CHANGES.md 21.8 KB
Newer Older
1 2
# Changes

POTTIER Francois's avatar
POTTIER Francois committed
3
## 2017/XX/XX
POTTIER Francois's avatar
POTTIER Francois committed
4

POTTIER Francois's avatar
POTTIER Francois committed
5 6
* Changed Menhir's license from QPL to GPLv2.
  MenhirLib remains under LGPLv2, with a linking exception.
7

POTTIER Francois's avatar
POTTIER Francois committed
8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
* Moved the repository to
  [gitlab.inria.fr](https://gitlab.inria.fr/fpottier/menhir/).

* Introduced a new command line switch, `--cmly`, which causes Menhir to
  create a `.cmly` file, containing a description of the grammar and
  automaton. (Suggested by Frédéric Bour.)

* Introduced a new library, MenhirSdk, which allows reading a `.cmly` file.
  The purpose of this library is to allow external tools to take advantage
  of the work performed by Menhir's front-end. (Suggested by Frédéric Bour.)

* Introduced new syntax for attributes in a `.mly` file. Attributes are
  ignored by Menhir's back-ends, but are written to `.cmly` files, thus
  can be exploited by external tools via MenhirSdk. (Suggested by Frédéric Bour.)

23 24 25 26
* The definition of a %public nonterminal symbol can now be split into several
  parts within a single .mly file. (This used to be permitted only over
  multiple .mly files.) (Suggested by Frédéric Bour.)

POTTIER Francois's avatar
POTTIER Francois committed
27 28
* Improved the syntax error message that is displayed when a `.mly` file
  is incorrect: the previous and next token are shown.
29 30 31

* Fixed a bug where the module name `Basics` was shadowed (that is, if the user's
  project happened to contain a toplevel module by this name, then it could not
POTTIER Francois's avatar
POTTIER Francois committed
32
  be referred to from a `.mly` file). (Reported by François Thiré.)
33

34
## 2017/01/01
35 36 37 38 39

* Add `$MENHIR_STDLIB` as a way of controlling where Menhir looks for the file
  `standard.mly`. This environment variable overrides the installation-time
  default setting, and is itself overridden by the `--stdlib` command line
  switch. (Requested by Jonathan Protzenko.)
POTTIER Francois's avatar
POTTIER Francois committed
40

41 42 43
* `Makefile` fix: filter out `'\r'` in the output of `menhir --suggest-ocamlfind`,
  so that the `Makefile` works when Menhir is compiled as a Windows executable.
  (Suggested by Jonathan Protzenko.)
44

45
## 2016/12/01
46 47 48

* Updated the Coq back-end for compatibility with Coq 8.6.
  (Jacques-Henri Jourdan.)
POTTIER Francois's avatar
POTTIER Francois committed
49

50
## 2016/11/15
51 52 53 54 55 56

* Fix in `--only-preprocess-for-ocamlyacc` mode: avoid printing newline characters
  inside a `%type` declaration, as this is forbidden by `ocamlyacc`. (Reported by
  Kenji Maillard.)
* Fix in `--only-preprocess-for-ocamlyacc` mode: avoid variable capture caused by
  `ocamlyacc` internally translating `$i` to `_i`. (Reported by Kenji Maillard.)
57

58
## 2016/09/01
59 60 61 62 63

* New command line switch `--only-preprocess-for-ocamlyacc`, supposed to print the
  grammar in a form that `ocamlyacc` can accept. As of now, this feature is
  incomplete (in particular, support for Menhir's position keywords is missing),
  untested, and undocumented. It could be removed in the future.
POTTIER Francois's avatar
POTTIER Francois committed
64

65
## 2016/08/26
66 67

* Fixes in the output of `--only-preprocess`:
68 69 70 71
  * The order of productions is now preserved.
      (It was not. This matters if there are reduce/reduce conflicts.)
  * `%parameter` directives are now printed. (They were not).
  * `%on_error_reduce` directives are now printed. (They were not.)
72

73
## 2016/08/25
74 75 76 77

* `Makefile` fix, undoing a change made on 2016/03/03, which caused installation
  to fail under (some versions of?) Windows where dynamic linking is not
  supported. (Reported by Andrew Appel.)
78

