This CL adds compatibility for GNU Emacs 23 (fixing fontification
issues) and XEmacs >=21.5.32 (fixing a lot of issues). Earlier
versions of XEmacs will not be supported because they do not
support POSIX character classes. Because of that, we also make use
of a lot of functions that were added in 21.5.32.

A known and currently unfixable issue with XEmacs is that go-mode
will not always fontify identifiers that use unicode correctly.

All changes for XEmacs are annotated in the diff.

Note: go--position-bytes is not currently used anywhere, but will
be in a future CL.

Fixes #4927.

R=golang-dev, adonovan, cw, patrick.allen.higgins, sameer
CC=golang-dev
https://golang.org/cl/7456051

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/7518044

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/7489044

Previously the HTTP client's (*Response).Body.Close would try
to keep reading until EOF, hoping to reuse the keep-alive HTTP
connection, but the EOF might never come, or it might take a
long time. Now we immediately close the TCP connection if we
haven't seen EOF.

This shifts the burden onto clients to read their whole response
bodies if they want the advantage of reusing TCP connections.

In the future maybe we could decide on heuristics to read some
number of bytes for some max amount of time before forcefully
closing, but I'd rather not for now.

Statistically, touching this code makes things regress, so I
wouldn't be surprised if this introduces new bugs, but all the
tests pass, and I think the code is simpler now too. Maybe.

Please test your HTTP client code before Go 1.1.

Fixes #3672

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/7419050

necessarily contain all components.

Fixes #4975.

R=r, minux.ma, bradfitz
CC=golang-dev
https://golang.org/cl/7469043

The only check so far is for self-assignments of the form "expr = expr",
but even that found one instance in the standard library.

R=r, adg, mtj, rsc
CC=golang-dev
https://golang.org/cl/7455048

Fixes #4980.

R=golang-dev, rsc, dsymonds
CC=golang-dev
https://golang.org/cl/7479044

Drop the phrase "reference types", which has caused confusion.
Add a section about 2D arrays, a common newbie question.

R=golang-dev, cespare, adg, rsc
CC=golang-dev
https://golang.org/cl/7423051

broke arm garbage collector

traceback_arm fails with a missing pc. It needs CL 7494043.
But that only makes the build break later, this time with
"invalid freelist". Roll back until it can be fixed correctly.

««« original CL description
runtime: restrict stack root scan to locals and arguments

R=rsc
CC=golang-dev
https://golang.org/cl/7301062
»»»

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/7493044

- run time is limited if -short is set
- also added missing TODO to unrelated file return.go

R=r
CC=golang-dev
https://golang.org/cl/7448052

On OpenBSD 5.2, calling getsockname on an unbound Unix domain socket
results in a successful syscall, however the AF is unset and the length
is returned as zero. This has been changed to more portable behaviour,
which will be included in the OpenBSD 5.3 release.

For now, work around this by treating a successful getsockname() call
that returns a family of AF_UNSPEC and length of zero as a AF_UNIX
socket.

Makes TestPassFD work on OpenBSD 5.2.

Fixes #4956.

R=golang-dev, minux.ma, rsc, mikioh.mikioh
CC=golang-dev
https://golang.org/cl/7449046

It will be handy for network poller.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/7429048

Fixes #4893.
Actually it's fixed by cl/7314062 (improved scheduler),
just submitting the test.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/7422054

In preparation for integrated network poller
(https://golang.org/cl/7326051),
this is required to handle deadlines.

R=golang-dev, remyoudompheng, rsc
CC=golang-dev
https://golang.org/cl/7446047

R=rsc
CC=golang-dev
https://golang.org/cl/7301062

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/7431054

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/7416050

Implementation closely based on Russ' CL 7440047.

Future work: The error messages could be better
(e.g., instead of "missing return" it might say
"missing return (no default in switch)", etc.).

R=adonovan, rsc
CC=golang-dev
https://golang.org/cl/7437049

Fixes #65.

