Valgrind Massif result when linking godoc:
On amd64:
                    old          new         -/+
mem_heap_B       185844612    175358047    -5.7%
mem_heap_extra_B    773404       773137    -0.0%

On 386/ARM:
                    old          new         -/+
mem_heap_B       141775701    131289941    -7.4%
mem_heap_extra_B    737011       736955    -0.0%

R=golang-dev, r, dave
CC=golang-dev
https://golang.org/cl/6655045

Also, to aid debugging cmd/dist, make make.bat support --dist-tool flag.

Fixes #3100.

R=alex.brainman
CC=golang-dev
https://golang.org/cl/6637061

Better explanation of width for floating-point values.
Explain that scanning does not handle %#q etc.

Fixes #4202.
Fixes #4206.

R=golang-dev, adg, rsc, iant
CC=golang-dev
https://golang.org/cl/6620074

Fixes #4031.

R=golang-dev, bradfitz, remyoudompheng, r, dave
CC=golang-dev
https://golang.org/cl/6632046

Fixes #4236.

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/6658051

R=golang-dev, dsymonds, r
CC=golang-dev
https://golang.org/cl/6615078

Minor performance impact running sequentially:

benchmark                      old ns/op    new ns/op    delta
BenchmarkString10Base2               389          391   +0.51%
BenchmarkString100Base2             1530         1534   +0.26%
BenchmarkString1000Base2           11789        11787   -0.02%
BenchmarkString10000Base2         111443       112030   +0.53%
BenchmarkString100000Base2       1017483      1015347   -0.21%
BenchmarkString10Base8               339          344   +1.47%
BenchmarkString100Base8              753          756   +0.40%
BenchmarkString1000Base8            4618         4641   +0.50%
BenchmarkString10000Base8          43217        43534   +0.73%
BenchmarkString100000Base8        397518       400602   +0.78%
BenchmarkString10Base10              630          630   +0.00%
BenchmarkString100Base10            1975         1960   -0.76%
BenchmarkString1000Base10          10179        10174   -0.05%
BenchmarkString10000Base10         44527        44416   -0.25%
BenchmarkString100000Base10     14404694     14425308   +0.14%
BenchmarkString10Base16              283          288   +1.77%
BenchmarkString100Base16             597          598   +0.17%
BenchmarkString1000Base16           3189         3186   -0.09%
BenchmarkString10000Base16         29403        29364   -0.13%
BenchmarkString100000Base16       265657       265587   -0.03%

Note that due to other improvements (faster assembly routines,
better code generation by compiler), these benchmarks now run
up to 37% faster than they used to at the last time measured (1/9/2012).

Minor performance impact for StringPiParallel running in parallel:

Current CL but with Lock/Unlock commented out (removed):

BenchmarkStringPiParallel	    5000	    343581 ns/op
BenchmarkStringPiParallel-2	   10000	    184511 ns/op
BenchmarkStringPiParallel-3	   10000	    129768 ns/op
BenchmarkStringPiParallel-4	   10000	    102326 ns/op

Current CL:

BenchmarkStringPiParallel	    5000	    345169 ns/op
BenchmarkStringPiParallel-2	   10000	    185827 ns/op
BenchmarkStringPiParallel-3	   10000	    131168 ns/op
BenchmarkStringPiParallel-4	   10000	    102353 ns/op

Fixes #4218.

R=dvyukov, michael.jones, dave
CC=golang-dev
https://golang.org/cl/6643053

I was an idiot and was thinking that a small base didn't matter
because the exponentiation would quickly make the number the same size
as the modulus. But, of course, the small base continues to make
multiplications unrealistically cheap throughout the computation.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/6649048

Fixes #4220.

R=dvyukov, bradfitz
CC=golang-dev
https://golang.org/cl/6638053

Update #4191.

Fixes unreported race failure at
http://build.golang.org/log/61e43a328fb220801d3d5c88cd91916cfc5dc43c

R=dvyukov, bradfitz
CC=golang-dev
https://golang.org/cl/6640057

It was suggested that it's too easy to use crypto/hmac insecurely and
I think that has some merit. This change adds a Equal function to
make it obvious that MAC values should be compared in constant time.

R=rsc, max
CC=golang-dev
https://golang.org/cl/6632044

0. windows uses all.bat instead of ./all.bash
1. correct expected all.bash output
2. mention you need to use an application specific password
if you're using 2-step verification
3. note you can edit files included in CL by 'hg change NNNN'
or 'hg file'

R=golang-dev, adg, r
CC=golang-dev
https://golang.org/cl/6615060

R=golang-dev
CC=golang-dev
https://golang.org/cl/6641058

Fixes #3948.

R=golang-dev, r, dave, dsymonds
CC=golang-dev
https://golang.org/cl/6639064

Fixes #3733
Fixes #2149
Updated Syntax
Added part3.go example program
Added part3-errorhandling.go example program
Improved wording in some places

R=golang-dev, adg, minux.ma
CC=golang-dev
https://golang.org/cl/6636048

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/6642068

Fixes #4225.