79
## 2016/08/05
80 81 82 83 84

* `%on_error_reduce` declarations now have implicit priority levels, so as to
  tell Menhir what to do when two such declarations are applicable.
  Also, the well-formedness checks on `%type` and `%on_error_reduce` declarations
  have been reinforced.
POTTIER Francois's avatar
POTTIER Francois committed
85

86
## 2016/06/23
87 88 89 90 91 92

* A small change in the generated code (both in the code and table back-ends) so
  as to avoid OCaml's warning 41. The warning would arise (when compiling a
  generated parser with OCaml 4.03) because Menhir's exception `Error` has the
  same name as the data constructor `Error` in OCaml's pervasive library.
  (Reported by Bernhard Schommer.)
93

94
## 2016/05/18
95 96 97 98 99

* Anonymous rules now work also when used inside a parameterized rule.
  (This did not work until now.) When an anonymous rule is hoisted out
  of a parameterized rule, it may itself become parameterized. Menhir
  parameterizes it only over the parameters that it actually needs.
100

101
## 2016/05/04
102 103 104 105 106

* In the Coq backend, split the largest definitions into smaller
  ones. This circumvents a limitation of vm_compute on 32 bit
  machines. This also enables us to perform sharing between
  definitions, so that the generated files are much smaller.
Jacques-Henri Jourdan's avatar
Jacques-Henri Jourdan committed
107

108
## 2016/04/10
109 110 111

* When printing a grammar (which is done by the `--only-preprocess` options),
  remove the leading bar `|`, for compatibility with `yacc` and `bison`.
POTTIER Francois's avatar
POTTIER Francois committed
112

113
## 2016/03/11
114 115 116 117 118

* In the code back-end, generate type annotations when extracting a semantic
  value out of the stack. When working with a semantic value of some function
  type, OCaml would incorrectly warn that this function does not use its
  argument. This warning should now be gone.
119

120
## 2016/03/03
121 122 123

* Makefile changes, so as to support `ocamlbuild` 4.03, which seems to have
  stricter hygiene rules than previous versions.
POTTIER Francois's avatar
POTTIER Francois committed
124

125
## 2015/12/30
126 127 128 129

* Prevented an incorrect installation that would take place if `USE_OCAMLFIND`
  was given during `make all` but not during `make install`. Added a command
  line directive `--suggest-ocamlfind`.
130

131
## 2015/11/11
132 133 134 135

* Fixed a severe bug in Menhir 20151110 which (when using the code back-end)
  could cause a generated parser to crash. Thanks to ygrek for reporting the
  bug.
POTTIER Francois's avatar
POTTIER Francois committed
136

137
* The code produced by version `XXXXXXXX` of `menhir --table` can now be linked only
138 139 140
  against a matching version of MenhirLib. If an incorrect version of MenhirLib
  is installed, the OCaml compiler should complain that
  `MenhirLib.StaticVersion.require_XXXXXXXX` is undefined.
141

142
## 2015/11/10
143 144 145

* Optimized the computation of `$symbolstartpos`, based on a couple of assumptions
  about the lexer. (See the manual.)
POTTIER Francois's avatar
POTTIER Francois committed
146

147
## 2015/11/04
148 149 150 151 152

* Modified the treatment of `%inline` so that the positions that are computed are
  the same, regardless of whether `%inline` is used. This property did not hold
  until now. It now does. Of course, this means that the positions computed by
  the new Menhir are not the same as those computed by older versions of Menhir.
POTTIER Francois's avatar
POTTIER Francois committed
153

154 155 156
* Fixed a bug in the treatment of `%inline` that would lead to an incorrect
  position being computed when the caller and callee had a variable by the
  same name.
POTTIER Francois's avatar
POTTIER Francois committed
157

158 159 160 161 162 163 164 165
* Modified Menhir so as to compute the start and end positions in the exact same
  way as `ocamlyacc`. (There used to be a difference in the treatment of epsilon
  productions.) Of course, this means that the positions computed by the new
  Menhir are not the same as those computed by older versions of Menhir. Added
  the keyword `$symbolstartpos` so as to simulate `Parsing.symbol_start_pos()`
  in the `ocamlyacc` world. The keyword `$startpos` sometimes produces a position
  that is too far off to the left; `$symbolstartpos` produces a more accurate
  position.
POTTIER Francois's avatar
POTTIER Francois committed
166

