This slightly simplified the code. I stumbled upon this when support was
being added to Fuchsia (and this pattern was initially cargo-culted).

Change-Id: Ica090a118a0056c5c1b51697691bc7308f0d424a
Reviewed-on: https://go-review.googlesource.com/c/go/+/177878Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Add support for assembling integer computational instructions.

Based on the riscv-go port.

Updates #27532

Change-Id: Ibf02649eebd65ce96002a9ca0624266d96def2cd
Reviewed-on: https://go-review.googlesource.com/c/go/+/195079
Run-TryBot: Joel Sing <joel@sing.id.au>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>

This eliminates an old TODO.

Change-Id: I36d666905f43252f5d338b11ef9c1ed8b5f22b1f
Reviewed-on: https://go-review.googlesource.com/c/go/+/195817
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

There are a lot of complexities to handling switches efficiently:

1. Order matters for expression switches with non-constant cases and
for type expressions with interface types. We have to respect
side-effects, and we also can't allow later cases to accidentally take
precedence over earlier cases.

2. For runs of integers, floats, and string constants in expression
switches or runs of concrete types in type switches, we want to emit
efficient binary searches.

3. For runs of consecutive integers in expression switches, we want to
collapse them into range comparisons.

4. For binary searches of strings, we want to compare by length first,
because that's more efficient and we don't need to respect any
particular ordering.

5. For "switch true { ... }" and "switch false { ... }", we want to
optimize "case x:" as simply "if x" or "if !x", respectively, unless x
is interface-typed.

The current swt.go code reflects how these constraints have been
incrementally added over time, with each of them being handled ad
hocly in different parts of the code. Also, the existing code tries
very hard to reuse logic between expression and type switches, even
though the similarities are very superficial.

This CL rewrites switch handling to better abstract away the logic
involved in constructing the binary searches. In particular, it's
intended to make further optimizations to switch dispatch much easier.

It also eliminates the need for both OXCASE and OCASE ops, and a
subsequent CL can collapse the two.

Passes toolstash-check.

Change-Id: Ifcd1e56f81f858117a412971d82e98abe7c4481f
Reviewed-on: https://go-review.googlesource.com/c/go/+/194660
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>

This CL expands the test for #29612 to check that type switches also
work correctly when type hashes collide.

Change-Id: Ia153743e6ea0736c1a33191acfe4d8ba890be527
Reviewed-on: https://go-review.googlesource.com/c/go/+/195782
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Unmarshaling a string into a json.Number should first check that the string is a valid Number.
If not, we should fail without decoding it.

Fixes #14702

Change-Id: I286178e93df74ad63c0a852c3f3489577072cf47
GitHub-Last-Rev: fe69bb68eed06d056639f440d2daf4bb7c99013b
GitHub-Pull-Request: golang/go#34272
Reviewed-on: https://go-review.googlesource.com/c/go/+/195045Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>

We use go/format on the final output, so don't bother with the added
tabwriter work to align comments when using go/printer.

	name     old time/op         new time/op         delta
	Rulegen          2.53s ± 2%          2.48s ± 1%  -2.20%  (p=0.032 n=5+5)

	name     old user-time/op    new user-time/op    delta
	Rulegen          11.2s ± 1%          10.8s ± 0%  -3.72%  (p=0.008 n=5+5)

	name     old sys-time/op     new sys-time/op     delta
	Rulegen          218ms ±17%          207ms ±19%    ~     (p=0.548 n=5+5)

	name     old peak-RSS-bytes  new peak-RSS-bytes  delta
	Rulegen          184MB ± 3%          175MB ± 4%    ~     (p=0.056 n=5+5)

Change-Id: I53bad2ab15cace67415f2171fffcd13ed596e62b
Reviewed-on: https://go-review.googlesource.com/c/go/+/195219
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

rulegen has a sanity check that ensures all the arch-specific opcodes
are handled by each of the gen files.