R=ken2
CC=golang-dev
https://golang.org/cl/7441049

The only functional change is the new section
on terminating statements.

There is a minor syntax rewrite (not change)
of function declarations to make it easier to
refer to the notion of a function from all places
where it is used (function decls, method decls,
and function literals).

Includes some minor fixes/additions of missing links.

Based closely on Russ' proposal.

Fixes #65.

R=rsc, r, iant, ken, bradfitz
CC=golang-dev
https://golang.org/cl/7415050

Fixes #4976.

R=r
CC=golang-dev
https://golang.org/cl/7421050

R=golang-dev, adonovan, bradfitz, cw, patrick.allen.higgins, sameer, ugorji
CC=golang-dev
https://golang.org/cl/7373051

to reduce compile time memory/stack usage.
Update #4970
$ go test -c ../test/bench/go1
before:
0.36user 0.07system 0:00.44elapsed 100%CPU
(0avgtext+0avgdata 540720maxresident)k
0inputs+19840outputs (0major+56451minor)pagefaults 0swaps
after:
0.33user 0.05system 0:00.39elapsed 100%CPU
(0avgtext+0avgdata 289936maxresident)k
0inputs+19864outputs (0major+29615minor)pagefaults 0swaps

And stack usage is reduced to below 1MiB.

R=golang-dev, r, dave
CC=golang-dev
https://golang.org/cl/7436050

Fixes #4969

R=golang-dev, minux.ma
CC=golang-dev
https://golang.org/cl/7456049

Using -import_runtime_cgo would have worked great except
that it doesn't get passed to the second invocation of cgo,
and that's the one that writes the relevant file.

Fixes ARM build on systems with a different dynamic linker
than the one 5l assumes (like Gentoo).

R=golang-dev, minux.ma
CC=golang-dev
https://golang.org/cl/7432048

Use a 17 MB payload instead of a 1 MB payload, since
OS X can apparently buffer up to 16 MB in its pipes.

Fixes #4958 maybe

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/7453049

Fixes #4941.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/7415051

If the constant CollectStats is non-zero and GOGCTRACE=1
the garbage collector will print basic statistics about executed
GC instructions.

R=golang-dev, dvyukov
CC=golang-dev, rsc
https://golang.org/cl/7413049

Fixes #4882.
Fixes #4936.
Fixes #4937.

R=golang-dev, dave, daniel.morsing, rsc
CC=golang-dev
https://golang.org/cl/7432044

R=golang-dev, dvyukov
CC=golang-dev
https://golang.org/cl/7435053

Fixes #4932.

R=golang-dev, dave, rsc
CC=golang-dev
https://golang.org/cl/7437043

R=golang-dev, remyoudompheng, bradfitz
CC=golang-dev
https://golang.org/cl/7419049

Don't check out the repository if we're just going to fail everything.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/7453048

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/7450052

The old code would decode the palette only for 8-bit
images during a DecodeConfig.
This CL keeps the behavior for 8-bit images and sets
up the decoded palette also for 1, 2 and 4-bit images.

Fixes #4279.

R=golang-dev, nigeltao
CC=golang-dev
https://golang.org/cl/7421048

Fixes the App Engine version of godoc. The other fix is to duplicate
this code inside appinit.go. I think initHandlers is the right place
to put the strings.Split call, as the notesToShow var is used by
docServer, which is what initHandlers sets up.

R=dsymonds
CC=golang-dev
https://golang.org/cl/7434044

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/7423050

Fixes build on Plan 9 and Windows.

R=golang-dev, minux.ma
CC=golang-dev
https://golang.org/cl/7454049

R=golang-dev, minux.ma
CC=golang-dev
https://golang.org/cl/7429049

Also replaces testing.Errof with testing.Fatalf, make use of ICMP mock.

R=golang-dev, dave
CC=golang-dev
https://golang.org/cl/7308058