Fixes#35492
Change-Id: I00dce8fd1228f809e0c61013ac4de7a5953cbbf9
Reviewed-on: https://go-review.googlesource.com/c/go/+/206997
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
'go build' now reports a more useful error when a relative path on the
command line points to a directory that doesn't exist or a directory
without .go files. Errors are generated by go/build.Context.ImportDir
instead of a vague call to base.Fatalf in modload.
Fixes#35414
Change-Id: I2642230c5e409107b98bb6d6c3a484d8d25b4147
Reviewed-on: https://go-review.googlesource.com/c/go/+/206902
Run-TryBot: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
It turns out that there is a path that initializes netpoll and opens
file descriptors before running the os/exec init function: on some
systems, the uses of NewFile when setting os.Stdin and friends can
initialize netpoll which can open file descriptors. This in itself
is not a problem, but when we check whether the new files are open
using os.NewFile, a side-effect is to put them into non-blocking mode.
This can then break future uses of netpoll.
Updates #35469Fixes#35566
Change-Id: I1b2e2c943695d1c2d29496b050abbce9ee710a00
Reviewed-on: https://go-review.googlesource.com/c/go/+/207078
Reviewed-by: Bryan C. Mills <bcmills@google.com>
The bash version of the test wrote intermediate files to its testdata directory.
Updates #28387
Updates #30316Fixes#35536
Change-Id: Ib81b547d3c43e90df713a2172c8f399fefb53c68
Reviewed-on: https://go-review.googlesource.com/c/go/+/206901
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
The bounds in the last carry branch were wrong as there
is no reason for len(u) >= n+n/2 to always hold true.
We also adjust test to avoid using a remainder of 1
(in which case, the last step of the algorithm computes
(qhatv+1) - qhatv which rarely produces a carry).
Change-Id: I69fbab9c5e19d0db1c087fbfcd5b89352c2d26fb
Reviewed-on: https://go-review.googlesource.com/c/go/+/206839
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
In the discussion of CL 171828 we decided that it was not necessary to
acquire timersLock around the call to moveTimers, because the world is
stopped. However, that is not correct, as sysmon runs even when the world
is stopped, and it calls timeSleepUntil which looks through the timers.
timeSleepUntil acquires timersLock, but that doesn't help if moveTimers
is running at the same time.
Updates #6239
Updates #27707
Updates #35462
Change-Id: I346c5bde594c4aff9955ae430b37c2b6fc71567f
Reviewed-on: https://go-review.googlesource.com/c/go/+/206938
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Test fix: in dwarf_test.go don't try to run the TestDWARF testpoint on
windows with c-archive build mode (linker + debug/pe support for that
build mode on Windows is not fully baked it seems).
Fixes#35512.
Change-Id: I1c87ff3d62e5b98e75062b184d762fb5ed937745
Reviewed-on: https://go-review.googlesource.com/c/go/+/206899
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Our attempts to close existing open files are flaky. They will fail if,
for example, file descriptor 3 is open when the test binary starts.
Instead, report any such cases, and skip TestExtraFiles.
Updates #35469
Change-Id: I7caec083f3f4a31579bf28fc9c82ae89b1bde49a
Reviewed-on: https://go-review.googlesource.com/c/go/+/206939
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
In CL 206757 I added a log.Printf to identify when GOROOT is not read-only.
However, it interacts badly with test sharding in the builders:
the log is repeated for every shard.
Since the log statement isn't particularly high-value, just remove it.
Updates #30316
Change-Id: I385a7f35da59e38ad8b9beef92dc11af931d9571
Reviewed-on: https://go-review.googlesource.com/c/go/+/206898
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Carlos Amedee <carlos@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Not a fix, but will give us more info when it flakes again.
Updates #35113
Change-Id: I2f90c24530c1bea81dd9d8c7a59f4b0640dfa4c2
Reviewed-on: https://go-review.googlesource.com/c/go/+/206819
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Provide initial linker support for riscv64.
Based on riscv-go port.
Updates #27532
Change-Id: I8a881ce41cd49efef0358bad9171d4d18aaf7ab2
Reviewed-on: https://go-review.googlesource.com/c/go/+/204624
Run-TryBot: Joel Sing <joel@sing.id.au>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
The problem should be fixed by the previous CL. Reenable async
preemption on darwin/arm64.
Updates #35439.
Change-Id: I93e8c4702b4d8fe6abaa6fc9c27def5c8aed1b59
Reviewed-on: https://go-review.googlesource.com/c/go/+/206419
Reviewed-by: Keith Randall <khr@golang.org>
iOS does not support SA_ONSTACK. The signal handler runs on the
G stack. Any writes below the SP may be clobbered by the signal
handler (even without call injection). So we save LR after
decrementing SP on iOS.
Updates #35439.
