* allow commit watcher to be disabled, useful for small slow builders who will never be the first to notice a commit.
* builders always update their local master working copy before cloning a specific revision.
* refactor hg repo operations into a new type, Repo.

R=adg, shanemhansen, luitvd
CC=golang-dev
https://golang.org/cl/7326053

Minor simplification of gcimporter, removed TODO.

R=adonovan
CC=golang-dev
https://golang.org/cl/7363044

Fixes #4852

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/7374045

R=nigeltao
CC=golang-dev
https://golang.org/cl/7399044

Simplifies the contract for Driver.Stmt.Close in
the process of fixing issue 3865.

Fixes #3865
Update #4459 (maybe fixes it; uninvestigated)

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/7363043

Fixes #4435.

R=golang-dev, iant, alex.brainman, minux.ma, dvyukov
CC=golang-dev
https://golang.org/cl/7304104

Mimic the Emacs convention of presenting read-only files meant
for browsing using view-mode, rather than Fundamental mode
which mistakenly allows editing of the "godoc" content.
Fixes #4322.

R=golang-dev, bradfitz, sameer
CC=golang-dev
https://golang.org/cl/7231055

Generated by addca.

R=gobot
CC=golang-dev
https://golang.org/cl/7377045

Fixes #4112.

R=remyoudompheng, daniel.morsing, dave, rsc
CC=golang-dev
https://golang.org/cl/7085053

Generated by addca.

R=gobot
CC=golang-dev
https://golang.org/cl/7400045

Also close the file when we're done.

R=bradfitz
CC=golang-dev
https://golang.org/cl/7363045

Apply width when using Printf with nil values.
Fixes #4772.

R=r, adg
CC=golang-dev
https://golang.org/cl/7314114

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/7386045

R=rsc
CC=golang-dev
https://golang.org/cl/7385045

R=rsc
CC=golang-dev
https://golang.org/cl/7381046

(per r's suggestion)

R=r
CC=golang-dev
https://golang.org/cl/7376045

Add a new, simple interface for scanning (probably textual) data,
based on a new type called Scanner. It does its own internal buffering,
so should be plausibly efficient even without injecting a bufio.Reader.
The format of the input is defined by a "split function", by default
splitting into lines. Other implemented split functions include single
bytes, single runes, and space-separated words.

Here's the loop to scan stdin as a file of lines:

        s := bufio.NewScanner(os.Stdin)
        for s.Scan() {
                fmt.Printf("%s\n", s.Bytes())
        }
        if s.Err() != nil {
                log.Fatal(s.Err())
        }

While we're dealing with spaces, define what space means to strings.Fields.

Fixes #4802.

R=adg, rogpeppe, bradfitz, rsc
CC=golang-dev
https://golang.org/cl/7322088

(Offsetof is a function of Alignof and Sizeof.)

- removed IntSize, PtrSize from Context (set Sizeof instead)
- GcImporter needs a Context now (it needs to have
  access to Sizeof/Alignof)
- removed exported Size field from Basic (use Sizeof)
- added Offset to Field
- added Alignment, Size to Struct

R=adonovan
CC=golang-dev
https://golang.org/cl/7357046

Can not happen ATM. In preparation for the new scheduler.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/7388043

In preparation for the new scheduler.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/7386044

This is followup to https://golang.org/cl/7319050/

R=golang-dev, dave
CC=golang-dev
https://golang.org/cl/7379043

Fixes #4819.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/7322086

The removed code leads to the situation when M executes the same locked G again
and again.
This is https://golang.org/cl/7310096 but with return instead of break
in the nested switch.
Fixes #4820.

R=golang-dev, alex.brainman, rsc
CC=golang-dev
https://golang.org/cl/7304102

The Camlistore code tree rearranged after the go tool came
out. (I didn't know this link was here until I saw it in
some logs.)

R=adg
CC=golang-dev
https://golang.org/cl/7374043

On Windows, directory names in PATH can be fully or partially quoted
in double quotes ('"'), but the path names as used by most APIs must
be unquoted. In addition, quoted names can contain the semicolon
(';') character, which is otherwise used as ListSeparator.

This CL changes SplitList in path/filepath and LookPath in os/exec
to only	treat unquoted semicolons as separators, and to unquote the
separated elements.

(In addition, fix harmless test bug I introduced for LookPath on Unix.)

Related discussion thread:
https://groups.google.com/d/msg/golang-nuts/PXCr10DsRb4/sawZBM7scYgJ

R=rsc, minux.ma, mccoyst, alex.brainman, iant
CC=golang-dev
https://golang.org/cl/7181047

Fixes #4844.

R=golang-dev, alex.brainman
CC=golang-dev
https://golang.org/cl/7366043

R=r, golang-dev
CC=golang-dev
https://golang.org/cl/7327053

The data file should be opened when a Conn is first
established, rather than waiting for the first Read or
Write.

Upon Close, we now make sure to try to close both, the
ctl as well as data files and set both to nil, even in
the face of errors, instead of returning early.

The Accept call was not setting the remote address
of the connection properly. Now, we read the correct
file.

Make functions that establish Conn use newTCPConn
or newUDPConn.

