add comments
  in phrases) for both printers pr_o.cmo (normal syntax) and pr_r.cmo
  (revised syntax); added comments before let binding and class
  structure items; treat comments inside sum and record type definitions;
  the option -tc is now deprecated and equivalent to -cip.
- [13 Jun 02] Added pa_lefteval.cmo: add let..in expressions to guarantee
  left evaluation of functions parameters, t-uples, and so on (instead of
  the default non-specified-but-in-fact-right-to-left evaluation).
- [06 Jun 02] Changed revised syntax (pa_r) of variants types definition;
  (Jacques Garrigue's idea):
        old syntax      new syntax
        [| ... |]       [ = ... ]
        [| < ... |]     [ < ... ]     
        [| > ... |]     [ > ... ]     
  This applies also in predefined quotations of syntax tree for types
  <:ctyp< ... >>
- [05 Jun 02] Added option -ss in pr_o.cmo: print with double semicolons;
  and the option -no_ss is now by default.
- [30 May 02] Improved SML syntax (pa_sml).
- [30 May 02] Changed the AST for the "with module" construct (was with
  type "module_type"; changed into type "module_expr").
- [26 May 02] Added missing abstract module types.
- [21 Apr 02] Added polymorphic types for polymorphic methods:
      revised syntax (example): ! 'a 'b . type
      ctyp quotation: <:ctyp< ! $list:pl$ . $t$ >>
- [17 Apr 02] Fixed bug: in normal syntax (pa_o.cmo) made a parse error on
  the "dot" on (in interface file file):
       class c : a * B.c  -> object val x : int end
- [03 Apr 02] Fixed bug: (* "(*" *) resulted in "comment not terminated".
- [03 Apr 02] Fixed incompatibility with ocaml: ''' and '"' must be
  displayed as '\'' and '\"' in normal syntax printer (pr_o.cmo).
- [03 Apr 02] When there are several tokens parsed together (locally LL(n)),
  the location error now highlights all tokens, resulting in a more clear
  error message (e.g. "for i let" would display "illegal begin of expr"
  and highlight the 3 tokens, not just "for").
- [30 Mar 02] Added pa_extfold.cmo extending pa_extend.cmo by grammar
  symbols FOLD0 and FOLD1. Work like LIST0 and LIST1 but have two initial
  parameters: a function of type 'a -> 'b -> 'b doing the fold and an
  initial value of type 'b. Actually, LIST0 now is like
     FOLD0 (fun x y -> x :: y) []
  with an reverse of the resulting list.
- [20 Mar 02] Fixed problem: when running a toplevel linked with camlp4
  as a script, the camlp4 welcome message was displayed.
- [14 Mar 02] The configure shell and the program now test the consistency
  of OCaml and Camlp4. Therefore 1/ if trying to compile this version with
  an incompatible OCaml version or 2/ trying to run an installed Camlp4 with
  a incompatible OCaml version: in both cases, camlp4 fails.
- [14 Mar 02] When make opt.opt is done, the very fast version is made for
  the normal syntax ("compiled" version). The installed camlp4o.opt is that
  version.
- [05 Mar 02] Changed the conversion to OCaml syntax tree for <:expr< x.val >>
  and <:expr< x.val := e >> which generates now the tree of !x and x := e,
  no more x.contents and x.contents <- e. This change was necessary because
  of a problem if a record has been defined with a field named "contents".