This is an expensive chunk of work, particularly since there are a lot
of opcodes in total, and each one of them compiles and runs a regular
expression.

Parallelize that for each architecture, which greatly speeds up 'go run
*.go' on my laptop with four real CPU cores.

	name     old time/op         new time/op         delta
	Rulegen          3.39s ± 1%          2.53s ± 2%  -25.34%  (p=0.008 n=5+5)

	name     old user-time/op    new user-time/op    delta
	Rulegen          10.6s ± 1%          11.2s ± 1%   +6.09%  (p=0.008 n=5+5)

	name     old sys-time/op     new sys-time/op     delta
	Rulegen          201ms ± 7%          218ms ±17%     ~     (p=0.548 n=5+5)

	name     old peak-RSS-bytes  new peak-RSS-bytes  delta
	Rulegen          182MB ± 3%          184MB ± 3%     ~     (p=0.690 n=5+5)

Change-Id: Iec538ed0fa7eb867eeeeaab3da1e2615ce32cbb9
Reviewed-on: https://go-review.googlesource.com/c/go/+/195218
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>

Fixes #34321

Change-Id: Ia6253038c525089e20a1da64a2c5c9dcc57edd74
Reviewed-on: https://go-review.googlesource.com/c/go/+/195677
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>

Support for overlapping interfaces is a new (proposed) Go language
feature to be supported in Go 1.14, so it shouldn't be supported under
-lang=go1.13 or earlier.

Fixes #34329.

Change-Id: I5fea5716b7d135476980bc40b4f6e8c611b67735
Reviewed-on: https://go-review.googlesource.com/c/go/+/195678
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>

This reverts CL 192101.

Reason for revert: The same paragraph was added 2 weeks ago
(look a few lines above)

Change-Id: I05efb2631d7b4966f66493f178f2a649c715a3cc
Reviewed-on: https://go-review.googlesource.com/c/go/+/195637Reviewed-by: Cherry Zhang <cherryyz@google.com>

The '-trimpath' flag tells 'go build' to trim any paths from the
output files that are tied to the current workspace or toolchain. When
this flag is set, we do not need to include the package directory in
the text hashed to construct the action ID for each package.

Fixes #33772

Change-Id: I20b902d2f58019709b15864ca79aa0d9255ae707
Reviewed-on: https://go-review.googlesource.com/c/go/+/195318
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>

This information is redundant with the position information already
provided. Also, no other -m diagnostics print out function name.

While here, report parameter leak diagnostics against the parameter
declaration position rather than the function, and use Warnl for
"moved to heap" messages.

Test cases updated programmatically by removing the first word from
every "no match for" error emitted by run.go:

go run run.go |& \
  sed -E -n 's/^(.*):(.*): no match for `([^ ]* (.*))` in:$/\1!\2!\3!\4/p' | \
  while IFS='!' read -r fn line before after; do
    before=$(echo "$before" | sed 's/[.[\*^$()+?{|]/\\&/g')
    after=$(echo "$after" | sed -E 's/(\&|\\)/\\&/g')
    fn=$(find . -name "${fn}" | head -1)
    sed -i -E -e "${line}s/\"${before}\"/\"${after}\"/" "${fn}"
  done

Passes toolstash-check.

Change-Id: I6e02486b1409e4a8dbb2b9b816d22095835426b5
Reviewed-on: https://go-review.googlesource.com/c/go/+/195040
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>

Try to deflake TestNohup.

The kernel will deliver a signal as a thread returns from a syscall.
If the only active thread is sleeping, and the system is busy,
the kernel may not get around to waking up a thread to catch the signal.
Try splitting up the sleep, to give the kernel another change to deliver.

I don't know if this will help, but it seems worth a try.

Fixes #33174

Change-Id: I34b3240af706501ab8538cb25c4846d1d30d7691
Reviewed-on: https://go-review.googlesource.com/c/go/+/194879Reviewed-by: Bryan C. Mills <bcmills@google.com>

Zeroing unused registers is not required. Removing it makes the code
very slightly smaller and very slightly faster.

