Add support for scanning decimal types into values. If the dest
supports the decimal composer interface and the src supports
the decimal decomposer, set the value of the decimal when Scanning.

Add support for sending decimal decomposer interface values
as parameters.

For #30870

Change-Id: Ic5dbf9069df8d56405852b17542a9188d55c2947
Reviewed-on: https://go-review.googlesource.com/c/go/+/174181
Run-TryBot: Daniel Theophanes <kardianos@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Exposing the underlying driver conn will allow the use of the
standard connection pool while still able to run special function
directly on the driver.

Fixes #29835

Change-Id: Ib6d3b9535e730f008916805ae3bf76e4494c88f9
Reviewed-on: https://go-review.googlesource.com/c/go/+/174182
Run-TryBot: Daniel Theophanes <kardianos@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Factor the try-on-failure variants are now in the package
cmd/go/internal/robustio.

Add to them a RemoveAll variant using the same retry loop,
and use it to attempt to address the observed flakes in
TestLinkXImportPathEscape.

Fixes #19491
Updates #25965
Updates #28387
Updates #32188

Change-Id: I9db1a0c7537b8aaadccab1b9eca734595668ba29
Reviewed-on: https://go-review.googlesource.com/c/go/+/181541
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Russ Cox <rsc@golang.org>

Also, in 'go get' in GOPATH mode, report an error for package paths
that start with '-'.

Change-Id: Ic2575381aa2d093ba15c53b893bf2eaded8b6066
Reviewed-on: https://go-review.googlesource.com/c/go/+/181237
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>

Change-Id: I71a6816f54f8ad0f8531bb3f9de552fd136a0ed4
Reviewed-on: https://go-review.googlesource.com/c/go/+/181943Reviewed-by: Ian Lance Taylor <iant@golang.org>

Change-Id: Ifdc3c5b840e6833f14c8e52948e45d5faa5a0615
Reviewed-on: https://go-review.googlesource.com/c/go/+/181940Reviewed-by: Ian Lance Taylor <iant@golang.org>

While it is possible for the connection pool to guard against panics
on every valuer read, this seems like a high cost to be added,
in both code complexity and possible runtime performance.

Most uses of the Valuer will be trivial, like returning
a struct field. Optimize for that case. If sometime may panic the
valuer should itself use recover and return an error.

Fixes #26332

Change-Id: Iad18780b8028f669f5a7841b74a5384d62fb6a7e
Reviewed-on: https://go-review.googlesource.com/c/go/+/170700Reviewed-by: Ian Lance Taylor <iant@golang.org>

This change makes the release notes for Go 1.13 more complete
by mentioning a new function in the os package.

Change-Id: I0d637fd70ff6d14782bbfb7c13985a0f83b19d6d
Reviewed-on: https://go-review.googlesource.com/c/go/+/181945Reviewed-by: Ian Lance Taylor <iant@golang.org>

Change-Id: Ib5417cc48959b03befb1579da3281415a11ede9f
Reviewed-on: https://go-review.googlesource.com/c/go/+/181879Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>

It is too confusing to have to set GONOSUMDB and GONOPROXY
in common use cases, but one cannot be guaranteed to be a
subset of the other.

This CL adds GOPRIVATE, which takes the same kind of pattern list
but is defined as "these patterns are private (non-public) modules".
Today the implication is that GOPRIVATE is the default setting for
GONOSUMDB and GONOPROXY. If there are other accommodations
to make for private packages in the future or in other tools,
having this clear statement of intent will let us do that.
(For example maybe an IDE integration would hyperlink an import
path to godoc.org; consulting GOPRIVATE would be a reasonable
way to decide not to do that for certain imports. In contrast,
consulting GONOPROXY or GONOSUMDB clearly would not.)

Fixes #32184.

Change-Id: If54c12d353c7a0a5c0e0273764140cce3c154a02
Reviewed-on: https://go-review.googlesource.com/c/go/+/181719
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

For int8, int16, and int32, comparing their unsigned value to MaxInt64
to determine non-negativity doesn't make sense, because they have
negative values whose unsigned representation is smaller than that.
Fix is simply to compare with the appropriate upper bound based on the
value type's size.

