whether no register argument was
REGARG == 0 or REGARG < 0.
use REGARG < 0 because arm needs 0 for R0.

R=ken
OCL=31562
CL=31566

R=rsc
APPROVED=rsc
DELTA=7  (7 added, 0 deleted, 0 changed)
OCL=31563
CL=31565

runtime package for use by debugger,
which needs to make sure that all ptrace calls
about a given pid come from the same thread.

R=r
DELTA=175  (90 added, 63 deleted, 22 changed)
OCL=31546
CL=31558

client library.
muxes on both ends.

R=rsc
DELTA=178  (132 added, 26 deleted, 20 changed)
OCL=31541
CL=31556

before:
	mainstart: undefined: main·init in mainstart
	mainstart: branch out of range in mainstart
	(95)    CALL    ,0(PC) [main·init]
	mainstart: undefined: main·main in mainstart
	mainstart: branch out of range in mainstart
	(97)    CALL    ,0(PC) [main·main]
	mainstart: doasm: notfound from=6f to=6f (95)    CALL    ,
	mainstart: doasm: notfound from=6f to=6f (97)    CALL    ,
	mainstart: doasm: notfound from=6f to=6f (95)    CALL    ,
	mainstart: doasm: notfound from=6f to=6f (97)    CALL    ,
	mainstart: doasm: notfound from=6f to=6f (95)    CALL    ,
	mainstart: doasm: notfound from=6f to=6f (97)    CALL    ,

after:
	mainstart: undefined: main·init in mainstart
	mainstart: undefined: main·main in mainstart

R=r
DELTA=7  (1 added, 0 deleted, 6 changed)
OCL=31555
CL=31555

R=r
DELTA=13  (13 added, 0 deleted, 0 changed)
OCL=31535
CL=31549

R=r
DELTA=8  (6 added, 0 deleted, 2 changed)
OCL=31537
CL=31537

server side only; no client help yet (but it's easy).
no http yet.
service is synchronous.
all this will improve.

R=rsc
DELTA=403  (403 added, 0 deleted, 0 changed)
OCL=31522
CL=31536

R=rsc
DELTA=10  (5 added, 1 deleted, 4 changed)
OCL=31523
CL=31526

- basic verification of EBNF grammars
- tested with (and has testcase for) go_spec.html

R=rsc
DELTA=150  (148 added, 0 deleted, 2 changed)
OCL=31481
CL=31517

- parsing of EBNF grammars
- basic consistency checks

R=rsc
DELTA=695  (695 added, 0 deleted, 0 changed)
OCL=31479
CL=31516

instead of SP.

R=rsc
APPROVED=rsc
DELTA=13  (3 added, 7 deleted, 3 changed)
OCL=31488
CL=31501

R=rsc
APPROVED=rsc
DELTA=1  (0 added, 0 deleted, 1 changed)
OCL=31487
CL=31500

R=rsc
DELTA=184  (181 added, 1 deleted, 2 changed)
OCL=31474
CL=31486

R=rsc
DELTA=2  (0 added, 1 deleted, 1 changed)
OCL=31472
CL=31477

rename map access methods to Elem, SetElem.

R=r
DELTA=95  (66 added, 7 deleted, 22 changed)
OCL=31456
CL=31469

walkstate -> walkstmt
walktype -> walkexpr; stmts moved to walkstmt

walktype and friends have a final Node **init
argument that can have side effects appended,
making it more explicit when they do and do not happen.
this replaces the old global addtop and addtotop.

delete switch map and interface conversion cases
(dropped from the language months ago).

R=ken
OCL=31465
CL=31468

R=rsc
OCL=31467
CL=31467

- make real productions for Unicode char classes so that they can be parsed
- use `` for tokens that contain "'s or \'s so that they can be parsed
- added a missing '.'

This version of the spec passes through ebnflint (forthcoming) without errors.

R=r,rsc
DELTA=74  (3 added, 1 deleted, 70 changed)
OCL=31464
CL=31466

R=rsc
DELTA=25  (25 added, 0 deleted, 0 changed)
OCL=31460
CL=31460

R=rsc
DELTA=84  (65 added, 9 deleted, 10 changed)
OCL=31458
CL=31458

R=rsc
DELTA=47  (30 added, 16 deleted, 1 changed)
OCL=31455
CL=31455

R=r
DELTA=1  (0 added, 0 deleted, 1 changed)
OCL=31450
CL=31452

R=rsc
DELTA=2  (0 added, 0 deleted, 2 changed)
OCL=31449
CL=31451

R=rsc
APPROVED=rsc
DELTA=422  (211 added, 211 deleted, 0 changed)
OCL=31425
CL=31431

R=rsc
DELTA=57  (39 added, 3 deleted, 15 changed)
OCL=31424
CL=31430

R=r
DELTA=156  (135 added, 8 deleted, 13 changed)
OCL=31407
CL=31428

This is meant to be implemented per platform and used by
higher-level debugging libraries.

R=rsc
APPROVED=rsc
DELTA=211  (211 added, 0 deleted, 0 changed)
OCL=31003
CL=31423

R=rsc
OCL=31421
CL=31421

R=r
DELTA=2  (0 added, 2 deleted, 0 changed)
OCL=31417
CL=31420

R=gri
DELTA=6  (0 added, 1 deleted, 5 changed)
OCL=31415
CL=31419

ast.go:
- rename Comments -> CommentGroup (less confusion)
- change all comments/docs to be *CommentGroup

filter.go:
- do not remove unassociated comments from program as part
  of export filtering (they are needed by doc.go for BUG comments)

scanner.go:
- exclude '\n' from //-style comments

parser.go:
- rewrote collection of comments: now all collected comments
  are *ast.CommentGroups
- clarified distinction between leading and trailing comments
- fixed a bug in comment collection (parseGenDecl);
  corresponding test case is in printer/testdata
- extra documentation

doc.go:
- collect BUG comments
- corresponding fix for parser bug in comment collection

comment.go:
- simplified regex

printer.go:
- adjust comment printing to new representation

printer_test.go, testdata/*:
- enable printing of doc comments
- extended tests

package.html, package.txt:
- added Bugs section

gofmt:
- enable printing of doc comments

R=rsc
DELTA=339  (126 added, 38 deleted, 175 changed)
OCL=31403
CL=31416

change Type to gobType.
fix some bugs around recursive structures.
lots of cleanup.
add the first cut at a type encoder.

R=rsc
DELTA=400  (287 added, 11 deleted, 102 changed)
OCL=31401
CL=31406

R=ken
OCL=31399
CL=31399

R=rsc
OCL=31396
CL=31396

  - rename untar{,_test}.go to reader{,_test}.go.
  - fix up some comments.
  - improve test output if it fails.

R=rsc
APPROVED=rsc
DELTA=821  (400 added, 392 deleted, 29 changed)
OCL=31376
CL=31378

add channel send type check (thanks austin).
fix type mismatch message.

R=r
DELTA=241  (225 added, 5 deleted, 11 changed)
OCL=31370
CL=31375

R=rsc
OCL=31373
CL=31373

R=rsc
APPROVED=rsc
DELTA=456  (382 added, 66 deleted, 8 changed)
OCL=31246
CL=31372

so remove code from go.y.

show original types in badtype; don't remove pointers.
not sure why this was here but it confuses things
if the bad part involves two named pointer types
with different names but the same pointed-at type.

R=ken
OCL=31369
CL=31369