Change-Id: I1ec17b497db971ca8a3641e3e94c063571419f27
GitHub-Last-Rev: f721bb263637717e8ff9fd2c34148b5b2762e8c4
GitHub-Pull-Request: golang/go#31596
Reviewed-on: https://go-review.googlesource.com/c/go/+/173160Reviewed-by: Ian Lance Taylor <iant@golang.org>

Update the section in asm.html related to PPC64. Remove the line
that says it is in an experimental state, add a link to the
new doc.go file that has all the detail for the Go assembler for
PPC64.

Change-Id: I45d9891669e01d94e2721be576d572e02cd9d2db
Reviewed-on: https://go-review.googlesource.com/c/go/+/183840
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
Reviewed-by: Carlos Eduardo Seo <cseo@linux.vnet.ibm.com>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Add quotes when marshaling a json.Number with the string option
set via a struct tag. This ensures that the resulting json
can be unmarshaled into the source struct without error.

Fixes #34268

Change-Id: Ide167d9dec77019554870b5957b37dc258119d81
GitHub-Last-Rev: dde81b71208be01c253bb87dbb6f81ac6e0785be
GitHub-Pull-Request: golang/go#34269
Reviewed-on: https://go-review.googlesource.com/c/go/+/195043Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>

It is useful to know about the -all_codegen option for running
codegen tests for all platforms. I was puzzling that some codegen
test was not failing on my local machine or on trybot, until I
found this option.

Change-Id: I062cf4d73f6a6c9ebc2258195779d2dab21bc36d
Reviewed-on: https://go-review.googlesource.com/c/go/+/192101Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Passes toolstash-check.

Change-Id: Ieaef20b7649787727b69469f93ffc942022bc079
Reviewed-on: https://go-review.googlesource.com/c/go/+/195198
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>

The wasm_exec.js wrapper tries to set up the argv and envp following
the UNIX conventions, but doesn't get it quite right, which can cause
runtime.goenv to crash if you get unlucky.

The main problem was that the envp array wasn't terminated with a nil
pointer, so the runtime didn't know when to stop reading the array.
This CL adds that nil pointer to the end of the envp array.

The other problem was harmless, but confusing. In the UNIX convention,
the argv array consists of argc pointers followed by a nil pointer,
followed by the envp array. However, wasm_exec.js put the environment
variable count between the two pointer arrays rather than a nil
pointer. The runtime never looks at this slot, so it didn't matter,
but the break from convention left Cherry and I trying to debug why it
*wasn't* losing any environment variables before we realized that that
layouts happened to be close enough to work. This CL switches to the
UNIX convention of simply terminating the argv array with a nil
pointer.

Change-Id: Ic9a4cd9eabb5dfa599a809b960f9e579b9f1f4db
Reviewed-on: https://go-review.googlesource.com/c/go/+/193417
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Richard Musiol <neelance@gmail.com>

This CL fixes a bug in ParseExprFrom which makes
error messages ignored when there are 10+ errors
in a single expression.

fixes #34241
fixes #34274

Change-Id: I29a82d3e3e726279005eb6fbcd7ee3aebffaa679
Reviewed-on: https://go-review.googlesource.com/c/go/+/194638
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>

This follows on from https://go-review.googlesource.com/c/go/+/191358
which was submitted as a comment-only change.