167 168 169
* Incompatible change of the incremental API: instead of a unit argument, the
  entry points (which are named after the start symbols) now require an initial
  position, which typically should be `lexbuf.lex_curr_p`.
170

171
## 2015/11/03
172 173 174

* Fix-fix-and-re-fix the `Makefile` in an attempt to allow installation under
  opam/Windows. Thanks to Daniel Weil for patient explanations and testing.
175

176
## 2015/10/29
177 178 179 180 181 182

* MenhirLib is now installed in both binary and source forms.
  `menhir --suggest-menhirLib` reports where MenhirLib is installed.
  This can be used to retrieve a snapshot of MenhirLib in source form
  and include it in your project (if you wish to use `--table` mode, yet
  do not wish to have a dependency on MenhirLib).
183

184
## 2015/10/26
185 186 187 188

* Allow `--list-errors` to work on 32-bit machines (with low hard limits).
  This should fix a problem whereby the 2015/10/23 release could not
  bootstrap on a 32-bit machine.
189

190
## 2015/10/23
191 192 193 194 195 196 197 198 199

* New declaration `%on_error_reduce foo`, where `foo` is a nonterminal symbol.
  This modifies the automaton as follows. In every state where a production of
  the form `foo -> ...` is ready to be reduced, every error action is replaced
  with a reduction of this production. (If there is a conflict between several
  productions that could be reduced in this manner, nothing is done.) This does
  not affect the language that is accepted by the automaton, but delays the
  detection of an error: more reductions take place before the error is
  detected.
POTTIER Francois's avatar
POTTIER Francois committed
200

201 202 203 204
* Fixed a bug whereby Menhir would warn about a useless `%prec` declaration,
  even though it was useful. This would happen when the declaration was
  duplicated (by inlining or by macro-expansion) and some but not all of
  the copies were useful.
205

206
* Added `has_default_reduction` to the incremental API.
207

208 209 210 211
* Modified the meaning of `--canonical` to allow default reductions to take
  place. This implies no loss of precision in terms of lookahead sets,
  and should allow gaining more contextual information when a syntax
  error is encountered. (It should also lead to a smaller automaton.)
212

213 214 215 216 217 218 219 220 221 222 223 224 225 226
* A brand new set of tools to work on syntax errors.
* New command `--list-errors`, which produces a list of input sentences which
  are representative of all possible syntax errors. (Costly.)
* New command `--interpret-error`, which confirms that one particular input
  sentence ends in a syntax error, and prints the number of the state in
  which this error occurs.
* New command `--compile-errors`, which compiles a list of erroneous sentences
  (together with error messages) to OCaml code.
* New command `--compare-errors`, which compares two lists of erroneous sentences
  to check if they cover the same error states.
* New command `--update-errors`, which updates the auto-generated comments in
  a list of erroneous sentences.
* New command `--echo-errors`, which removes all comments and messages from
  a list of erroneous sentences, and echoes just the sentences.
POTTIER Francois's avatar
POTTIER Francois committed
227

228
## 2015/10/16
229 230

* Additions to the incremental API.
231 232 233 234 235 236 237
  * A `supplier` is a function that produces tokens on demand.
  * `lexer_lexbuf_to_supplier` turns a lexer and a lexbuf into a supplier.
  * `loop` is a ready-made made main parsing loop.
  * `loop_handle` is a variant that lets the user do her own error handling.
  * `loop_handle_undo` is a variant that additionally allows undoing the last
    few "spurious" reductions.
  * `number` maps a state of the LR(1) automaton to its number.
238 239 240 241

* Incompatible change of the incremental API: renamed the type `'a result`
  to `'a checkpoint`. This is a better name anyway, and should help avoid
  confusion with the type `'a result` introduced in OCaml 4.03.
242

243
## 2015/10/12
244 245

* Avoid using `$(shell pwd)` in `Makefile`, for better Windows compatibility.
246

247
## 2015/10/05
248 249 250

* Fixed a bug where inconsistent OCaml code was generated when `--table`
  and `--external-tokens` were used together. (Reported by Darin Morrison.)
251

252 253
* In `--infer` mode, leave the `.ml` file around (instead of removing it) if
  `ocamlc` fails, so we have a chance to understand what's wrong.
254

255
## 2015/09/21
256 257 258

* Re-established some error messages concerning the mis-use of `$i` which
  had disappeared on 2015/06/29.
POTTIER Francois's avatar
POTTIER Francois committed
259