Fixes #32560.

Change-Id: Ie7afad7a56af92bd890ba5ff33c86d1df06cfd9a
Reviewed-on: https://go-review.googlesource.com/c/go/+/181797
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Change-Id: I032a3342c3ac899a39d357420b981b6f281518f6
Reviewed-on: https://go-review.googlesource.com/c/go/+/181939Reviewed-by: Daniel Theophanes <kardianos@gmail.com>

Change-Id: I49b09349a632a6b6219c85638d9cb6774c0c210a
Reviewed-on: https://go-review.googlesource.com/c/go/+/181721Reviewed-by: Bryan C. Mills <bcmills@google.com>

Change-Id: Idb5bf2a61bff635e3ebd926bdeacf943578ac874
Reviewed-on: https://go-review.googlesource.com/c/go/+/181681Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>

Make "go test" run the new errorsas vet check by default.

Fixes #31213.

Change-Id: I5c93c000874ffe1c0b6d647bf10de803f414c5c1
Reviewed-on: https://go-review.googlesource.com/c/go/+/179977
Run-TryBot: Jonathan Amsterdam <jba@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Matloob <matloob@golang.org>

Change-Id: I389d140e8fd2849e4dc438246add47819f6b25a3
Reviewed-on: https://go-review.googlesource.com/c/go/+/181300Reviewed-by: Bryan C. Mills <bcmills@google.com>

Fixes #32191

Change-Id: I6eebe1d4975e904c906e6b839cd6cab9447cbb34
Reviewed-on: https://go-review.googlesource.com/c/go/+/181019
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>

Change-Id: I4923f0726ae0261a7c7b0f85e7433ae0f605c123
Reviewed-on: https://go-review.googlesource.com/c/go/+/181738Reviewed-by: Bryan C. Mills <bcmills@google.com>

This change revendors golang.org/x/tools to include the check and
modifies cmd/vet to add it to the command.

CL 179977 will enable the check by default for 'go test'.

Commands run (starting in GOROOT/src):
	cd cmd
	emacs vet/main.go
	go get -u=patch golang.org/x/tools/go/analysis/passes/errorsas@latest
	go mod tidy
	go mod vendor
	cd ..
	./make.bash
	go test all

Updates #31213

Change-Id: Ic2ba9bd2d31c4c5fd9e7c42ca14e8dc38520c93b
Reviewed-on: https://go-review.googlesource.com/c/go/+/181717Reviewed-by: Jonathan Amsterdam <jba@google.com>

Check the value of target after As returns true.

Change-Id: I76a2b25fe825ee1dbb5f39f8f0b211c55bd25a4f
Reviewed-on: https://go-review.googlesource.com/c/go/+/181299Reviewed-by: Bryan C. Mills <bcmills@google.com>

Change-Id: I34fd45ee252474c12f2e9c8d9b1a75b9eabb57f2
Reviewed-on: https://go-review.googlesource.com/c/go/+/181549Reviewed-by: Bryan C. Mills <bcmills@google.com>

Change-Id: I8ae00d2392c20c627d58cf7e79015e982b971802
Reviewed-on: https://go-review.googlesource.com/c/go/+/181551Reviewed-by: Filippo Valsorda <filippo@golang.org>

Change-Id: I1c3e3305dfee4545a6caedd48243770ab3b28277
Reviewed-on: https://go-review.googlesource.com/c/go/+/181550Reviewed-by: Filippo Valsorda <filippo@golang.org>

$GOEXE exists and is documented in 'go env', so $exe is redundant and
a bit confusing. Notably, mod_modinfo.txt already assumes that GOEXE
is set (even though it isn't), and thus fails on Windows.

After this CL, `go test cmd/go/...` passes on a windows-amd64-2016
builder. However, given that the $PATH on the builder is very minimal
(#32430) and network access is limited, tests that rely on binaries
(such as 'git') or external networking may still be broken.