R=rsc, rminnich, ality, dave
CC=golang-dev
https://golang.org/cl/7228068

This CL changes nothing to existing API behavior, just sets up
Zone in IPNet and IPAddr structures if possible.

Also does small simplification.

Update #4234.

R=rsc, dave
CC=golang-dev
https://golang.org/cl/7300081

On Linux point-to-point interface an IFA_ADDRESS attribute
represents a peer address. For a correct interface address
we should take an IFA_LOCAL attribute instead.

Fixes #4839.

R=golang-dev, dave, rsc
CC=golang-dev
https://golang.org/cl/7352045

This avoids ambiguity and makes the diagnostics closer to
those issued by gc, but it is more verbose since it qualifies
intra-package references.

Without extra context---e.g. a 'from *Package' parameter to
Type.String()---we are forced to err on one side or the other.

Also, cosmetic changes to exp/ssa:
- Remove package-qualification workaround in Function.FullName.
- Always set go/types.Package.Path field to the import path,
  since we know the correct path at this point.
- In Function.DumpTo, show variadic '...' and result type info,
  and delete now-redundant "# Type: " line.

R=gri
CC=golang-dev
https://golang.org/cl/7325051

R=golang-dev, dsymonds, bradfitz
CC=golang-dev
https://golang.org/cl/7323073

Also:
- faster code for example extraction
- simplify handling of command documentation:
  all "main" packages are treated as commands
- various minor cleanups along the way

For commands written in Go, any doc.go file containing
documentation must now be part of package main (rather
then package documentation), otherwise the documentation
won't show up in godoc (it will still build, though).

For commands written in C, documentation may still be
in doc.go files defining package documentation, but the
recommended way is to explicitly ignore those files with
a +build ignore constraint to define package main.

Fixes #4806.

R=adg, rsc, dave, bradfitz
CC=golang-dev
https://golang.org/cl/7333046

R=golang-dev, bradfitz, minux.ma
CC=golang-dev
https://golang.org/cl/7291043

This comment matches the one in path.

Fixes #4837.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/7305100

side expression evaluation in assignment operations.

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/7349046

ref: http://www.dwarfstd.org/doc/DWARF4.pdf

Update #4829

R=minux.ma, iant
CC=dave, golang-dev
https://golang.org/cl/7354043

Slightly better benchmarks for when string and separator are equivalent and also less branching in inner loops.
benchmark                        old ns/op    new ns/op    delta
BenchmarkGenericNoMatch               3430         3442   +0.35%
BenchmarkGenericMatch1               23590        22855   -3.12%
BenchmarkGenericMatch2              108031       105025   -2.78%
BenchmarkSingleMaxSkipping            2969         2704   -8.93%
BenchmarkSingleLongSuffixFail         2826         2572   -8.99%
BenchmarkSingleMatch                205268       197832   -3.62%
BenchmarkByteByteNoMatch               987          921   -6.69%
BenchmarkByteByteMatch                2014         1749  -13.16%
BenchmarkByteStringMatch              3083         3050   -1.07%
BenchmarkHTMLEscapeNew                 922          915   -0.76%
BenchmarkHTMLEscapeOld                1654         1570   -5.08%
BenchmarkByteByteReplaces            11897        11556   -2.87%
BenchmarkByteByteMap                  4485         4255   -5.13%
BenchmarkIndexRune                     174          121  -30.46%
BenchmarkIndexRuneFastPath              41           41   -0.24%
BenchmarkIndex                          45           44   -0.22%
BenchmarkMapNoChanges                  433          431   -0.46%
BenchmarkIndexHard1                4015336      3316490  -17.40%
BenchmarkIndexHard2                3976254      3395627  -14.60%
BenchmarkIndexHard3                3973158      3378329  -14.97%
BenchmarkCountHard1                4403549      3448512  -21.69%
BenchmarkCountHard2                4387437      3413059  -22.21%
BenchmarkCountHard3                4403891      3382661  -23.19%
BenchmarkIndexTorture                28354        25864   -8.78%
BenchmarkCountTorture                29625        27463   -7.30%
BenchmarkFields                   38752040     39169840   +1.08%
BenchmarkFieldsFunc               38797765     38888060   +0.23%

benchmark                         old MB/s     new MB/s  speedup
BenchmarkSingleMaxSkipping         3367.07      3697.62    1.10x
BenchmarkSingleLongSuffixFail       354.51       389.47    1.10x
BenchmarkSingleMatch                 73.07        75.82    1.04x
BenchmarkFields                      27.06        26.77    0.99x
BenchmarkFieldsFunc                  27.03        26.96    1.00x

R=dave, fullung, remyoudompheng, rsc
CC=golang-dev
https://golang.org/cl/7350045

Generated by addca.

R=gobot
CC=golang-dev
https://golang.org/cl/7351046

If Python blocks in the SSL handshake it seems to be
completely uninterruptible, and I've been seeing it
block for at least hours recently. I don't know if the
problem is on the client side or the server side or
somewhere in the network, but setting the timeout
at least means you're guaranteed a new shell prompt
(after printing some errors).

R=golang-dev, bradfitz, minux.ma
CC=golang-dev
https://golang.org/cl/7337048