R=golang-dev
CC=golang-dev
https://golang.org/cl/6640054

R=adg
CC=golang-dev
https://golang.org/cl/6604062

R=golang-dev, skybrian
CC=golang-dev
https://golang.org/cl/6643062

The other tests either need a complex procedure
or are architecture- or OS-dependent.

Update #4139.

R=golang-dev, daniel.morsing, iant
CC=golang-dev
https://golang.org/cl/6618062

benchmark       old ns/op    new ns/op    delta
BenchmarkDup      3075682       609448  -80.18%

R=gri
CC=golang-dev
https://golang.org/cl/6613064

R=golang-dev, r, bradfitz
CC=golang-dev
https://golang.org/cl/6635061

        Fixes #4208.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/6635064

If source are not available, then the stack looks like:
stack_test.go:40: 	/tmp/gobuilder/linux-amd64-race-72b15c5d6f65/go/src/pkg/runtime/debug/bla-bla-bla/src/pkg/runtime/debug/stack_test.go:15 (0x43fb11)
stack_test.go:40: 	/tmp/gobuilder/linux-amd64-race-72b15c5d6f65/go/src/pkg/runtime/debug/bla-bla-bla/src/pkg/runtime/debug/stack_test.go:18 (0x43fb7a)
stack_test.go:40: 	/tmp/gobuilder/linux-amd64-race-72b15c5d6f65/go/src/pkg/runtime/debug/bla-bla-bla/src/pkg/runtime/debug/stack_test.go:37 (0x43fbf4)
stack_test.go:40: 	/tmp/gobuilder/linux-amd64-race-72b15c5d6f65/go/src/pkg/testing/bla-bla-bla/src/pkg/testing/testing.go:301 (0x43b5ba)
stack_test.go:40: 	/tmp/gobuilder/linux-amd64-race-72b15c5d6f65/go/src/pkg/runtime/bla-bla-bla/src/pkg/runtime/proc.c:276 (0x410670)
stack_test.go:40:
which is 6 lines.

R=golang-dev, minux.ma
CC=golang-dev
https://golang.org/cl/6637060

In recent Python versions .reason is a read-only property that simply gives you the msg value.

Fixes #4024

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/6545052

The compiler is crashing on the following code:

type TypeID int
func (t *TypeID) encodeType(x int) (tt TypeID, err error) {
        switch x {
        case 0:
                return t.encodeType(x * x)
        }
        return 0, nil
}
The pass marks "return struct" {tt TypeID, err error} as used,
and this causes internal check failure.
I've added the test to:
https://golang.org/cl/6525052/diff/7020/src/pkg/runtime/race/regression_test.go

R=golang-dev, minux.ma, rsc
CC=golang-dev
https://golang.org/cl/6611049

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/6632051

It's already there but only in the "for instance" and so not
clear enough: deferred functions run after
the result parameters are updated.

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/6631058

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/6631059

R=golang-dev, edsrzf
CC=golang-dev
https://golang.org/cl/6633051

R=gri, dsymonds, skybrian
CC=golang-dev
https://golang.org/cl/6631057

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/6633050

Also:

- Refactored testing framework to permit easier
idempotency testing.

- Applied gofmt -w src misc

This CL depends on CL 6639044 being applied first.

Formatting is not idempotent for all files: In those
files the comment position has changed (due to missing
precise location information) and/or the comment formatting
cannot/is not aware of independent code re-formatting.
In general it is very hard to make format idempotent when
running it in one pass only. Leaving that aside for now.

Fixes #1835.

R=r, rsc
CC=golang-dev
https://golang.org/cl/6624051

Preparation for forthcoming CL 6624051: Will make it
easier to see if/what changes are incurred by it.

The alignment changes in this CL are due to CL 6610051
(fix to alignment heuristic) where it appears that an
old version of gofmt was run (and thus the correct
alignment updates were not done).

R=r
CC=golang-dev
https://golang.org/cl/6639044

Background on build ID:
http://fedoraproject.org/wiki/RolandMcGrath/BuildID

R=rsc
CC=golang-dev
https://golang.org/cl/6625072

R=golang-dev, minux.ma
CC=golang-dev
https://golang.org/cl/6632053

R=golang-dev
CC=golang-dev
https://golang.org/cl/6631054

I typoed the code and tried to parse all the way to the end of the
message. Therefore it fails when NPN is not the last extension in the
ServerHello.

Fixes #4088.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/6637052

Fixes #4212.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/6641050

1. correctly initialize .plt.got entries (point to the 1st entry)
2. add section .rel.plt (FreeBSD insists PLT relocs to be there)
3. put relocs of .got.plt into .rel.plt
4. set ELFOSABI_FREEBSD in ELF header

R=rsc
CC=golang-dev
https://golang.org/cl/6643050