260
## 2015/09/11
261 262 263 264 265

* Fixed the mysterious message that would appear when a nonterminal symbol
  begins with an uppercase letter and `--infer` is turned on. Clarified the
  documentation to indicate that a (non-start) nonterminal symbol can begin
  with an uppercase letter, but this is not recommended.
266

267
## 2015/08/27
268 269 270 271 272 273

* New option `--inspection` (added last January, documented only now). This
  generates an inspection API which allows inspecting the automaton's stack,
  among other things. This API can in principle be used to write custom code
  for error reporting, error recovery, etc. It is not yet mature and may
  change in the future.
274

275
## 2015/07/20
276 277

* Added the command line options `--unused-token <symbol>` and `--unused-tokens`.
278

279
## 2015/06/29
280 281 282 283 284

* Changed the treatment of the positional keywords `$i`. They are now
  rewritten into variables of the form `_i` where `i` is an integer.
  Users are advised not to use variables of this form inside semantic
  actions.
Yann Régis-Gianas's avatar
Yann Régis-Gianas committed
285

286
## 2015/02/11
287 288 289 290 291

* Added support for anonymous rules. This allows writing, e.g.,
  `list(e = expression SEMI { e })`
  whereas previously one should have written
  `list(terminated(e, SEMI))`.
292

293
## 2015/02/09
294 295

* Moved all of the demos to `ocamlbuild` (instead of `make`).
296

297
## 2015/01/18
298 299 300

* Incompatible change of the incremental API.
  The incremental API now exposes shift events too.
301

302
## 2015/01/16
303 304 305 306

* Fixed a couple bugs in `Makefile` and `src/Makefile` which would cause
  compilation and installation to fail with `TARGET=byte`. (Reported
  by Jérémie Courrèges-Anglas and Daniel Dickman.)
307

308
## 2015/01/01
309 310 311

* Incompatible change of the incremental API.
  The entry point `main_incremental` is now named `Incremental.main`.
312

313
## 2014/12/29
314 315

* Incompatible change of the incremental API.
316 317 318 319 320
  * The API now exposes reduction events.
  * The type `'a result` is now private.
  * The type `env` is no longer parameterized.
  * `handle` is renamed to `resume`.
  * `offer` and `resume` now expect a result, not an environment.
321

322
## 2014/12/22
323 324

* Documented the Coq back-end (designed and implemented by Jacques-Henri Jourdan).
325

326
## 2014/12/15
327 328

* New incremental API (in `--table` mode only), inspired by Frédéric Bour.
POTTIER Francois's avatar
POTTIER Francois committed
329

330
## 2014/12/11
331

332 333 334 335 336 337 338
* Menhir now reports an error if one of the start symbols produces
  either the empty language or the singleton language {epsilon}.

* Although some people out there actually define a start symbol that recognizes
  {epsilon} (and use it as a way of initializing or re-initializing some global
  state), this is considered bad style. Furthermore, by ruling out this case, we
  are able to simplify the table back-end a little bit.
339

340
## 2014/12/12
341 342

* A speed improvement in the code back-end.
POTTIER Francois's avatar
POTTIER Francois committed
343

344
## 2014/12/08
345 346

* Menhir now requires OCaml 4.02 (instead of 3.09).
347

348
## 2014/12/02
349 350 351

* Removed support for the `$previouserror` keyword.
* Removed support for `--error-recovery` mode.
352

353
## 2014/02/18
354

355 356 357 358
* In the Coq backend, use `'` instead of `_` as separator in identifiers.
  Also, correct a serious bug that was inadvertently introduced on
  2013/03/01 (r319).

359
## 2014/02/14
360 361 362

* Lexer fix so as to support an open variant type `[> ...]` within
  a `%type<...>` declaration.
363

364
## 2013/12/16
365 366 367 368 369

* Updated the `Makefile` so that `install` no longer depends on `all`.