- [16 Feb 02] Changed interface of grammars: the token type is now
  customizable, using a new lexer type Token.glexer, parametrized by
  the token type, and a new functor GMake. This was accompanied by
  some cleanup. Become deprecated: the type Token.lexer (use Token.glexer),
  Grammar.create (use Grammar.gcreate), Unsafe.reinit_gram (use
  Unsafe.gram_reinit), the functor Grammar.Make (use Grammar.GMake).
  Deprecated means that they are kept during some versions and removed
  afterwards.
- [06 Feb 02] Added missing infix "%" in pa_o (normal syntax).
- [06 Feb 02] Added Grammar.print_entry printing any kind of (obj) entry
  and having the Format.formatter as first parameter (Grammar.Entry.print
  and its equivalent in functorial interface call it).
- [05 Feb 02] Added a flag Plexer.no_quotations. When set to True, the
  quotations are no more lexed in all lexers built by Plexer.make ()
- [05 Feb 02] Changed the printing of options so that the option -help
  aligns correctly their documentation. One can use now Pcaml.add_option
  without having to calculate that.
- [05 Feb 02] pr_r.cmo: now the option -ncip (no comments in phrases) is
  by default, because its behaviour is not 100% sure. An option -cip has
  been added to set it.
- [03 Feb 02] Added function Stdpp.line_of_loc returning the line and
  columns positions from a character location and a file.
- [01 Feb 02] Fixed bug in token.ml: the location function provided by
  lexer_func_of_parser, lexer_func_of_ocamllex and make_stream_and_location
  could raise Invalid_argument "Array.make" for big files if the number
  of read tokens overflows the maximum arrays size (Sys.max_array_length).
  The bug is not really fixed: in case of this overflow, the returned
  location is (0, 0) (but the program does not fail).
- [28 Jan 02] Fixed bug in pa_o when parsing class_types. A horrible hack
  had to be programmed to be able to treat them correctly.
- [28 Jan 02] Fixed bug in OCaml toplevel when loading camlp4: the directives
  were not applied in the good order.
- [26 Jan 02] The printer pr_extend.cmo try now also to rebuild GEXTEND
  statements (before it tried only the EXTEND).
- [23 Jan 02] The empty functional stream "fstream [: :]" is now of type
  'a Fstream.t thanks to the new implementation of lazies allowing to
  create polymorphic lazy values.
- [11 Jan 02] Added a test in grammars using Plexer that a keyword is not
  used also as parameter of a LIDENT or a UIDENT.
- [04 Jan 02] Fixed bug in pa_sml (SML syntax): the function definitions
  with several currified parameters did not work. It works now, but the
  previous code was supposed to treat let ("fun" in SML syntax) definitions
  of infix operators, what does not work any more now.
- [04 Jan 02] Alain Frisch's contribution:
  Added pa_ocamllex.cma, syntax for ocamllex files. The command:
      camlp4 pa_ocamllex.cmo pr_o.cmo -ocamllex -impl foo.mll > foo.ml
  does the same thing as:
      ocamllex foo.mll
  Allow to compile directly mll files. Without option -ocamllex, allow
  to insert lex rules in a ml file.
- [29 Dec 01] Added variable "inter_phrases" in Pcaml, of type ref (option
  string) to specify the string to print between phrases in pretty printers.
  The default is None, meaning to copy the inter phrases from the source
  file.

Camlp4 Version 3.04
-------------------

- [07 Dec 01] Added Pcaml.parse_interf and Pcaml.parse_implem, hooks to
  specify the parsers tof use, i.e. now can use other parsing technics
  than the Camlp4 grammar system.
- [27 Nov 01] Fixed functions Token.eval_char and Token.eval_string which
  returned bad values, resulting lexing of backslash sequences incompatible
  with OCaml (e.g. "\1" returned "\001" (one character) but OCaml returns
  the string of the two characters \ and 1).
- [15 Nov 01] In revised syntax, in let binding in sequences, the "in"
  can be replaced by a semicolon; the revised syntax printer pr_r.cmo
  now rather prints a semicolon there.
- [07 Nov 01] Added the ability to use $ as token: was impossible so far,
  because of AST quotation uses it for its antiquotation. The fix is just
  a little (invisible) change in Plexer.
- [05 Nov 01] Added option -tc (types comment) when using pr_o or pr_r
  try to print comments inside sum and record types like they are in
  the source (not by default, because may work incorrectly).
- [05 Nov 01] Added option -ca (comment after) when using pr_o or pr_r:
  print ocamldoc comments after the declarations, when they are before.
- [04 Nov 01] Added locations for variants and labels declarations in AST
  (file MLast.mli).
- [03 Nov 01] In pretty printers pr_o and pr_r, skip to next begin of line
  when displaying the sources between phrase, to prevent e.g. the displaying
  of the possible last comment of a sum type declaration (the other comment
  being not displayed anyway).
- [24 Oct 01] Fixed incorrect locations in sequences.
- [24 Oct 01] Was erroneously compiled by the OCaml boot compiler instead
  of the generated ocamlc. Fixed.
- [15 Oct 01] Fixed some parsing differences between pa_o and ocamlyacc:
  in parsers, in labels.
- [12 Oct 01] Added missing bigarray syntax a.{b} (and Cie) in standard
  syntax (pa_o).