Benchmarks don't show any significant change:

compress/lzw
name            old speed      new speed      delta
Decoder/1e4-56  92.8MB/s ± 1%  92.7MB/s ± 1%   ~     (p=1.000 n=5+5)
Decoder/1e5-56   100MB/s ± 1%   100MB/s ± 1%   ~     (p=0.746 n=5+5)
Decoder/1e6-56   101MB/s ± 1%   101MB/s ± 1%   ~     (p=0.381 n=5+5)

image/gif
name                old speed      new speed      delta
Decode-56           63.2MB/s ± 1%  63.2MB/s ± 1%   ~     (p=0.690 n=5+5)

Change-Id: Ic36b5410cb06ca258da32e40da1f1ff6c44cff86
Reviewed-on: https://go-review.googlesource.com/c/go/+/194938Reviewed-by: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

The Lmsgprefix flag moves the logger's prefix from the
beginning of the line to after the log header. For example,
a logger with the prefix "LOG " and LstdFlags would output:

    LOG 2009/11/10 23:00:00 entry text

Adding the Lmsgprefix flag would output:

    2009/11/10 23:00:00 LOG entry text

Fixes #32062

Change-Id: I9f7c9739abeb53c424112aaeed33444eeefdfbbc
Reviewed-on: https://go-review.googlesource.com/c/go/+/186182
Run-TryBot: Rob Pike <r@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rob Pike <r@golang.org>

If a generated test main package transitively depends on a main
package, the main package will now always be rebuilt as a library and
will not be compiled with '-p main'.

This expands the fix for #30907, which only applied to packages with
the BuildInfo set (main packages built in module mode). Linking
multiple packages with BuildInfo caused link errors, but it appears
these errors apply to some symbols in GOPATH mode.

Fixes #34114

Change-Id: Ic1e53437942269a950dd7e45d163707922c92edd
Reviewed-on: https://go-review.googlesource.com/c/go/+/195279
Run-TryBot: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Simplify determineLinkMode by calling mustLinkExternal upfront,
then doing a first pass for LinkModeAuto, followed by a second pass
that determines if the link mode is valid.

Change-Id: I9d7668107c159f8fe330b8c05fee035bbe9875fd
Reviewed-on: https://go-review.googlesource.com/c/go/+/195078Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

This change adds an intrinsic for Mul64 on s390x. To achieve that,
a new assembly instruction, MLGR, is introduced in s390x/asmz.go. This assembly
instruction directly uses an existing instruction on Z and supports multiplication
of two 64 bit unsigned integer and stores the result in two separate registers.

In this case, we require the multiplcand to be stored in register R3 and
the output result (the high and low 64 bit of the product) to be stored in
R2 and R3 respectively.

A test case is also added.

Benchmark:
name      old time/op  new time/op  delta
Mul-18    11.1ns ± 0%   1.4ns ± 0%  -87.39%  (p=0.002 n=8+10)
Mul32-18  2.07ns ± 0%  2.07ns ± 0%     ~     (all equal)
Mul64-18  11.1ns ± 1%   1.4ns ± 0%  -87.42%  (p=0.000 n=10+10)

Change-Id: Ieca6ad1f61fff9a48a31d50bbd3f3c6d9e6675c1
Reviewed-on: https://go-review.googlesource.com/c/go/+/194572Reviewed-by: Michael Munday <mike.munday@ibm.com>
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

This reverts CL 194381

Reason for revert: break tests like add2line.

Change-Id: I9e858c7ada340a842bd0cad719616ad30fae4aaa
Reviewed-on: https://go-review.googlesource.com/c/go/+/195137Reviewed-by: Matthew Dempsky <mdempsky@google.com>

Provide the initial framework for the riscv64 assembler. For now this
only supports raw WORD instructions, but at least allows for basic
testing. Additional functionality will be added in separate changes.

Based on the riscv-go port.

Updates #27532

Change-Id: I181ffb2d37a34764a3e91eded177d13a89c69f9a
Reviewed-on: https://go-review.googlesource.com/c/go/+/194117Reviewed-by: Cherry Zhang <cherryyz@google.com>

Updates #32789

Change-Id: Ie5e8e3b7b6a923aa9068c8af3ac8f081bd92c830
Reviewed-on: https://go-review.googlesource.com/c/go/+/190838Reviewed-by: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Fixes #33808

Change-Id: If1f30bc80004093ffdf9121768464dfb3a6e1f63
Reviewed-on: https://go-review.googlesource.com/c/go/+/194381
Run-TryBot: Jeremy Faller <jeremy@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>

Since the cache has been required since Go 1.12, also remove redundant
checks for a nil cache.