* Updated the demos so that the lexer does not invoke `exit 0`
  when encoutering `eof`. (This should be more intuitive.)
fpottier's avatar
fpottier committed
370

371
## 2013/09/11
372 373 374

* Fixed a newline conversion problem that would prevent Menhir from
  building on Windows when using ocaml 4.01.
375

376
## 2013/03/02
377 378 379

* Switched to ocamlbuild. Many thanks to Daniel Weil for offering
  very useful guidance.
fpottier's avatar
fpottier committed
380

381
## 2013/01/16
382 383 384

* `menhir --depend` was broken since someone added new whitespace in the output
  of `ocamldep`. Fixed.
385

386
## 2012/12/19
387 388 389 390

* Fixed a compilation problem that would arise when a file produced
  by Menhir on a 64-bit platform was compiled by ocaml on a 32-bit
  platform.
391

392
## 2012/08/25
393 394 395 396

* Performance improvements in the computation of various information
  about the automaton (module `Invariant`). The improvements will be
  noticeable only for very large automata.
397

398
## 2012/06/07
399 400 401

* The option `--log-grammar 3` (and above) now causes the `FOLLOW` sets for
  terminal symbols to be computed and displayed.
402

403
## 2012/05/25
404 405 406 407 408

* Added the flag `--canonical`, which causes Menhir to produce a canonical LR(1)
  automaton in the style of Knuth. This means that no merging of states takes
  place during the construction of the automaton, and that no default reductions
  are allowed.
409

410
## 2012/01/23
411 412 413 414 415 416

* Fixed a bug whereby a `%nonassoc` declaration was not respected. This
  declaration requests that a shift/reduce conflict be reduced in favor of
  neither shifting nor reducing, that is, a syntax error must occur. However,
  due to an unforeseen interaction with the default reduction mechanism, this
  declaration was sometimes ignored and reduction would take place.
417

418
## 2012/01/09
419 420 421

* Changes in the (undocumented) Coq back-end so as to match the ESOP 2012
  paper.
422

423
## 2011/10/19
424 425 426

* The `Makefile` now tests whether Unix or Windows is used (the test is performed
  by evaluating `Sys.os_type` under `ocaml`) and changes a couple settings accordingly:
427 428
  * the executable file name is either `menhir` or `menhir.exe`
  * the object file suffix is either `.o` or `.obj`
429 430 431

* Added `--strict`, which causes many warnings about the grammar and about the
  automaton to be considered errors.
432

433 434 435 436 437 438
* The `#` annotations that are inserted in the generated `.ml` file now retain their
  full path. (That is, we no longer use `Filename.basename`.) This implies that
  the `#` annotations depend on how Menhir is invoked
  -- e.g., `menhir foo/bar.mly` and `cd foo && menhir bar.mly` will produce different
  results. Nevertheless, this seems reasonable and useful (e.g., in conjunction
  with `ocamlbuild` and a hierarchy of files). Thanks to Daniel Weil.
439

440
## 2011/10/06
441 442

* With the `-lg 1` switch, Menhir now indicates whether the grammar is SLR(1).
443

444
## 2011/05/24
445 446 447 448

* Removed the lock in `ocamldep.wrapper`. It is the responsibility of the user
  to avoid interferences with other processes (or other instances of the script)
  that create and/or remove files.
449

450
## 2011/04/28
451 452 453 454 455

* The (internal) computation of the automaton's invariant was broken and has
  been fixed. Surprisingly, this does not seem to affect the generated code,
  (which was correct,) so no observable bug is fixed. Hopefully no bug is
  introduced!
456

457
## 2011/04/07
458 459 460 461

* The grammar description files (`.mly`) are now read in up front and stored in
  memory while they are parsed. This allows us to avoid the use of `pos_in` and
  `seek_in`, which do not work correctly when CRLF conversion is being performed.
462

463
## 2011/04/05
464 465 466

* Fixed a bug in the type inference module (for parameterized non-terminals)
  which would cause an infinite loop.
467

468
## 2011/01/24
469 470 471 472 473

* Fixed a bug that would cause an assertion failure in the generated parser
  in some situations where the input stream was incorrect and the grammar
  involved the error token. The fix might cause grammars that use the error
  token to behave differently (hopefully more accurately) as of now.
474

475
## 2009/06/18
476 477 478

* `Makefile` changes: build and install only the bytecode version of MenhirLib
  when `TARGET=byte` is set.
479

480
## 2009/02/06
481 482 483

* Fixed `ocamldep.wrapper` to avoid quoting the name of the `ocaml` command.
  This is hoped to fix a compilation problem under MinGW.
484

485
## 2009/02/04
486 487 488

* A `Makefile` fix to avoid a problem under Windows/Cygwin.
* Renamed the `ocaml-check-version` script so as to avoid a warning.
489

