Suggested by Paul Borman.

R=golang-dev, mikioh.mikioh
CC=golang-dev
https://golang.org/cl/6930043

* note end-of-line and EOF behavior for ReadLine
* diagnose broken Readers

Fixes #3825.
Fixes #4276.

R=golang-dev, dave
CC=golang-dev
https://golang.org/cl/6907060

Fixes #3666.
Fixes #3680.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/6899054

Fixes #4490

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/6924044

We have been using all three terms "indices", "indexes",
and "index expressions" indiscriminatly for index values.
With this change, "index" refers to an index value,
"indices" is the plural of "index", and "index expression"
refers to an array, slice, or map indexed by an index: a[x].

R=r, rsc, iant, ken, mtj
CC=golang-dev
https://golang.org/cl/6912056

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/6912062

R=mikioh.mikioh, rsc
CC=golang-dev
https://golang.org/cl/6900050

Fixes #4512.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/6917043

Also fix spurious & in example.

Fixes #4349.
Fixes #4489.

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/6905058

Can happen in both request and response.
Also use it in one place that wasn't.

Fixes #3997.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/6903057

Fixes #4492.

% go version
go version devel +6b602ab487d6 Sat Dec 08 14:43:00 2012 +0100 linux/amd64

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/6906058

R=golang-dev, dave, rsc
CC=golang-dev
https://golang.org/cl/6904061

The reported decrease in memory usage is about 5%.

R=golang-dev, dave, rsc
CC=golang-dev
https://golang.org/cl/6902064

New in Go 1 will be nanosecond precision in the result of time.Now on Linux.
This will break code that stores time in external formats at microsecond
precision, reads it back, and expects to get exactly the same time.

Code like that can be fixed by using time.Now().Round(time.Microsecond)
instead of time.Now() in those contexts.

R=golang-dev, bradfitz, iant, remyoudompheng
CC=golang-dev
https://golang.org/cl/6903050

Fixes #4252.

R=rsc, golang-dev, mirtchovski, daniel.morsing, dave, lvd
CC=golang-dev
https://golang.org/cl/6856126

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/6901056

This makes sure the outputs do not change for a fixed seed.
See also https://golang.org/cl/6905049.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/6907048

This changes the output of

rand.Seed(0)
perm := rand.Perm(100)

When giving the same seeds to Go 1.0 and Go 1.1 programs
I would like them to generate the same random numbers.

««« original CL description
math/rand: remove noop iteration in Perm

The first iteration always do `m[0], m[0] = m[0], m[0]`, because
`rand.Intn(1)` is 0.

fun note: IIRC in TAOCP version of this algorithm, `i` goes
backward (n-1->1), meaning that the "already" shuffled part of the
array is never altered betweens iterations, while in the current
implementation the "not-yet" shuffled part of the array is
conserved between iterations.

R=golang-dev
CC=golang-dev
https://golang.org/cl/6845121

»»»

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/6905049

R=rsc
CC=golang-dev
https://golang.org/cl/6889052

Fixes #4457.

R=rsc, iant, r, ken
CC=golang-dev
https://golang.org/cl/6862046

gotype can now handle much of the standard library.

- marked packages which have type checker issues
- this CL depends on CL 6846131

R=rsc
CC=golang-dev
https://golang.org/cl/6850130

Also:
- better handling of type assertions
- implemented built-in error type
- first cut at handling variadic function signatures
- several bug fixes

R=rsc, rogpeppe
CC=golang-dev
https://golang.org/cl/6846131

R=rsc
CC=golang-dev
https://golang.org/cl/6867062

The spec didn't preclude invalid type assertions and
type switches, i.e., cases where a concrete type doesn't
implement the interface type in the assertion in the first
place. Both, the gc and gccgo compiler exclude these cases.
This is documenting the status quo.

Also:
- minor clean up of respective examples
- added sentence about default case in select statements

Fixes #4472.

R=rsc, iant, r, ken
CC=golang-dev
https://golang.org/cl/6869050

Fixes #2615.

R=dave, minux.ma, iant, daniel.morsing, rsc
CC=golang-dev
https://golang.org/cl/6847078

Also fixes a necessary TODO in the process.

