- added IsValid predicate to token.Position
- updated pretty, godoc, gobuild
- updated/expanded test cases

R=rsc
DELTA=265  (97 added, 78 deleted, 90 changed)
OCL=28961
CL=29005

R=iant
DELTA=3  (2 added, 0 deleted, 1 changed)
OCL=28994
CL=29003

add testing/iotest package.
make bufio return error on short write.

R=r
DELTA=423  (208 added, 154 deleted, 61 changed)
OCL=28997
CL=28999

fixed bug in seeding. top 11 bits were
not changed by different seeds.

R=r
OCL=28998
CL=28998

R=r
DELTA=15  (7 added, 1 deleted, 7 changed)
OCL=28996
CL=28996

R=r
DELTA=215  (186 added, 0 deleted, 29 changed)
OCL=28968
CL=28995

structs and arrays are done
slices and maps are yet to do

R=r
OCL=28977
CL=28977

os.Exit(0) at the end of main.

R=rsc
DELTA=6  (0 added, 6 deleted, 0 changed)
OCL=28967
CL=28969

structure set up - no change yet

R=r
OCL=28966
CL=28966

(mimic behavior of slices)

R=r
DELTA=12  (12 added, 0 deleted, 0 changed)
OCL=28960
CL=28962

TBR=r
DELTA=9270  (0 added, 9270 deleted, 0 changed)
OCL=28958
CL=28958

literal type is not a type name

R=rsc
DELTA=41  (2 added, 7 deleted, 32 changed)
OCL=28955
CL=28957

format.go:
- better error handling, indentation, support for defaults,
  environments for custom formatters, cleanups (more functionality, less code)

pretty.go:
- better comment printing using format.go

made test script more robust

TBR=r
DELTA=622  (175 added, 305 deleted, 142 changed)
OCL=28956
CL=28956

R=r
DELTA=2  (1 added, 0 deleted, 1 changed)
OCL=28949
CL=28951

R=rsc
DELTA=7  (0 added, 0 deleted, 7 changed)
OCL=28947
CL=28950

R=r
DELTA=42  (0 added, 26 deleted, 16 changed)
OCL=28940
CL=28942

R=rsc
DELTA=21  (19 added, 0 deleted, 2 changed)
OCL=28938
CL=28941

R=rsc
OCL=28936
CL=28936

Getuid, etc drop their errors -- they cannot error

R=r
DELTA=605  (547 added, 12 deleted, 46 changed)
OCL=28919
CL=28929

R=ken
OCL=28918
CL=28918

R=gri,rsc
DELTA=197  (194 added, 0 deleted, 3 changed)
OCL=28900
CL=28911

R=r
DELTA=61  (34 added, 0 deleted, 27 changed)
OCL=28904
CL=28906

R=gri
DELTA=4  (1 added, 0 deleted, 3 changed)
OCL=28868
CL=28899

- Faster vector.Delete, removed result value (easy to get via At(i))

R=r
DELTA=40  (6 added, 30 deleted, 4 changed)
OCL=28866
CL=28897

R=iant
DELTA=41  (35 added, 0 deleted, 6 changed)
OCL=28892
CL=28895

AES mode wrappers not implemented, so no public interface yet.

R=r
DELTA=918  (918 added, 0 deleted, 0 changed)
OCL=28848
CL=28863

R=r
DELTA=17  (10 added, 0 deleted, 7 changed)
OCL=28860
CL=28862

R=rsc
DELTA=51  (49 added, 0 deleted, 2 changed)
OCL=28859
CL=28859

R=r
APPROVED=r
DELTA=2  (0 added, 0 deleted, 2 changed)
OCL=28847
CL=28851

R=rsc
DELTA=5  (3 added, 0 deleted, 2 changed)
OCL=28845
CL=28849

R=r
DELTA=13  (1 added, 6 deleted, 6 changed)
OCL=28840
CL=28844

* make a complete sentence.
* eliminate reference to byte positions,
  which are not a concept exposed by the interface.

R=gri
DELTA=2  (0 added, 1 deleted, 1 changed)
OCL=28838
CL=28838

R=r
DELTA=22  (17 added, 0 deleted, 5 changed)
OCL=28781
CL=28815

R=ken
OCL=28814
CL=28814

gives an type mismatch error, although both values appear to
have the same type.

R=ken,rsc
DELTA=23  (23 added, 0 deleted, 0 changed)
OCL=28786
CL=28805

R=ken
OCL=28785
CL=28785

R=r
DELTA=2  (0 added, 0 deleted, 2 changed)
OCL=28756
CL=28784

R=r
DELTA=534  (353 added, 99 deleted, 82 changed)
OCL=28783
CL=28783

- changed type equality to type compatibility, updated rules
- string literals have ideal string type
- conversion w/ relaxed type compatibilty

DELTA=123  (26 added, 22 deleted, 75 changed)
OCL=28763
CL=28780

- one node for array and slice types
- one node for index and slice expressions
- simplified parser, astprinter, and ast.txt

R=r
DELTA=71  (0 added, 43 deleted, 28 changed)
OCL=28768
CL=28768