Similar to bug190, but without recursive reference.  Crashed
gccgo.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5672053

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5672052

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5672050

    CL 5666043 fixed the same checking for 5g.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5666045

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5671051

R=rsc, iant, iant
CC=golang-dev
https://golang.org/cl/5656058

return (*Template, error), not just *Template.

Fixes #2757.

R=r
CC=golang-dev
https://golang.org/cl/5665044

Just an oversight they didn't work and easy to address.

Fixes #3025.

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/5656059

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5671049

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/5676046

Fixes #2979.

R=rsc, r
CC=golang-dev
https://golang.org/cl/5664046

R=golang-dev, mpimenov, alex.brainman
CC=golang-dev
https://golang.org/cl/5667045

R=golang-dev, adg, r, bradfitz
CC=golang-dev
https://golang.org/cl/5675054

R=bradfitz, dsymonds
CC=golang-dev
https://golang.org/cl/5675056

R=golang-dev, dsymonds, r, mikioh.mikioh
CC=golang-dev
https://golang.org/cl/5675055

use ':' instead of ';' to keep consistency with the other panic strings

R=golang-dev, dsymonds, r
CC=golang-dev
https://golang.org/cl/5666048

R=r, bradfitz
CC=golang-dev, rogpeppe
https://golang.org/cl/5673049

When I build it, I got:
/home/njubee/work/golang/doc/codewalk/markov.go:124: undefined: time.Nanoseconds
time.Nanoseconds() does not exist now, use time.Now().UnixNano() instead

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/5668044

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/5677046

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/5649087

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/5672048

R=golang-dev, adg, bradfitz, r
CC=golang-dev
https://golang.org/cl/5675053

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/5677043

Changeset 36c9c7810f14 broke support for grsec-patched kernels.
Those do not give back the address requested without MAP_FIXED,
so when verifying an mmap without this flag for success, the
resulting address must not be compared against the requested
address since it may have succeeded at a different location.

R=golang-dev, rsc, gustavo, iant
CC=golang-dev
https://golang.org/cl/5650072

copy of strings/reader{,_test}.go with
a few s/string/[]byte/

Fixes #2861

R=adg, rsc, r
CC=golang-dev
https://golang.org/cl/5666044

Apparently some distros don't let you ptrace attach
to your own existing processes.

Run strace on the child directly, instead, which
reportedly is more often allowed, and makes the
code simpler too.

R=golang-dev, n13m3y3r
CC=golang-dev
https://golang.org/cl/5675050

R=gri
CC=golang-dev
https://golang.org/cl/5675049

Before this, make.bash --dist-tool would fail,
because $GOROOT/bin/tool was being mkdir'd
instead of $GOROOT/pkg/tool/linux_amd64.

R=rsc
CC=golang-dev
https://golang.org/cl/5666046

- if a package path leads to subdirectories only,
  show command instead, if any
- to force documentation for a command, use the
  cmd/ prefix, as in: godoc cmd/go
  (note that for the go command, the prefix is
  not required since there is no actual go library
  package at the moment)

Fixes #3012.

R=rsc
CC=golang-dev
https://golang.org/cl/5665049

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5647063

* add -work option to save temporary files (Fixes issue 2980)
* fix go test -i to work with cgo packages (Fixes issue 2936)
* do not overwrite/remove empty directories or non-object
  files during build (Fixes issue 2829)
* remove package main vs package non-main heuristic:
  a directory must contain only one package (Fixes issue 2864)
* to make last item workable, ignore +build tags for files
  named on command line: go build x.go builds x.go even
  if it says // +build ignore.
* add // +build ignore tags to helper programs

R=golang-dev, r, r
CC=golang-dev
https://golang.org/cl/5674043

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5669046

                                   before   after
go test -short time                4.144s  1.215s
go test -short runtime             1.315s  0.351s
go test -short -cpu=1,2,4 runtime  4.376s  1.266s

Partially solves issue 3015.

R=golang-dev, r
CC=golang-dev, remy
https://golang.org/cl/5673045

Also eliminate some warnings in builds.

R=golang-dev, fullung, iant, rsc
CC=golang-dev, remy
https://golang.org/cl/5650066

This lets us get rid of the OS-dependent implementations
of SyscallError.  The name "Err" was chosen to match the
PathError type.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5651084

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/5649089

Also added -files flag to provide regexp for test files for
selective testing.

Fixes #2956.

R=rsc
CC=golang-dev
https://golang.org/cl/5657045

This CL avoids net.Listen("tcp", ":80"), http.ListenAdnServe(":80")
prefer an IPv6 listen.

R=rsc
CC=golang-dev
https://golang.org/cl/5669043

        also fixes this bug in net/http/httptest.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5654083

This change shows all the information present
in the Time value (now including fractional seconds)
and also arranges the fields so that, within a single time zone,
string comparison and time comparison agree.

R=golang-dev, rogpeppe, r
CC=golang-dev
https://golang.org/cl/5654078