Camlp4 Version 3.03
-------------------

- [09 Oct 01] Fixed bug: the token !$ did not work. Fixed and completed
  some syntaxes of labels patterns. Added missing case in exception
  declaration (exception rebinding).
- [05 Oct 01] Fixed bug in normal syntax: when defining a constructor
  named "True" of "False" (capitalized, i.e. not like the booleans), it
  did not work.
- [04 Oct 01] Fixed some revised and quotation syntaxes in objects classes
  and types (cleaner). Cleaned up also several parts of the parsers.
- [02 Oct 01] In revised syntax, the warning for using old syntax for
  sequences is now by default. To remove it, the option -no-warn-seq
  of camlp4r has been added. Option -warn-seq has been removed.
- [07 Sep 01] Included Camlp4 in OCaml distribution.
- [06 Sep 01] Added missing pattern construction #t
- [05 Sep 01] Fixed bug in pa_o: {A.B.c = d} was refused.
- [26 Aug 01] Fixed bug: in normal and revised syntaxes, refused -1.0
  (minus float) as pattern.
- [24 Aug 01] Fixed bug: (a : b :> c) and ((a : b) :> c) were parsed
  identically.
- [20 Aug 01] Fixed configure script for Windows configuration.
- [10 Aug 01] Fixed bug: <:expr< 'a' >> did not work because of a typing
  problem.
- [10 Aug 01] Fixed bug in compilation process under Windows: the use of
  the extension .exe was missing in several parts in Makefiles and shell
  scripts.
- [09 Aug 01] Changed message error in grammar: in the case when the rule
  is: ....; tok1; tok2; .. tokn; ... (n terminal tokens following each other),
  where the grammar is locally LL(n), it displays now:
      tok1 tok2 .. tokn expected
  instead of just
      tok1 expected
  because "tok1" can be correct in the input, and in this case, the message
  underscored the tok1 and said "tok1 expected".
- [07 Aug 01] When camlp4r.cma is loaded in the toplevel, the results are
  now displayed in revised syntax.
- [04 Aug 01] Added syntax "declare..end" in quotations class_str_item and
  class_sig_item to be able to generate several items from one only item
  (like in str_item and sig_item).

Camlp4 Version 3.02
-------------------

- [21 Jul 01] Fixed bug: <:expr< { l = x } >> was badly built and resulted
  in a typing error.
- [13 Jul 01] Fixed bug: did not accept floats in patterns.
- [11 Jul 01] Added function Pcaml.top_printer to be able to use the
  printers Pcaml.pr_expr, Pcaml.pr_patt, and so on for the #install_printer
  of OCaml toplevel. Ex:
      let f = Pcaml.top_printer Pcaml.pr_expr;;
      #install_printer f;;
      #load "pr_o.cmo";;
- [24 Jun 01] In grammars, added symbol ANY, returning the current token,
  whichever it is.
- [24 Jun 01] In grammars, a rule list of the form [ s1 | s2 | .. | sn ]
  is interpreted as [ x = s1 -> x | x = s2 -> x | .. x = sn -> x ]
  instead of [ _ = s1 -> () | _ = s2 -> () .. ]
- [24 Jun 01] Moved the functions [Plexer.char_of_char_token] and
  [Plexer.string_of_string_token] into module [Token] with names
  [Token.eval_char] and [Token.eval_string].
- [22 Jun 01] Added warning when using old syntax for sequences, while
  and do (do..return, do..done) in predefined quotation expr.
- [22 Jun 01] Changed message for unbound quotations (more clear).

Camlp4 Version 3.01.6:
----------------------

- [22 Jun 01] Changed the module Pretty into Spretty.
- [21 Jun 01] Camlp4 can now be compiled even if OCaml is not installed:
  in the directory "config", the file "configure_batch" is a possibility
  to configure the compilation (alternative of "configure" of the top
  directory) and has a parameter "-ocaml-top" to specify the OCaml top
  directory (relative to the camlp4/config directory).
- [21 Jun 01] The interactive "configure" now tests if the native-code
  compilers ocamlc.opt and ocamlopt.opt are accessible and tell the
  Makefile to preferably use them if they are.
- [16 Jun 01] The syntax tree for strings and characters now represent their
  exact input representation (the node for characters is now of type string,
  no more char). For example, the string "a\098c" remains "a\098c" and is
  *not* converted into (the equivalent) "abc" in the syntax tree. The
  convertion takes place when converting into OCaml tree representation.
  This has the advantage that the pretty print now display them as they
  are in the input file. To convert from input to real representation
  (if needed), two functions have been added: Plexer.string_of_string_token
  and Plexer.char_of_char_token.
- [10 Jun 01] In revised syntax, added ability to write {foo x = y} as short
  form for {foo = fun x -> y}.
- [08 Jun 01] Completed missing cases in pa_extfun.cmo for variants.
- [06 Jun 01] Completed missing cases in abstract syntax tree and in normal
  syntax parser pa_o.ml (about classes).
- [06 Jun 01] Fixed bug in pa_o.cmo (parser of normal syntax): (~~) did not
  work, and actually all prefix operators between parentheses.