490
## 2008/09/05
491 492

* Ocaml summer project: added `--interpret`, `--table`, and `--suggest-*`.
493

494
## 2008/08/06
495 496 497

* Fixed a problem that would cause the code inliner to abort when a semantic
  value and a non-terminal symbol happened to have the same name.
498

499
* Removed code sharing.
500

501
## 2008/06/20
502 503

* Removed an incorrect assertion that caused failures (`lr1.ml`, line 134).
504

505
## 2007/12/05
506 507 508

* Disabled code sharing by default, as it is currently broken. (See Yann's
  message; assertion failure at runtime.)
509

510
## 2007/12/01
511 512 513

* Added an optimization to share code among states that have identical
  outgoing transition tables.
514

515
## 2007/08/30
516 517 518

* Small `Makefile` change: create an executable file for `check-ocaml-version` in
  order to work around the absence of dynamic loading on some platforms.
519

520
## 2007/05/20
521 522 523 524

* Made a fundamental change in the construction of the LR(1) automaton
  in order to eliminate a bug that could lead to spurious conflicts --
  thanks to Ketti for submitting a bug report.
525

526
## 2007/05/18
527 528 529

* Added `--follow-construction` to help understand the construction of the
  LR(1) automaton (very verbose).
530

531
## 2007/05/11
532 533 534 535 536

* Code generation: more explicit qualifications with `Pervasives` so as
  to avoid capture when the user redefines some of the built-in operators,
  such as `(+)`.
* Added a new demo (`calc-param`) that shows how to use `%parameter`.
537

538
## 2007/03/22
539 540 541

* `Makefile` improvements (check for `PREFIX`; bootstrap in bytecode now
  also available). Slight changes to `OMakefile.shared`.
542

543
## 2007/02/15
544 545

* Portability fix in `Makefile` and `Makefile.shared` (avoided `which`).
546

547
## 2006/12/15
548 549

* Portability fix in `Makefile.shared` (replaced `&>` with `2>&1 >`).
550

551
## 2006/06/23
552 553 554 555

* Made a slight restriction to Pager's criterion so as to never introduce
  fake conflict tokens (see `Lr0.compatible`). This might help make conflict
  explanations more accurate in the future.
556

557
## 2006/06/16
558 559

* Fixed bug that would cause positions to become invalid after inlining.
560

561
## 2006/06/15
562 563 564 565

* Fixed `--depend` to be more lenient when analyzing `ocamldep`'s output.
* Added `--raw-depend` which transmits `ocamldep`'s output unchanged (for
  use in conjunction with `omake`).
566

567
## 2006/06/12
568 569 570 571 572 573 574 575 576 577

* Fixed bug that would cause `--only-preprocess` to print `%token` declarations
  also for pseudo-tokens.
* Fixed bug that caused some precedence declarations to be incorrectly
  reported as useless.
* Improved things so that useless pseudo-tokens now also cause warnings.
* Fixed bug that would cause `%type` directives for terminal symbols to
  be incorrectly accepted.
* Fixed bug that would occur when a semantic action containing `$i` keywords
  was inlined.
578

579
## 2006/05/05
580 581 582

* Fixed problem that caused some end-of-stream conflicts not to be reported.
* Fixed Pager's compatibility criterion to avoid creating end-of-stream conflicts.
583

584
## 2006/04/21
585 586 587 588

* Fixed problem that allowed generating incorrect but apparently well-typed
  Objective Caml code when a semantic action was ill-typed and `--infer` was
  omitted.
589

590
## 2006/03/29
591 592

* Improved conflict reports by factoring out maximal common derivation contexts.
593

594
## 2006/03/28
595 596

* Fixed bug that could arise when explaining a conflict in a non-LALR(1) grammar.
597

598
## 2006/03/27
599

600 601
* Changed count of reduce/reduce conflicts to allow a comparison
  with `ocamlyacc`'s diagnostics.
602
* When refusing to resolve a conflict, report all diagnostics before dying.
603

604
## 2006/03/18
605 606 607 608

* Added display of `FOLLOW` sets when using `--log-grammar 2`.
* Added `--graph` option.
* Fixed behavior of `--depend` option.
609

610
## 2006/01/06
611 612

* Removed reversed lists from the standard library.