Updates #29127
Updates #29667

Change-Id: Ibc59b659306a4eef2d4f0e3d0b651986d6cf84ad
Reviewed-on: https://go-review.googlesource.com/c/go/+/188021
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>

No changes in compilebench, pass toolstash-check.

Change-Id: I2688f7b45af0eaa0cf3b38e726bce6e68c20f69c
Reviewed-on: https://go-review.googlesource.com/c/go/+/195077
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>

This skeleton follows the model of CL 174521,
with additions from 'relnote -html'.

Updates #33738
Updates #30439

Change-Id: I0f88ff7f231b7728dca0695143f2f2eda74d60c4
Reviewed-on: https://go-review.googlesource.com/c/go/+/195058
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Andrew Bonventre <andybons@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

This change updates the status of gccgo 8 and gccgo 9, which are now
released.

It also replaces every instance of two-spaces with one space in text
paragraphs, which is the preferred style in Go documentation.

Fixes #34167

Change-Id: I94a4d85c06281f2623d39a68db7b6c95b5867999
Reviewed-on: https://go-review.googlesource.com/c/go/+/193842Reviewed-by: Ian Lance Taylor <iant@golang.org>

TestWriteFileModeAppliesUmask and TestVectoredHandlerDontCrashOnLibrary
could both leak /tmp/go-build-* directories which isn't very friendly.

Change-Id: Ibee9c33d49ad48958fae4df73853b82d92314bf0
GitHub-Last-Rev: 814e2fa4bb4e4fe9c00b6d465313ce35c7ab4e32
GitHub-Pull-Request: golang/go#34253
Reviewed-on: https://go-review.googlesource.com/c/go/+/194880
Run-TryBot: Agniva De Sarker <agniva.quicksilver@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Originally, we default to use load and store instruction with 20 bit displacement.
However, that is not necessary. Some instructions have a displacement smaller
than 12 bit. This CL allows the usage of 12 bit load and store instruction when
that happens.

This change also reduces the size of .text section in go binary by 19 KB.

Some tests are also added to verify the functionality of the change.

Change-Id: I13edea06ca653d4b9ffeaefe8d010bc2f065c2ba
Reviewed-on: https://go-review.googlesource.com/c/go/+/194857Reviewed-by: Michael Munday <mike.munday@ibm.com>
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Jay suggested this in CL 189780, and it seems semantically correct.

As far as I can tell this has no impact one way or the other right
now, but might prevent confusion (or at least give us more experience
with error handling!) in future changes.

Updates #30748
Updates #28459
Updates #30322

Change-Id: I5d7e9a08ea141628ed6a8fd03c62d0d3c2edf2bb
Reviewed-on: https://go-review.googlesource.com/c/go/+/194817
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>

For the server response to be displayed, the response must be served
as type text/plain with charset us-ascii or utf-8, and must consist of
only graphic characters and whitespace.

We truncate the server response at the first blank line or after 8
lines or a fixed number of characters, and tab-indent (if multiple
lines) to ensure that the response is offset from ordinary go command
output.

Fixes #30748

Change-Id: I0bc1d734737e456e3251aee2252463b6355e8c97
Reviewed-on: https://go-review.googlesource.com/c/go/+/189783
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>

Updates #30748

Change-Id: I38a6cdc9c9b488fec579e6362a4284e26e0f526e
Reviewed-on: https://go-review.googlesource.com/c/go/+/189782
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>

VersionError wraps the given error in a ModuleError struct.

If the given error is already a ModuleError for the same path and
version, we now return it directly instead of wrapping.
This makes it safer to call VersionError if we don't know whether
a given error is already wrapped.

Updates #30748

Change-Id: I41b23f6c3ead0ec382e848696da51f478da1ad35
Reviewed-on: https://go-review.googlesource.com/c/go/+/189781
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>