Camlp4 Version 3.01.5:
----------------------

- [04 Jun 01] Fixed bug: when using "include" in a structure item the rest
  of the structure was lost.
- [31 May 01] Added ability to user #load and #directory inside ml or mli
  files to specify a cmo file to be loaded (for syntax extension) or the
  directory path (like option -I). Same semantics than in toplevel.
- [29 May 01] The name of the location variable used in grammars (action
  parts of the rules) and in the predefined quotations for OCaml syntax
  trees is now configurable in Stdpp.loc_name (string reference). Added also
  option -loc to set this variable. Default: loc.
- [26 May 01] Added functional streams: a library module Fstream and a syntax
  kit: pa_fstream.cmo. Syntax:
      streams: fstream [: ... :]
      parsers: fparser [ [: ... :] -> ... | ... ]
- [25 May 01] Added function Token.lexer_func_of a little bit more general
  than Token.lexer_func_of_parser.

Camlp4 Version 3.01.4:
----------------------

- [20 May 01] Fixed bug: pr_rp and pr_op could generate bound variables
  resulting incorrect program:
  (e.g. fun s -> parser [: `_; x :] -> s x was printed:
        fun s -> parser [: `_; s :] -> s s)
- [19 May 01] Small improvement in pretty.ml resulting a faster print (no
  more stacked HOVboxes which printers pr_r and pr_o usually generate in
  expr, patt, ctyp, etc.)
- [18 May 01] Added [lexer_func_of_parser] and [lexer_func_of_ocamllex]
  in module [Token] to create lexers functions from char stream parsers
  or from [ocamllex] lexers.
- [16 May 01] Pretty printing with pr_r.cmo (revised syntax) now keep
  comments inside phrases.
- [15 May 01] Changed pretty printing system, using now new extensible
  functions of Camlp4.
- [15 May 01] Added library module Extfun for extensible functions,
  syntax pa_extfun, and a printer pr_extfun.
- [12 May 01] Fixed bug: missing cases in pr_o and pr_r for in cases of
  "for", "while", and some other expressions, when between parentheses.

Camlp4 Version 3.01.3:
----------------------

- [04 May 01] Put back the syntax "do ... return ..." in predefined
  quotation "expr", to be able to compile previous programs. Work
  only if the quotation is in position of expression, not in pattern.
- [04 May 01] Added lisp syntax pa_lisp.cmo (not terminated).
- [01 May 01] Fixed bug: in toplevel, in case of syntax error in #use,
  the display was incorrect: it displayed the input, instead of the
  file location.

Camlp4 Version 3.01.2:
----------------------

- [27 Apr 01] Added variable Grammar.error_verbose and option -verbose of
  command camlp4 to display more information in case of parsing error.
- [27 Apr 01] Fixed bug: the locations in sequences was not what expected
  by OCaml, resulting on bad locations displaying in case of typing error.
- [27 Apr 01] Fixed bug: in normal syntax, the sequence was parsed
  of left associative instead of right associative, resulting bad pretty
  printing.

Camlp4 Version 3.01.1:
----------------------

- [19 Apr 01] Added missing new feature "include" (structure item).
- [17 Apr 01] Changed revised syntax of sequences. Now:
       do { expr1; expr2 ..... ; exprn }
       for patt = expr to/downto expr do { expr1; expr2 ..... ; exprn }
       while expr do { expr1; expr2 ..... ; exprn }
  * If holding a "let ... in", the scope applies up to the end of the sequence.
  * The old syntax "do .... return ..." is still accepted.
  * In expr quotation, it is *not* accepted. To ensure backward
    compatibility, use ifdef NEWSEQ, which answers True from this version.
  * The printer pr_r.cmo by default prints with this new syntax.
  * To print with old syntax, use option -old_seq.
  * To get a warning when using old syntax, use option -warn_seq.

