Fixes #2838.

R=rsc, r
CC=golang-dev
https://golang.org/cl/5651060

R=go.peter.90, n13m3y3r, gustavo
CC=golang-dev
https://golang.org/cl/5655053

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5645085

Fixes #2927.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5651062

Fixes #2939.

R=rsc, r
CC=golang-dev
https://golang.org/cl/5655050

Should be obviously correct.  Includes minimal test case.
A future CL should clear up the logic around typecheckok and importpkg != nil someday.

R=rsc, dsymonds, rsc
CC=golang-dev
https://golang.org/cl/5652057

make syscall.ProcAttr.Files be []uintptr

all.bash passes on Linux.
things seem to compile on GOOS={darwin,windows}

R=golang-dev, mattn.jp, alex.brainman, rsc
CC=golang-dev
https://golang.org/cl/5653055

Fixes #2932

R=gri
CC=golang-dev
https://golang.org/cl/5654046

- Added test case for issue 1542.

Fixes #1542.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5645080

If a printer is configured with the SourcePos mode
set, it will emit //-line comments as necessary to
ensure that the result - if reparsed - reflects the
original source position information.

This change required a bit of reworking of the
output section in printer.go. Specifically:

- Introduced new Config mode 'SourcePos'.

- Introduced new position 'out' which tracks the
position of the generated output if it were read
in again. If there is a discrepancy between out
and the current AST/source position, a //line
comment is emitted to correct for it.

- Lazy emission of indentation so that //line
comments can be placed correctly. As a result,
the trimmer will have to do less work.

- Merged writeItem into writeString.

- Merged writeByteN into writeByte.

- Use a []byte instead of a byte.Buffer both in the
printer and in the trimmer (eliminates dependency).

Also: introduced explicit printer.Mode type (in
sync w/ parser.Mode, scanner.Mode, etc.)

Runs all tests. Applied gofmt to src, misc w/o changes.

Fixes #1047.
Fixes #2697.

R=rsc, rsc
CC=golang-dev
https://golang.org/cl/5643066

(*Writer, error) if they take a compression level, and *Writer otherwise.
Rename gzip's Compressor and Decompressor to Writer and Reader, similar to
flate and zlib.

Clarify commentary when writing gzip metadata that is not representable
as Latin-1, and fix io.EOF comment bug.

Also refactor gzip_test to be more straightforward.

Fixes #2839.

R=rsc, r, rsc, bradfitz
CC=golang-dev
https://golang.org/cl/5639057

Actually %GOBUILDEXIT% I suppose.

R=golang-dev
CC=golang-dev
https://golang.org/cl/5651058

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5651057

not sure that it will work, but.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5649051

Relax. It's still in macho.go.

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/5653054

Fixes #2954.

R=golang-dev, bradfitz, rsc, r
CC=golang-dev
https://golang.org/cl/5645077

Fixes #2940.

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/5645078

This is for filling a column with "fail", like I just did for
Windows, when the builder would get stuck running that
build.  (We have safeguards against the tests getting stuck
but this was the bootstrap build getting stuck.)

I usually use -cmd=/bin/false, but this avoids the Mercurial
checkouts, which means it runs instantly instead of requiring
~1 minute per "fail".

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/5649049

Fixes #2931.

R=golang-dev, alex.brainman
CC=golang-dev, rsc
https://golang.org/cl/5651049

Fixes #2952.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5651054

Fixes #2948

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5655048

Fixes #2957.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5653053

Fixes #2960.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5652055

Fixes #2959.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5651053

Dead code.

Fixes #2961.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5650053

The comment on IsOneOf regarding Latin-1 was an implementation detail:
when the function is called internally, that condition is true. It used to matter,
but now the comment is a dreg. The function works fine if the character is
Latin-1, so we just delete the comment.

Fixes #2966.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5655047

Fixes #2963.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5650051

Delete O_NDELAY, O_NONBLOCK, O_NOCTTY, O_ASYNC.

Clean up some docs.

Rename ShellExpand -> ExpandEnv.

Make NewFile take a uintptr; change File.Fd to return one.
(for API compatibility between Unix and Windows)

Fixes #2947

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5655045

Also replace archaic definition of rune.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5654048

Fixes #2965.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5652054

Fixes #2958.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5650050

Fixes #2974.

R=golang-dev, r, rsc
CC=golang-dev
https://golang.org/cl/5653052

Part of issue 2947

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5651051

Fixes #2942

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5650049

Fixes #2962.

R=rsc
CC=golang-dev
https://golang.org/cl/5652048

Fixes #2953

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5653051

Also fix a doc error.

Fixes #2843

R=golang-dev, r, rsc
CC=golang-dev
https://golang.org/cl/5653050

godoc doesn't have the fu to present the example well, but this gives
us an example of an example to develop example fu.

Fixes #2840.

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/5645063

For gccgo. Also removes bunch of special cases.

Fixes #2906

R=golang-dev, remyoudompheng
CC=golang-dev
https://golang.org/cl/5644050

Fixes #2039

R=r, rsc, n13m3y3r, r, rogpeppe
CC=golang-dev
https://golang.org/cl/5643067