Updates #25300

Change-Id: I9d80f2a0fbaa8bc35fa2205b6898aeccecda4e94
Reviewed-on: https://go-review.googlesource.com/c/go/+/181542
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Change-Id: I684e3522e387b2d96d5cfb2878d2f77bf4558443
Reviewed-on: https://go-review.googlesource.com/c/go/+/181545Reviewed-by: Bryan C. Mills <bcmills@google.com>

No references to this function remain; remove it to avoid confusion
and reduce build overhead.

The last reference was removed in CL 167748.

Change-Id: I9d023c5d8904800edd3898fed79aa9f824dfb46a
Reviewed-on: https://go-review.googlesource.com/c/go/+/181548Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>

64 bits is 8 bytes. Duh.

Change-Id: I991b359df6241889bdef13152f551af9db6e14c9
Reviewed-on: https://go-review.googlesource.com/c/go/+/181557
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>

Add a helper-function to testenv to make these skips more ergonomic.
Also update a few existing skips in cmd/go/... to use it.

Updates #25300

Change-Id: I4205b4fb2b685dfac1cff3c999f954bff7b0f3c1
Reviewed-on: https://go-review.googlesource.com/c/go/+/181538Reviewed-by: Ian Lance Taylor <iant@golang.org>

This reverts CL 180761

Reason for revert: Reinstate the stack-allocated defer CL.

There was nothing wrong with the CL proper, but stack allocation of defers exposed two other issues.

Issue #32477: Fix has been submitted as CL 181258.
Issue #32498: Possible fix is CL 181377 (not submitted yet).

Change-Id: I32b3365d5026600069291b068bbba6cb15295eb3
Reviewed-on: https://go-review.googlesource.com/c/go/+/181378Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

On freebsd 12, the system call for getdirentries writes 64 bits to
*basep, even on 32-bit systems. Accomodate that by providing a uint64
to the system call and copy the base to/from that uint64.
The uint64 seems to be a virtual file offset, so failing if the high
bits are not zero should be fine for reasonable-sized directories.

Fixes #32498

Change-Id: Ie22c0d301c6091bd20e813432928b24ab95cc314
Reviewed-on: https://go-review.googlesource.com/c/go/+/181377
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Fixes #27698
Fixes #32227

Change-Id: I2416408b3de2f9f1ae1af2911cc327a65d2c0170
Reviewed-on: https://go-review.googlesource.com/c/go/+/181037Reviewed-by: Jay Conrod <jayconrod@google.com>

This is a followup to CL 181278 and CL 181177.

According to cmd/go/testdata/script/README:

	Each line is parsed into a sequence of space-separated command words,
	with environment variable expansion and # marking an end-of-line comment.
	Adding single quotes around text keeps spaces in that text from being treated
	as word separators and also disables environment variable expansion.

We want $HOME to be expanded, so leave it out of the single-quoted
block of text.

I tested this change on macOS, and it makes TestScript/env_write pass.

Fixes #32503

Change-Id: I13621aec82263e5cb6978c13a1ad71d2210a0e42
Reviewed-on: https://go-review.googlesource.com/c/go/+/181418
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>

I didn't realise that the trybots don't include any Mac machines, so I
assumed this test change was fine when submitting CL 181177.

In any case, this is a simple fix. I forgot to add the quotes, as the
new UserConfigDir on Mac includes a space.

Change-Id: I0766b966fc41736e9fc859e37f059a3f12788d7a
Reviewed-on: https://go-review.googlesource.com/c/go/+/181278
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

The old code used ~/Library/Preferences, which is documented by
Apple as:

	This directory contains app-specific preference files. You
	should not create files in this directory yourself. Instead, use
	the NSUserDefaults class or CFPreferences API to get and set
	preference values for your app.

It looks like we missed everything after the first sentence; it's
definitely not the right choice for files that Go programs and users
should be touching directly.