Camlp4 Version 3.01:
--------------------

- [5 Mar 01] In pa_o.ml fixed problem, did not parse:
       class ['a, 'b] cl a b : ['a, 'b] classtype
- [9 Oct 00] Raise now Stream.Error when parsing with an empty entry (meaning
  that the user probably forgot to initialize it).
- [21 Jul 00] Fixed (pr_o.cmo) pb of bad printing of
     let (f : unit -> int) = fun () -> 1
- [10 Jun, 21 Jul 00] Added Pcaml.sync to synchronize after syntax error in
  toplevel.
- [24 May 00] Changed the "make opt", returning to what was done in the
  previous releases, i.e. just the compilation of the library (6 files).
  The native code compilation of "camlp4o" and "camlp4r" are not absolutely
  necessary and can create problems in some systems because of too long code.
  The drawbacks are more important than the advantages.
- [19 May 00] Changed option -split_gext (when pa_extend.cmo is loaded) into
  -split_ext: it applies now also for non functorial grammars (extended by
  EXTEND instead of GEXTEND).
- [12 May 00] Fixed problem in pr_rp.cmo and pr_op.cmo: the pretty printing
  of the construction "match x with parser" did not work (because of the
  type constraint "Stream.t _" added some versions ago).

Camlp4 Version 3.00:
--------------------

- [Apr 19, 00] Added "pa_olabl" for labels with old Olabl syntax.
- [Apr 18, 00] Make opt now builds camlp4o.opt and camlp4r.opt
- [Apr 17, 00] Added support for labels and variants.
- [Mar 28, 00] Improved the grammars: now the rules starting with n
  terminals are locally LL(n), i.e. if any of the terminal fails, it is
  not Error but just Failure. Allows to write the Ocaml syntax case:
        ( operator )
        ( expr )
  with the problem of "( - )" as:
        "("; "-"; ")"
        "("; operator; ")"
        "("; expr; ")"
  after factorization of the "(", the rule "-"; ")" is locally LL(2): it
  works for this reason. In the previous implementation, a hack had to be
  added for this case.

  To allow this, the interface of "Token" changed. The field "tparse" is
  now of type "pattern -> option (Stream.t t -> string)" instead of
  "pattern -> Stream.t t -> string". Set it to "None" for standard pattern
  parsing (or if you don't know).

Camlp4 Version 2.04:
--------------------

- [Nov 23, 99] Changed the module name Config into Oconfig, because of
  conflict problem when applications want to link with the module Config of
  Ocaml.

Camlp4 Version 2.03:
--------------------

* pr_depend:
  - [Jun 25, 99] Added missing case in "pr_depend.cmo": pattern A.B.C.
  - [Jun 5, 99] Fixed in "pr_depend.ml" case expression "Foo.Bar" displaying a
    bad dependency with file "bar.ml" if existed. And changed "pa_r.ml"
    (revised syntax parsing) to generate a more logical ast for case
    "var.Mod.lab".
  - [Apr 29, 99] Added missing cases in "pr_o.cmo" and in "pr_depend.cmo".
  - [Mar 11, 99] Added missing cases in "pr_depend.cmo".
  - [Mar 9, 99] Added missing case in pr_depend.ml.

* Other:
  - [Sep 10, 99] Updated from current Ocaml new interfaces.
  - [Jul 9, 99] Added stream type constraint in pa_oop.ml to reflect the same
    change in Ocaml.
  - [Jun 24, 99] Added missing "constraint" construction in types
  - [Jun 15, 99] Added option -I for command "mkcamlp4".
  - [May 14, 99] Added man pages (links) for camlp4o, camlp4r, mkcamlp4, ocpp
  - [May 10, 99] Added shell script "configure_batch" in directory "config".
  - [May 10, 99] Changed LICENSE to BSD.
  - [Apr 29, 99] Added "ifdef" for mli files.
  - [Apr 11, 99] Changed option "-no_cp" into "-sep" in pr_r.cmo and pr_o.cmo.
  - [Apr 11, 99] Fixed (old) bug: too long strings where bad pretty printed.
  - [Mar 24, 99] Added missing stream type constraint for parsers.
  - [Mar 17, 99] Changed template Makefile to use ocamlc.opt and ocamlopt.opt
    by default, instead of ocamlc and ocamlopt.
  - [Mar 9, 99] Added ifndef in pa_ifdef.ml.
  - [Mar 7, 99] Completed and fixed some cases in pr_extend.ml.

Camlp4 Version 2.02:
--------------------

* Parsing:
  - [Feb 27, 99] Fixed 2 bugs, resulting of incorrect Ocaml parsing of the
    program example: "type t = F(B).t"
  - [Jan 30, 99] Fixed bug "pa_op.ml", could not parse "parser | [<>] -> ()".
  - [Jan 16, 99] Added "define" and "undef" in "pa_ifdef.cmo".
  - [Dec 22, 98] Fixed precedence of "!=" in Ocaml syntax

* Printing:
  - [Mar 4, 99] Added pr_depend.cmo for printing file dependencies.
  - [Dec 28, 98] Fixed pretty printing of long strings starting with spaces;
    used to display "\\n<spaces>..." instead of "<spaces>\\n...".

