will make reading type info easier.

R=r
DELTA=21  (2 added, 1 deleted, 18 changed)
OCL=17491
CL=17501

R=r
DELTA=3  (3 added, 0 deleted, 0 changed)
OCL=17497
CL=17500

R=gri
DELTA=1  (0 added, 0 deleted, 1 changed)
OCL=17476
CL=17499

- converted 2 right-recursive parsing functions into iterative versions
- renamed node.go -> ast.go (clearer)

R=r
OCL=17496
CL=17498

	make sure methods end up immediately following
	the struct they are methods on.
ar:
	eliminate duplicate definitions from __.PKGDEF.
	check that multiple .6 do not give different defs for same
		exported type/var/func/const.
	increase ar header name size from 16 to 64 bytes

R=r
DELTA=379  (333 added, 18 deleted, 28 changed)
OCL=17477
CL=17481

R=rsc
DELTA=72  (69 added, 0 deleted, 3 changed)
OCL=17478
CL=17480

R=r
OCL=17463
CL=17463

R=r
DELTA=15  (6 added, 7 deleted, 2 changed)
OCL=17447
CL=17461

- added a note with respect the difference of semantics of *p++ in Go vs C

R=r
DELTA=14  (6 added, 2 deleted, 6 changed)
OCL=17455
CL=17457

- as a result deleted some more code

R=r
OCL=17449
CL=17449

R=r
OCL=17437
CL=17437

  treating ":" as lowest-level binary operator
- more precise error message for composites
- added flag -columns (false) - when set, prints precise error column
- a few more tests

R=r
OCL=17428
CL=17428

- in selftest mode (-t) interpret comments of the form /* ERROR */ and /* SYNC */
  and validate reported errors with the error markings in a file
- added initial selftest.go file

Also:
- fixed an issue with empty blocks
- generally report better error messages
- added many more tests to the test script (essentially all .go programs which
  have no syntax errors)

R=r
OCL=17426
CL=17426

R=rsc
DELTA=421  (357 added, 17 deleted, 47 changed)
OCL=17388
CL=17401

R=rsc
OCL=17398
CL=17398

the comment talked about printing, but now
t->recur is only used for typehash.
in typehash it is important to compute different
hashes for the different basic types.

add test that makes sure an interface { X() int8 }
cannot be used as interface { X() int64 }

R=ken
OCL=17396
CL=17396

R=ken
OCL=17394
CL=17394

R=rsc
DELTA=14  (10 added, 0 deleted, 4 changed)
OCL=17387
CL=17390

R=r
DELTA=1  (0 added, 0 deleted, 1 changed)
OCL=17380
CL=17380

- more robust printing in presence of errors
- fixed incorrect printing of function literals

R=r
OCL=17378
CL=17378

R=ken
OCL=17377
CL=17377

R=rsc
DELTA=1  (0 added, 0 deleted, 1 changed)
OCL=17375
CL=17375

R=rsc
DELTA=328  (158 added, 170 deleted, 0 changed)
OCL=17353
CL=17359

R=rsc
DELTA=25  (19 added, 1 deleted, 5 changed)
OCL=17346
CL=17346

so that run's count is correct

R=iant,r
DELTA=20  (12 added, 0 deleted, 8 changed)
OCL=17329
CL=17342

- fixed a bug with non-eof terminated //-style comments
- collecting comments
- first experiments with reproducing comments
  (works but not very pretty, disabled for now)
- idempotent for all correct .go files we have checked in

R=r
OCL=17333
CL=17333

- fixed a couple of printing bugs
status: parses, reproduces, and idempotently reproduces all correct .go files

R=r
OCL=17332
CL=17332

R=rsc
DELTA=253  (153 added, 81 deleted, 19 changed)
OCL=17331
CL=17331

R=r
OCL=17327
CL=17327

R=rsc
DELTA=366  (337 added, 7 deleted, 22 changed)
OCL=17321
CL=17324

R=ken
OCL=17320
CL=17320

R=r
OCL=17319
CL=17319

R=r
DELTA=21  (11 added, 1 deleted, 9 changed)
OCL=17316
CL=17316

- typeguards, var decls, several printing bug fixed
- now fully idempotent on many files (which are accepted by 6g afterwards)
- still some detail issues

R=r
OCL=17310
CL=17310

R=ken
OCL=17307
CL=17307

inputs for method receivers.

R=r
OCL=17304
CL=17304

R=r
OCL=17295
CL=17295

R=rsc
DELTA=225  (109 added, 107 deleted, 9 changed)
OCL=17294
CL=17294

file name change in next round.

R=rsc
DELTA=71  (18 added, 19 deleted, 34 changed)
OCL=17291
CL=17293

- fallthrough stat, label decls
- improved printing layout

R=r
OCL=17283
CL=17283