- delete vestigial SetString method
- make type map use interface instead of *interface

R=rsc
DELTA=31  (0 added, 7 deleted, 24 changed)
OCL=20861
CL=20863

R=r
DELTA=746  (729 added, 1 deleted, 16 changed)
OCL=20858
CL=20858

R=rsc
DELTA=326  (4 added, 259 deleted, 63 changed)
OCL=20853
CL=20856

- fix pretty printer to work with new tabwriter interface

R=r
OCL=20854
CL=20854

  per rune cannot be computed correctly if we have only parts
  of a rune - delay computation
- added html filtering mode: html tags and entities are ignored
  for width computations
- expanded tests:
  - extra tests for html text
  - extra tests that write text in various portions

R=r
DELTA=227  (126 added, 20 deleted, 81 changed)
OCL=20833
CL=20835

R=r
OCL=20834
CL=20834

R=r
DELTA=178  (18 added, 101 deleted, 59 changed)
OCL=20822
CL=20826

R=r
DELTA=4  (0 added, 0 deleted, 4 changed)
OCL=20788
CL=20818

any pointer or uintptr
and unsafe.pointer

R=r
OCL=20795
CL=20795

R=r
OCL=20794
CL=20794

R=r
DELTA=46  (21 added, 10 deleted, 15 changed)
OCL=20785
CL=20787

R=r
DELTA=6  (5 added, 0 deleted, 1 changed)
OCL=20777
CL=20779

but not JMP main (label).

R=ken
OCL=20724
CL=20724

bug126.go:7:7: error: redefinition of 'none'
bug126.go:6:7: note: previous definition of 'none' was here

R=gri
DELTA=3  (1 added, 0 deleted, 2 changed)
OCL=20563
CL=20723

a range m (implies :=)
a,b range m (implies :=)
a:b range m (implies :=)

a := range m
a,b := range m
a:b := range m

a = range m
a,b = range m
a:b = range m

R=r
OCL=20676
CL=20676

R=r
OCL=20667
CL=20667

R=rsc
DELTA=13  (13 added, 0 deleted, 0 changed)
OCL=20638
CL=20641

mark and sweep, stop the world garbage collector
(intermediate step in the way to ref counting).
can run pretty with an explicit gc after each file.

R=r
DELTA=502  (346 added, 143 deleted, 13 changed)
OCL=20630
CL=20635

R=rsc
DELTA=12  (3 added, 1 deleted, 8 changed)
OCL=20631
CL=20634

broken if you give it something which matches everything--the
.* swallows all the error messages.  Recognize some reasonable
error text directly.

R=rsc
DELTA=2  (0 added, 0 deleted, 2 changed)
OCL=20564
CL=20595

R=r
DELTA=84  (27 added, 3 deleted, 54 changed)
OCL=20539
CL=20584

can run peano 10 in 100 MB (instead of 1+ GB) of memory
when linking against this.
can run peano 11 in 1 GB of memory now.

R=r
DELTA=100  (44 added, 44 deleted, 12 changed)
OCL=20504
CL=20553

R=r
DELTA=94  (52 added, 33 deleted, 9 changed)
OCL=20547
CL=20552

R=rsc
DELTA=43  (19 added, 24 deleted, 0 changed)
OCL=20551
CL=20551

- first cut at html writer (will do html escaping, html tag production)
- first cut at generating basic html output via pretty
- some cleanups

R=r
OCL=20550
CL=20550

Ken's suggestion for the "iota" extension to tuples.

DELTA=171  (88 added, 57 deleted, 26 changed)
OCL=20460
CL=20544

R=r
OCL=20520
CL=20522

R=r
OCL=20506
CL=20506

(happens legitimately in c and assembly objects).

R=r
DELTA=1  (0 added, 0 deleted, 1 changed)
OCL=20497
CL=20499

unless given -d flag.

the resulting binary doesn't *use* any dynamic libraries,
it just has a reference to the dynamic linker and an
empty list of needed symbols and libraries.

this is enough to make 6.out binaries that can be run
under dtrace / dtruss.

R=r
DELTA=39  (34 added, 0 deleted, 5 changed)
OCL=20476
CL=20482

R=r,rsc
DELTA=8  (8 added, 0 deleted, 0 changed)
OCL=20468
CL=20473

R=r
DELTA=349  (348 added, 0 deleted, 1 changed)
OCL=20380
CL=20472

TBR=r
OCL=20448
CL=20448

run oldstack on g0's stack, just like newstack does,
so that oldstack can free the old stack.

R=r
DELTA=53  (44 added, 0 deleted, 9 changed)
OCL=20404
CL=20433

R=r
DELTA=130  (115 added, 1 deleted, 14 changed)
OCL=20376
CL=20385

- rewrote declaration printing - was unreadable before
- no semicolons after closing "}" for types

R=r
OCL=20379
CL=20379

* syscall:
	add syscall.RawSyscall, which doesn't use sys.entersyscall/sys.exitsyscall
	add syscall.dup2
	add syscall.BytePtrPtr
	add syscall.Rusage, RusagePtr
	add syscall.F_GETFD, F_SETFD, FD_CLOEXEC

* runtime:
	clean up, correct signal handling.
	can now survive (continue running after) a signal.

R=r
DELTA=394  (286 added, 51 deleted, 57 changed)
OCL=20351
CL=20369

format is unchanged but shows all frames
(old loop stopped one frame early).

wreck=; 6.out
cannot convert type *main.S·interface2 to interface main.I·interface2: missing method Foo
throw: interface conversion
SIGSEGV: segmentation violation
Faulting address: 0x0
pc: 0x256d

throw+0x46 /home/rsc/go/src/runtime/runtime.c:68
	throw(0x863a, 0x0)
hashmap+0x188 /home/rsc/go/src/runtime/iface.c:167
	hashmap(0x8760, 0x0, 0x85b0, 0x0, 0x0, ...)
sys·ifaceT2I+0xa8 /home/rsc/go/src/runtime/iface.c:201
	sys·ifaceT2I(0x8760, 0x0, 0x85b0, 0x0, 0x0, ...)
main·main+0x4e /home/rsc/go/src/runtime/rt0_amd64_darwin.s:87
	main·main()
mainstart+0xf /home/rsc/go/src/runtime/rt0_amd64.s:70
	mainstart()
sys·goexit /home/rsc/go/src/runtime/proc.c:110
	sys·goexit()

R=r
DELTA=44  (5 added, 15 deleted, 24 changed)
OCL=20358
CL=20368

and update test.

R=iant
DELTA=11  (3 added, 1 deleted, 7 changed)
OCL=20350
CL=20362

new syntax for exact mp floating constants
     decimal_int ( "p" | "P" ) [ "+" | "-" ] decimal_int
     the value is decimal1 * 2^decimal2

R=r
OCL=20357
CL=20357