* Camlp4:
  - [Feb 19, 99] Sort command line argument list in reverse order to
    avoid argument names conflicts when adding arguments.

* Olabl:
  - [Feb 26, 99] Started extensions for Olabl: directory "lablp4" and some
    changes in MLast. Olabl programs can be preprocessed by:
        camlp4 pa_labl.cma pr_ldump.cmo

* Internal:
  - Use of pr_depend.cmo instead of ocamldep for dependencies.

Camlp4 Version 2.01:
--------------------

Token interface
* Big change: the type for tokens and tokens patterns is now (string * string)
  the first string being the constructor name and the second its possible
  parameters. No change in EXTEND statements using Plexer. But lexers
  have:
  - a supplementary parameter "tparse" to specify how to parse token
    from token patterns.
  - fields "using" and "removing" replacing "add_keyword" and
    "remove_keyword".
  See the file README-2.01 for how to update your programs and the interface
  of Token.

Grammar interface
* The function "keywords" have been replaced by "tokens". The equivalent
  of the old statement:
       Grammar.keywords g
  is now:
       Grammar.tokens g ""

Missing features added 
* Added "lazy" statement (pa_r.cmo, pa_o.cmo, pr_r.cmo, pr_o.cmo)
* Added print "assert" statement (pr_o.cmo, pr_r.cmo)
* Added parsing of infix operators like in Ocaml (e.g. |||) in pa_o.cmo

Compilation
* Added "make scratch"
* Changed Makefile. No more "make T=../", working bad in some systems.
* Some changes to make compilation in Windows 95/98 working better (thanks
  to Patricia Peratto).

Classes and objects
* Added quotations for classes and objects (q_MLast.ml)
* Added accessible entries in module Pcaml (class_type, class_expr, etc.)
* Changed classes and objects types in definition (module MLast)

Miscelleneous
* Some adds in pa_sml.cmo. Thanks to Franklin Chen.
* Added option "-no_cp" when "pr_o.cmo" or "pr_r.cmo" is loaded: do
  not print comments between phrases.
* Added option "-split_gext" when "pa_extend.cmo" is loaded: split GEXTEND
  by functions to turn around a PowerPC problem.

Bug fixes
* Fixed pa_r.cmo, pa_o.cmo to parse, and pr_r.cmo, pr_o.cmo to print "(x:#M.c)"
* Fixed printing pr_o.cmo of "(a.b <- 1)::1"
* Extended options with parameters worked only when the parameter was sticked.
  Ex:
     camlp4o pr_o.cmo -l120 foo.ml
  worked, but not:
     camlp4o pr_o.cmo -l 120 foo.ml

Camlp4 Version 2.00:
--------------------

* Designation "righteous" has been renamed "revised".
* Added class and objects in Ocaml printing (pr_o.cmo), revised parsing
  (pa_r.cmo) and printing (pr_r.cmo).
* Fixed bug in Ocaml syntax: let _, x = 1, 2;; was refused.

Camlp4 Version 2.00--1:
-----------------------

* Added classes and objects in Ocaml syntax (pa_o.cmo)
* Fixed pr_r.cmo et pr_r.cmo which wrote on stdout, even when option -o

Camlp4 Version 2.00--:
----------------------

* Adapted for Ocaml 2.00.
* No objects and classes in this version.

* Added "let module" parsing and printing.
* Added arrays patterns parsing and printing.
* Added records with "with" "{... with ...}" parsing and printing

* Added # num "string" in plexer (was missing).
* Fixed bug in pr_o.cmo: module A = B (C);; was printed module A = B C;;
* Added "pa_sml.cmo", SML syntax + "lib.sml"
* Fixed bug in pa_r.ml and pa_o.ml: forgot to clear let_binding
* Changed Plexer: unknown keywords do not raise error but return Tterm
* q_MLast.cmo: suppressed <:expr< [$list:el$] >> (cannot work)
* Added option "-no_ss" (no ;;) when "pr_o.cmo" loaded
* Many changes and bug fixing in pretty printing pr_o.cmo and pr_r.cmo
* Command ocpp works now without having to explicitely load
  "/usr/local/lib/ocaml/stdlib.cma" and
  "/usr/local/lib/camlp4/gramlib.cma"

* Fixed problem of pretty print "&" and "or" in normal and righteous syntaxes
* Added missing statement "include" in signature item in normal and righteous
  syntaxes
* Changed precedence of ":=" and "<-" in normal syntax (pa_o et pr_o):
  now before "or", like in Ocaml compiler.
* Same change in righteous syntax, by symmetry.