Change-Id: Ia6d7a0669e0bcf417b44c031d2e26675c1184165
Reviewed-on: https://go-review.googlesource.com/c/go/+/206418
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Some, but not all, architectures mix in OS-provided random seeds when
initializing the fastrand state. The others have TODOs saying we need
to do the same. Lift that logic up in the architecture-independent
part, and use memhash to mix the seed instead of a simple addition.
Previously, dumping the fastrand state at initialization would yield
something like the following on linux-amd64, where the values in the
first column do not change between runs (as thread IDs are sequential
and always start at 0), and the values in the second column, while
changing every run, are pretty correlated:
first run:
0x0 0x44d82f1c
0x5f356495 0x44f339de
0xbe6ac92a 0x44f91cd8
0x1da02dbf 0x44fd91bc
0x7cd59254 0x44fee8a4
0xdc0af6e9 0x4547a1e0
0x3b405b7e 0x474c76fc
0x9a75c013 0x475309dc
0xf9ab24a8 0x4bffd075
second run:
0x0 0xa63fc3eb
0x5f356495 0xa6648dc2
0xbe6ac92a 0xa66c1c59
0x1da02dbf 0xa671bce8
0x7cd59254 0xa70e8287
0xdc0af6e9 0xa7129d2e
0x3b405b7e 0xa7379e2d
0x9a75c013 0xa7e4c64c
0xf9ab24a8 0xa7ecce07
With this change, we get initial states that appear to be much more
unpredictable, both within the same run as well as between runs:
0x11bddad7 0x97241c63
0x553dacc6 0x2bcd8523
0x62c01085 0x16413d92
0x6f40e9e6 0x7a138de6
0xa4898053 0x70d816f0
0x5ca5b433 0x188a395b
0x62778ca9 0xd462c3b5
0xd6e160e4 0xac9b4bd
0xb9571d65 0x597a981d
Change-Id: Ib22c530157d74200df0083f830e0408fd4aaea58
Reviewed-on: https://go-review.googlesource.com/c/go/+/203439
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This test was failing when GOROOT was read-only.
(I'm not sure why that was the case, but it's simpler to convert to to
a script than to try to debug the non-script test.)
Updates #28387
Change-Id: I9943e28d990e5d8b01da10e70531f3ab99e319a7
Reviewed-on: https://go-review.googlesource.com/c/go/+/206897
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
There is a (theoretical, but possible) chance that the
random number values a, b used for TestDiv are 0 or 1,
in which case the test would fail.
This CL makes sure that a >= 1 and b >= 2 at all times.
Fixes#35523.
Change-Id: I6451feb94241249516a821cd0066e95a0c65b0ed
Reviewed-on: https://go-review.googlesource.com/c/go/+/206818
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This CL detects infinite loops due to negative dereference cycles
during escape analysis, and terminates the loop gracefully. We still
fail to print a complete explanation of the escape path, but esc.go
didn't print *any* explanation for these test cases, so the release
blocking issue here is simply that we don't infinite loop.
Updates #35518.
Change-Id: I39beed036e5a685706248852f1fa619af3b7abbc
Reviewed-on: https://go-review.googlesource.com/c/go/+/206619
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Also log a message and skip the Chmods if running as root.
Updates #30316
Change-Id: Ifb68d06ce845275a72d64c808407e8609df270bc
Reviewed-on: https://go-review.googlesource.com/c/go/+/206757
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
At least on Darwin notewakeup is not async-signal-safe.
Fixes#35276
Change-Id: I1d7523715e8e77dbd7f21d9b1ed131e52d46cc41
Reviewed-on: https://go-review.googlesource.com/c/go/+/206078
Reviewed-by: Austin Clements <austin@google.com>
If no writes to the package buffer happen, then the package clause
does not get printed. This is a bug for cases where a file just contains
the package clause.
We fix this by separating the printing of package clause to a new
function and calling it from (*pkgBuffer).Write as well as (*Package).flush.
Updates #31457
Change-Id: Ia3bd0ea3963274c460a45d1e37fafc6ee0a197f0
Reviewed-on: https://go-review.googlesource.com/c/go/+/206128
Run-TryBot: Agniva De Sarker <agniva.quicksilver@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
The current division algorithm produces one word of result at a time,
using 2-word division to compute the top word and mulAddVWW to compute
the remainder. The top word may need to be adjusted by 1 or 2 units.
The recursive version, based on Burnikel, Ziegler, "Fast Recursive Division",
uses the same principles, but in a multi-word setting, so that
multiplication benefits from the Karatsuba algorithm (and possibly later
improvements).