Fixes #4126

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/6869053

R=rsc, golang-dev
CC=golang-dev
https://golang.org/cl/6884046

The fixjmp step eliminates redundant chains of JMP
instructions that are produced by the compiler during
code generation.

It is already implemented in gc, and can be adapted to 6c/8c with
the exception that JMPs refer to destination by pc instead of by
pointer. The algorithm is modified to operate on Regs instead of Progs
for this reason. The pcs are already restored later by regopt.

R=goalng-dev, rsc
CC=golang-dev
https://golang.org/cl/6865046

Add missing file that should have been included in CL 6854063 / 5eac1a2d6fc3

R=remyoudompheng, minux.ma, rsc
CC=golang-dev
https://golang.org/cl/6891049

The 0-length part is fine, but some callers that write 0 bytes
also pass nil as the data pointer, and the Plan 9 kernel kills the
process with 'invalid address in sys call' in that case.

R=ken2
CC=golang-dev
https://golang.org/cl/6862051

R=gri
CC=golang-dev
https://golang.org/cl/6890047

Fixes #2458.

R=mikioh.mikioh, rsc
CC=golang-dev
https://golang.org/cl/6869054

R=golang-dev
CC=golang-dev
https://golang.org/cl/6883046

Fixes #2510

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/6867050

Per the curl man page, the http_proxy configuration can be
of the form:

   [protocol://]<host>[:port]

And we had a test that <ip>:<port> worked, but if
the host began with a letter, url.Parse parsed the hostname
as the scheme instead, confusing ProxyFromEnvironment.

R=golang-dev
CC=golang-dev
https://golang.org/cl/6875060

Used to say:

issue4251.go:12: inverted slice range
issue4251.go:12: constant -1 overflows uint64
issue4251.go:16: inverted slice range
issue4251.go:16: constant -1 overflows uint64
issue4251.go:20: inverted slice range
issue4251.go:20: constant -1 overflows uint64

With this patch, only gives the "inverted slice range" errors.

R=golang-dev, daniel.morsing
CC=golang-dev
https://golang.org/cl/6871058

Fixes #4396.

For fixed arrays larger than the unmapped page, agenr would general a nil check by loading the first word of the array. However there is no requirement for the first element of a byte array to be word aligned, so this check causes a trap on ARMv5 hardware (ARMv6 since relaxed that restriction, but it probably still comes at a cost).

Switching the check to MOVB ensures alignment is not an issue. This check is only invoked in a few places in the code where large fixed arrays are embedded into structs, compress/lzw is the biggest offender, and switching to MOVB has no observable performance penalty.

Thanks to Rémy and Daniel Morsing for helping me debug this on IRC last night.

R=remyoudompheng, minux.ma, rsc
CC=golang-dev
https://golang.org/cl/6854063

Fixes #4434.

This proposal replaces the previous CL 6855110. Due to issue 599, 64-bit atomic operations should probably be avoided, so use a sync.Mutex instead.

Benchmark comparisons against 025b9d070a85 on linux/386:

CL 6855110:

benchmark                        old ns/op    new ns/op    delta
BenchmarkTCPOneShot                 710024       727409   +2.45%
BenchmarkTCPOneShotTimeout          758178       768620   +1.38%
BenchmarkTCPPersistent              223464       228058   +2.06%
BenchmarkTCPPersistentTimeout       234494       242600   +3.46%

This proposal:

benchmark                        old ns/op    new ns/op    delta
BenchmarkTCPOneShot                 710024       718492   +1.19%
BenchmarkTCPOneShotTimeout          758178       748783   -1.24%
BenchmarkTCPPersistent              223464       227628   +1.86%
BenchmarkTCPPersistentTimeout       234494       238321   +1.63%

R=rsc, dvyukov, mikioh.mikioh, alex.brainman, bradfitz
CC=golang-dev, remyoudompheng
https://golang.org/cl/6866050

R=dave, mikioh.mikioh
CC=golang-dev
https://golang.org/cl/6873046

Fixes #4281

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/6872053