Camlp4 Version 1.07.2:
----------------------

Errors and missings in normal and righteous syntaxes.

* Added forgotten syntax (righteous): type constraints in class type fields.
* Added missing syntax (normal): type foo = bar = {......}
* Added missing syntax (normal): did not accept separators before ending
  constructions (many of them).
* Fixed bug: "assert false" is now of type 'a, like in Ocaml.
* Fixed to match Ocaml feature: "\^" is "\^" in Ocaml, but just "^" in Camlp4.
* Fixed bug in Windows NT/95: problem in backslash before newlines in strings

Grammars, EXTEND, DELETE_RULE

* Added functorial version for grammars (started in version 1.07.1, 
  completed in this version).
* Added statements GEXTEND and GDELETE_RULE in pa_extend.cmo for functorial
  version.
* EXTEND statement is added AFTER "top" instead of LEVEL "top" (because
  of problems parsing "a; EXTEND...")
* Added ability to have expressions (in antiquotation form) of type string in
  EXTEND after keywords "LIDENT", "UIDENT", "IDENT", "ANTIQUOT", "INT" as
  in others constructions inside EXTEND.
* A grammar rule hidden by another is not deleted but just masked. DELETE_RULE
  will restore the old version.
* DELETE_RULE now raises Not_found if no rule matched.
* Fixed bug: DELETE_RULE did not work when deleting a rule which is a prefix of
  another rule.
* Some functions for "system use" in [Grammar] become "official":
  [Entry.obj], [extend], [delete_rule].

Command line, man page

* Added option -o: output on file instead of standard output, necessary
  to allow compilation in Windows NT/95 (in fact, this option exists since
  1.07.1 but forgotten in its "changes" list).
* Command line option -help more complete.
* Updated man page: camlp4 options are better explained.
* Fixed bug: "camlp4 [other-options] foo.ml" worked but not
  "camlp4 foo.ml [other-options]".
* Fixed bug: "camlp4 foo" did not display a understandable error message.

Camlp4's compilation

* Changes in compilation process in order to try to make it work better for
  Windows NT under Cygnus.

Miscellaneous

* Added [Pcaml.add_option] for adding command line options.

Camlp4 Version 1.07.1:
----------------------

* Added forgotten syntax in pr_o: type x = y = A | B
* Fixed bug negative floats parsing in pa_o => error while pretty printing
* Added assert statement and option -noassert.
* Environment variable CAMLP4LIB to change camlp4 library directory
* Grammar: empty rules have a correct location instead of (-1, -1)
* Compilation possible in Windows NT/95
* String constants no more shared while parsing Ocaml
* Fixed bug in antiquotations in q_MLast.cmo (bad errors locations)
* Fixed bug in antiquotations in q_MLast.cmo (EOI not checked)
* Fixed bug in Plexer: could not create keywords with iso 8859 characters

Camlp4 Version 1.07:
--------------------

* Changed version number + configuration script
* Added iso 8859 uppercase characters for uidents in plexer.ml
* Fixed bug factorization IDENT in grammars
* Fixed bug pr_o.cmo was printing "declare"
* Fixed bug constructor arity in Ocaml syntax (pa_o.cmo).
* Changed "lazy" into "slazy".
* Completed pa_ifdef.cmo.

Camlp4 Version 1.06:
--------------------

* Adapted to Ocaml 1.06.
* Changed version number to match Ocaml's => 1.06 too.
* Deleted module Gstream, using Ocaml's Stream.
* Generate different AST for C(x,y) and C x y (change done in Ocaml's compiler)
* No more message "Interrupted" in toplevel in case of syntax error.
* Added flag to suppress warnings while extending grammars.
* Completed some missing statements and declarations (objects)
* Modified odyl implementation; works better
* Added ability to extend command line specification
* Added "let_binding" as predefined (accessible) entry in Pcaml.
* Added construction FUNCTION in EXTEND statement to call another function.
* Added some ISO-8859-1 characters in lexer identifiers.
* Fixed bug "value x = {val = 1};" (righteous syntax)
* Fixed bug "open A.B.C" was interpreted as "open B.A.C"
* Modified behavior of "DELETE_RULE": the complete rule must be provided
* Completed quotations MLast ("expr", "patt", etc) to accept whole language
* Renamed "LIKE" into "LEVEL" in grammar EXTEND
* Added "NEXT" as grammar symbol in grammar EXTEND
* Added command "mkcamlp4" to make camlp4 executables linked with C code
* Added "pr_extend.cmo" to reconstitute EXTEND instructions

