This should go in after Brad's CL 5553064.

R=bradfitz, rsc
CC=golang-dev
https://golang.org/cl/5555056

Also: Avoid potential crash due to reslicing of nil buffer.

R=r
CC=golang-dev
https://golang.org/cl/5556075

R=golang-dev, dsymonds, gri
CC=golang-dev
https://golang.org/cl/5557076

R=iant
CC=golang-dev
https://golang.org/cl/5555062

This should make it easier to add the zillion little changes coming.
No content change here beyond a couple of introductory sentences.
Sections have been moved wholesale without editing them.

R=golang-dev, rsc, gri
CC=golang-dev
https://golang.org/cl/5557074

Preserve test.

changeset:   11593:f1deaf35e1d1
user:        Luuk van Dijk <lvd@golang.org>
date:        Tue Jan 17 10:00:57 2012 +0100
summary:     gc: fix infinite recursion for embedded interfaces

This is causing 'interface type loop' errors during compilation
of a complex program.  I don't understand what's happening
well enough to boil it down to a simple test case, but undoing
this change fixes the problem.

The change being undone is fixing a corner case (uses of
pointer to interface in an interface definition) that basically
only comes up in erroneous Go programs.  Let's not try to
fix this again until after Go 1.

Unfixes issue 1909.

TBR=lvd
CC=golang-dev
https://golang.org/cl/5555063

Fixes #2743.

R=golang-dev, gri, r
CC=golang-dev
https://golang.org/cl/5556072

Fixes #2748.

R=rsc, r, r
CC=golang-dev
https://golang.org/cl/5557072

R=r
CC=golang-dev
https://golang.org/cl/5555060

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5557069

Fixes #2623.

R=rsc, bradfitz
CC=golang-dev
https://golang.org/cl/5533043

        We already use GOHOSTOS to represent the host OS that the toolchain
        will be run on, so no need to resort to uname(1) to get that (and
        use uname(1) will make cross-compiling for another host impossible).

R=rsc, golang-dev
CC=golang-dev
https://golang.org/cl/5530050

Was added to CONTRIBUTORS file in:

changeset:   7092:638ad4d7d280
user:        Berengar Lehr <Berengar.Lehr@gmx.de>
date:        Tue Jan 11 20:51:35 2011 -0500
summary:     crypto: add twofish package

but never added to AUTHORS file.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5532107

Fixes #2566.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5541068

R=golang-dev, gri, r
CC=golang-dev
https://golang.org/cl/5561047

Fixes #2701.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5556070

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/5553049

BenchmarkChanSem old=127ns new=78.6ns

R=golang-dev, bradfitz, sameer, rsc
CC=golang-dev
https://golang.org/cl/5558049

R=dsymonds
CC=golang-dev
https://golang.org/cl/5558059

R=r
CC=golang-dev
https://golang.org/cl/5557067

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5558056

- use proper Win64 gcc calling convention when
  calling initcgo on amd64
- increase g0 stack size to 64K on amd64 to make
  it the same as 386
- implement C.sleep
- do not use C.stat, since it is renamed to C._stat by mingw
- use fopen to implement TestErrno, since C.strtol
  always succeeds on windows
- skip TestSetEnv on windows, because os.Setenv
  sets windows process environment, while C.getenv
  inspects internal C runtime variable instead

R=golang-dev, vcc.163, rsc
CC=golang-dev
https://golang.org/cl/5500094

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5536076

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5528109

Fixes #2733

R=chickencha, ality, rsc
CC=golang-dev
https://golang.org/cl/5553064

instead of the origin.

This makes YCbCr match the other image types (e.g. RGBA, Gray) in
that an image's bounds is not restricted to the positive quadrant.

Also optimize the YCbCr draw code by hoisting some computation
outside of the loop.

benchmark              old ns/op    new ns/op    delta
draw.BenchmarkYCbCr      2544418      2373558   -6.72%

Like https://golang.org/cl/4681044/ I don't think a gofix is
feasible. People will have to make manual changes. On the other hand,
directly manipulating YCbCr images is relatively rare, compared to
RGBA images, and if other code just uses the jpeg and draw packages
instead of messing directly with a YCbCr's []byte representations,
then things should just continue to work.

R=r
CC=golang-dev
https://golang.org/cl/5558048

R=golang-dev, alex.brainman
CC=golang-dev
https://golang.org/cl/5532102

R=rsc, bradfitz
CC=golang-dev
https://golang.org/cl/5536068

Remove NewMD5, NewSHA1 and NewSHA256 in favor of using New and
explicitly importing the used hash-function. This way when using, for
example, HMAC with RIPEMD there's no md5, sha1 and sha256 linked in
through the hmac package.

A gofix rule is included, and applied to the standard library (3 files
altered).

This change is the result of a discussion at
https://golang.org/cl/5550043/ to pull the discussion about
deprecating these functions out of that issue.

R=golang-dev, agl
CC=golang-dev, r, rsc
https://golang.org/cl/5556058

Fixes #2660.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5557060

Fix originally from rogpeppe in 5414048 but was rolled
back due to test breakage.

This CL makes the test more robust to order of operations.

Fixes #2480 again.

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/5536072

R=golang-dev, bsiegert, r
CC=golang-dev
https://golang.org/cl/5549043

R=rsc
CC=golang-dev
https://golang.org/cl/5542052

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5532100

Thanks to 0xE2.0x9A.0x9B for the patch suggestion.

Fixes #2739.

R=r
CC=golang-dev
https://golang.org/cl/5536071

The previous version of all the node.String methods printed the parse
tree and was useful for developing the parse tree code. Now that that's done,
we might as well print the nodes using the standard template syntax.
It's much easier to read and makes error reporting look more natural.

Helps issue 2644.

R=rsc, n13m3y3r
CC=golang-dev
https://golang.org/cl/5553066

SysUnused is a direct call to madvise MADV_FREE.

R=sebastien.paolacci, rsc, minux.ma
CC=golang-dev
https://golang.org/cl/5531073

Redirect to the canonical path when the old path is accessed.

R=gri
CC=golang-dev
https://golang.org/cl/5536061

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5539063

        So as to give out stack trace for panic in examples.
        This behavior also matches the tests'.
        Fixes #2691.

R=golang-dev
CC=golang-dev
https://golang.org/cl/5554061