R=rsc
DELTA=23  (23 added, 0 deleted, 0 changed)
OCL=32592
CL=32595

add commentary about findVar's invariant.

R=rsc
DELTA=6  (3 added, 0 deleted, 3 changed)
OCL=32583
CL=32594

R=rsc
DELTA=1  (0 added, 0 deleted, 1 changed)
OCL=32591
CL=32593

R=rsc
DELTA=73  (27 added, 25 deleted, 21 changed)
OCL=32587
CL=32587

R=ken
OCL=32581
CL=32581

R=ken
OCL=32576
CL=32580

- make token.Position.String more robust

TBR=rsc
DELTA=20  (10 added, 6 deleted, 4 changed)
OCL=32564
CL=32564

R=rsc
OCL=32563
CL=32563

handled by typecheck.

second switch is gone

move floating point minus into back end

R=ken
OCL=32558
CL=32558

R=rsc
DELTA=28  (19 added, 0 deleted, 9 changed)
OCL=32550
CL=32554

- more orthogonal functionality of filter functions for better re-use

go/doc/doc.go:
- simplified interface
- collect filenames of packages so that they can be shown

godoc:
- removed TODO, show list of package (linked) files used to create documentation

R=rsc
DELTA=130  (68 added, 24 deleted, 38 changed)
OCL=32549
CL=32552

R=gri
APPROVED=gri
DELTA=33  (20 added, 6 deleted, 7 changed)
OCL=32544
CL=32546

R=rsc
DELTA=2  (0 added, 0 deleted, 2 changed)
OCL=32540
CL=32545

started to move typechecking to another file.
can build entire tree still, but lots of work
is duplicated.  much to clean up.

R=ken
OCL=32536
CL=32543

let errchk exit 0 even if it has reported a BUG.
it echoed BUG and that's all that matters.

R=r
DELTA=143  (1 added, 89 deleted, 53 changed)
OCL=32533
CL=32542

Return checking is now done as a general flow check at the end
of function compilation, since break and goto complicated the
way I was doing return checking before.  Goto-over-declaration
checking is also done as a final flow check.

Temporary variables used for effect extraction are now
actually temporary.  Otherwise "op=", "++", and "--" appear as
declarations that cannot be jumped over.

R=rsc
APPROVED=rsc
DELTA=421  (344 added, 38 deleted, 39 changed)
OCL=32527
CL=32535

so that gdb shows full path in stack traces.

R=r
DELTA=4  (4 added, 0 deleted, 0 changed)
OCL=32522
CL=32528

R=ken
OCL=32521
CL=32521

roll back 32496

TBR=austin
OCL=32499
CL=32501

TBR=austin
OCL=32496
CL=32496

R=rsc
DELTA=154  (71 added, 6 deleted, 77 changed)
OCL=32483
CL=32492

- Changed filter function for parser.ParsePackage to
  take an *os.Dir instead of a filename for more
  powerful filters

- Removed TODO in ast.PackageInterface: Now collect
  package comments from all package files

- Cleanups in godoc: Use the new ParsePackage and
  PackageInterface functions; as a result computing
  package information is much simpler now.

R=rsc
DELTA=285  (80 added, 110 deleted, 95 changed)
OCL=32473
CL=32486

R=r
DELTA=16  (15 added, 0 deleted, 1 changed)
OCL=32475
CL=32481

R=austin
DELTA=35  (21 added, 14 deleted, 0 changed)
OCL=32469
CL=32474

R=rsc
OCL=32472
CL=32472

5 known bugs; 0 unexpected bugs; test output differs

R=r
DELTA=3  (2 added, 0 deleted, 1 changed)
OCL=32468
CL=32470

R=rsc
DELTA=5  (0 added, 1 deleted, 4 changed)
OCL=32465
CL=32467

4 known bugs; 0 unexpected bugs

which should be less scary to people
unfamiliar with the tests.

R=r
DELTA=44  (29 added, 12 deleted, 3 changed)
OCL=32460
CL=32464

R=rsc
DELTA=32  (24 added, 1 deleted, 7 changed)
OCL=32461
CL=32463

labeled break/continue was using
first loop with any label,
not first loop with the right label.

R=ken
OCL=32453
CL=32458

R=rsc
DELTA=121  (115 added, 0 deleted, 6 changed)
OCL=32427
CL=32429

not complete but compiler still works.

R=ken
OCL=32424
CL=32426

R=ken
OCL=32421
CL=32421

single frame and non-overlapping variables reuse frame slots.
As a result, entering and exiting blocks no longer requires
code execution, which means jumps across block boundaries
should be doable now.  Frame slot initialization happens at
definition time now, instead of at frame creation time.  As an
added bonus, Scope's are now exclusively compile-time objects
and we no longer need to specially track the function
activation frame for access to out vars.

R=rsc
APPROVED=rsc
DELTA=313  (102 added, 90 deleted, 121 changed)
OCL=32416
CL=32420

R=ken
OCL=32419
CL=32419

R=r
DELTA=9  (8 added, 0 deleted, 1 changed)
OCL=32413
CL=32418

so that == on func means that the
functions originated in the same
execution of a func literal or definition.

before, there was an inconsistency:

	func() {x++} != func() {x++}

but

	func() {} == func() {}

this CL makes the second case != too,
just like

	make(map[int]int) != make(map[int]int)

R=r
DELTA=202  (71 added, 62 deleted, 69 changed)
OCL=32393
CL=32398

This makes the list closed under its provided operations.

R=rsc,gri
APPROVED=rsc
DELTA=18  (14 added, 0 deleted, 4 changed)
OCL=32388
CL=32395

R=rsc
DELTA=3  (3 added, 0 deleted, 0 changed)
OCL=32389
CL=32392

easier and faster to read.  they are now either a one-byte value or a n-byte value
preceded by a byte holding -n.

R=rsc
DELTA=150  (45 added, 7 deleted, 98 changed)
OCL=32381
CL=32387