Camlp4 Version 0.6:
-------------------

--- Installing

* To compile camlp4, it is no more necessary to have the sources of the
  Objective Caml compiler available. It can be compiled like any other
  Objective Caml program.

--- Options of "camlp4"

* Added option -where: "camlp4 -where" prints the name of the standard
  library directory of Camlp4 and exit. So, the ocaml toplevel and the
  compiler can use the option:
        -I `camlp4 -where`

* Added option -nolib to not search for objects files in the installed
  library directory of Camlp4.

--- Interface of grammar library modules

* The function Grammar.keywords returns now a list of pairs. The pair is
  composed of a keyword and the number of times it is used in entries.

* Changed interface of Token and Grammar for lexers, so user lexers have
  to be changed.

--- New features in grammars

* New instruction "DELETE_RULE" provided by pa_extend.cmo to delete rules.
  Ex:
     DELETE_RULE Pcaml.expr: "if" END;
  deletes the "if" instruction of the language.

* Added the ability to parse some specific integer in grammars: a possible
  parameter to INT, like the ones for LIDENT and UIDENT.

* In instruction EXTEND, ability to omit "-> action", default is "-> ()"

* Ability to add antiquotation (between $'s) as symbol rule, of type string,
  interpreted as a keyword, in instruction EXTEND.

* Ability to put entries with qualified names (Foo.bar) in instruction EXTEND.

--- Quotations

* The module Ast has been renamed MLast. The quotation expander "q_ast.cmo"
  has been renamed "q_MLast.cmo".

* Quotation expanders are now of two kinds:
  - The "classical" type for expanders returning a string. These expanders
    have now a supplementary parameter: a boolean value set to "True"
    when the quotation is in a context of an expression an to "False"
    when the quotation is in a context of a pattern. These expanders,
    returning strings which are parsed afterwards, may work for some
    language syntax and/or language extensions used (e.g. may work for
    Righteous syntax and not for Ocaml syntax).
  - A new type of expander returning directly syntax trees. A pair
    of functions, for expressions and for patterns must be provided.
    These expanders are independant from the language syntax and/or
    extensions used.

* The predefined quotation expanders "ctyp_", "patt_" and "expr_" has
  been deleted; one can use "ctyp", "patt", and "expr" in position of
  pattern or expression.

--- Ocaml and Righteous syntaxes

* Fixed bug: "open Foo.Bar" was converted (pr_dump.cmo) into "open Bar.Foo"

* Corrected behavior different from Ocaml's: "^" and "@" were at the same
  level than "=": now, like Ocaml, they have a separated right associative
  level.

--- Grammars behavior

* While extending entries: default position is now "extension of the
  first level", instead of "adding a new level at the end".

* Another Change: in each precedence level, terminals are inserted before
  other symbols (non terminals, lists, options, etc), LIDENT "foo" before
  LIDENT (alone) and UIDENT "foo" before UIDENT (alone). New rules not
  factorizable are now inserted before the other rules.

* Changed algorithm of entries parsing: each precedence level is tested
  against the stream *before* its next precedences levels (instead of
  *after*):
       EXTEND e: [[ LIDENT "a" -> "xxx" ] | [ i = LIDENT -> i ]]; END;
  Now, parsing the entry e with the string "a" returns "xxx" instead of "a"

* Less keywords in instruction EXTEND (LEFTA, LIDENT, etc), which can be
  used now as normal identifiers.

* When inserting a new rule, a warning appears if a rule with the
  same production already existed (it is deleted).

* Parse error messages (Gstream.Error) are formatted => spaces trigger
  Format.print_space and newlines trigger Format.force_newline.


Camlp4 Version 0.5:
-------------------

* Possible creation of native code library (make opt)

* Ocaml and Righteous Syntax more complete

* Added pa_ru.cmo for compiling sequences of type unit (Righteous)

* Quotations AST
  - No more quotation long_id
  - Antiquotations for identifiers more simple

* Lot of small changes


Camlp4 Version 0.4:
-------------------

* First distributed version