Instead, use ~/Library/Application Support, which is documented as:

	Use this directory to store all app data files except those
	associated with the user’s documents. For example, you might use
	this directory to store app-created data files, configuration
	files, templates, or other fixed or modifiable resources that
	are managed by the app. An app might use this directory to store
	a modifiable copy of resources contained initially in the app’s
	bundle. A game might use this directory to store new levels
	purchased by the user and downloaded from a server.

This seems in line with what UserConfigDir is for, so use it.

The documentation quotes above are obtained from the surprisingly long
link below:

https://developer.apple.com/library/archive/documentation/FileManagement/Conceptual/FileSystemProgrammingGuide/FileSystemOverview/FileSystemOverview.html

Fixes #32475.

Change-Id: Ic27a6c92d76a5d7a4d4b8eac5cd8472f67a533a4
Reviewed-on: https://go-review.googlesource.com/c/go/+/181177
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Andrew Bonventre <andybons@golang.org>

The logic for detecting deferreturn calls is wrong.

We used to look for a relocation whose symbol is runtime.deferreturn
and has an offset of 0. But on some architectures, the relocation
offset is not zero. These include arm (the offset is 0xebfffffe) and
s390x (the offset is 6).

This ends up setting the deferreturn offset at 0, so we end up using
the entry point live map instead of the deferreturn live map in a
frame which defers and then segfaults.

Instead, use the IsDirectCall helper to find calls.

Fixes #32477
Update #6980

Change-Id: Iecb530a7cf6eabd7233be7d0731ffa78873f3a54
Reviewed-on: https://go-review.googlesource.com/c/go/+/181258
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>

This is the net/http half of #32476. This supplies the method needed
by the other half in x/net/http2 in the already-submitted CL 181259,
which this CL also bundles in h2_bundle.go.

Thanks to Tom Thorogood (@tmthrgd) for the bug report and test.

Fixes #32476
Updates #30694

Change-Id: I79d2a280e486fbf75d116f6695fd3abb61278765
Reviewed-on: https://go-review.googlesource.com/c/go/+/181260
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

dist passes the -allabis flag to the compiler to avoid having to
recreate the cross-package ABI logic from cmd/go. However, we removed
that logic from cmd/go in CL 179863 and replaced it with a different
mechanism that doesn't depend on the build system. Hence, passing
-allabis in dist is no longer necessary.

This CL removes -allabis from dist and, since that was the only use of
it, removes support for it from the compiler as well.

Updates #31230.

Change-Id: Ib005db95755a7028f49c885785e72c3970aea4f9
Reviewed-on: https://go-review.googlesource.com/c/go/+/181079
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>

The documentation comment was duplicated for each of these methods, and
the LazyProc.Call documentation incorrectly mentioned that Call accepts
only 15 arguments, but it actually accepts 18 now.

To prevent further documentation drift, refer the reader to the
documentation for Proc.Call instead of duplicating it for LazyProc.Call.

In addition, note that LazyProc's Addr, Call, and Find methods each
trigger a procedure lookup.

Change-Id: I6756cf7601fba79d1414ff5a5d6eef900aa590e7
Reviewed-on: https://go-review.googlesource.com/c/go/+/181199
Run-TryBot: Matt Layher <mdlayher@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Checks if modules are enabled in GOPATH mode.
Error message returned when no version is provided. Relevant tests
updated. Test for GO111MODULE=off added.

Fixes #27783

Change-Id: I12cdaced5fa38a9c49c0ecfed4c479eb86ed061f
Reviewed-on: https://go-review.googlesource.com/c/go/+/179998
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>

In #32038, it was decided to remove get's -m, since one former use case
is removed, and the other can be done via -d, as pointed by Russ.

However, a user getting this short error might not realise that they can
switch to -d to skip building packages. Add a short mention to point
them in the right direction.

It's important to note "packages", because -m was a flag that acted on
modules, while -d acts on packages. Simply replacing -m with -d might
not be enough in some cases because of that distinction.

Change-Id: I0947b25c4223bdad3cd0e535848527da8db8a16d
Reviewed-on: https://go-review.googlesource.com/c/go/+/179361Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>