benchmark old ns/op new ns/op delta
BenchmarkDiv/20/10-4 38.2 38.3 +0.26%
BenchmarkDiv/40/20-4 38.7 38.5 -0.52%
BenchmarkDiv/100/50-4 62.5 62.6 +0.16%
BenchmarkDiv/200/100-4 238 259 +8.82%
BenchmarkDiv/400/200-4 311 338 +8.68%
BenchmarkDiv/1000/500-4 604 649 +7.45%
BenchmarkDiv/2000/1000-4 1214 1278 +5.27%
BenchmarkDiv/20000/10000-4 38279 36510 -4.62%
BenchmarkDiv/200000/100000-4 3022057 1359615 -55.01%
BenchmarkDiv/2000000/1000000-4 310827664 54012939 -82.62%
BenchmarkDiv/20000000/10000000-4 33272829421 1965401359 -94.09%
BenchmarkString/10/Base10-4 158 156 -1.27%
BenchmarkString/100/Base10-4 797 792 -0.63%
BenchmarkString/1000/Base10-4 3677 3814 +3.73%
BenchmarkString/10000/Base10-4 16633 17116 +2.90%
BenchmarkString/100000/Base10-4 5779029 1793808 -68.96%
BenchmarkString/1000000/Base10-4 889840820 85524031 -90.39%
BenchmarkString/10000000/Base10-4 134338236860 4935657026 -96.33%
Fixes#21960
Updates #30943
Change-Id: I134c6f81a47870c688ca95b6081eb9211def15a2
Reviewed-on: https://go-review.googlesource.com/c/go/+/172018
Reviewed-by: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
An error check was missing: If the first argument of a pipeline is
parenthesized, and the pipeline has further arguments, then
syntactically the pipeline is a function invocation and there must
be a "call". Tricky rare corner case, but easily caught.
Add the error check and some tests to verify behavior.
Fixes#31810.
Change-Id: Ica80b7c11284e4ea9e8cc94a01dbbc9a67e42079
Reviewed-on: https://go-review.googlesource.com/c/go/+/206124
Reviewed-by: Ian Lance Taylor <iant@golang.org>
We use the typedValue map to prevent showing typed variables
and constants from appearing in the VARIABLES/CONSTANTS section
because they will be anyways shown in the TYPES section
for that type.
However, when a type is unexported, but the variable is exported,
then unconditionally setting it to true in the map suppresses it
from being shown in the VARIABLES section. Thus, we set the
variable or constant in the typedValue map only when
the type name is exported.
Fixes#31067
Change-Id: Id3ec4b313c9ea7e3ce6fe279680d56f65451719f
Reviewed-on: https://go-review.googlesource.com/c/go/+/206129
Run-TryBot: Agniva De Sarker <agniva.quicksilver@gmail.com>
Reviewed-by: Rob Pike <r@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
The cipher suites were apparently renamed late in the standardization
process, and we picked up the legacy name. We can't remove the old
constants, but add correctly named ones.
Fixes#32061
Change-Id: I65ee25c12c10934391af88b76b18565da67453fa
Reviewed-on: https://go-review.googlesource.com/c/go/+/205068
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Adam Langley <agl@golang.org>
TLS 1.3, which requires RSA-PSS, is now enabled without a GODEBUG
opt-out, and with the introduction of
Certificate.SupportedSignatureAlgorithms (#28660) there is a
programmatic way to avoid RSA-PSS (disable TLS 1.3 with MaxVersion and
use that field to specify only PKCS#1 v1.5 SignatureSchemes).
This effectively reverts 0b3a57b537,
although following CL 205061 all of the signing-side logic is
conveniently centralized in signatureSchemesForCertificate.
Fixes#32425
Change-Id: I7c9a8893bb5d518d86eae7db82612b9b2cd257d7
Reviewed-on: https://go-review.googlesource.com/c/go/+/205063
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Katie Hockman <katie@golang.org>
Reviewed-by: Adam Langley <agl@golang.org>
This will let applications stop crypto/tls from using a certificate key
with an algorithm that is not supported by its crypto.Signer, like
hardware backed keys that can't do RSA-PSS.
Fixes#28660
Change-Id: I294cc06bddf813fff35c5107540c4a1788e1dace
Reviewed-on: https://go-review.googlesource.com/c/go/+/205062
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Adam Langley <agl@golang.org>
Now that we have a full implementation of the logic to check certificate
compatibility, we can let applications just list multiple chains in
Certificates (for example, an RSA and an ECDSA one) and choose the most
appropriate automatically.
NameToCertificate only maps each name to one chain, so simply deprecate
it, and while at it simplify its implementation by not stripping
trailing dots from the SNI (which is specified not to have any, see RFC
6066, Section 3) and by not supporting multi-level wildcards, which are
not a thing in the WebPKI (and in crypto/x509).
The performance of SupportsCertificate without Leaf is poor, but doesn't
affect current users. For now document that, and address it properly in
the next cycle. See #35504.
While cleaning up the Certificates/GetCertificate/GetConfigForClient
behavior, also support leaving Certificates/GetCertificate nil if
GetConfigForClient is set, and send unrecognized_name when there are no
available certificates.
Fixes#29139Fixes#18377
Change-Id: I26604db48806fe4d608388e55da52f34b7ca4566
Reviewed-on: https://go-review.googlesource.com/c/go/+/205059
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Katie Hockman <katie@golang.org>
Also, add Version to CertificateRequestInfo, as the semantics of
SignatureSchemes change based on version: the ECDSA SignatureSchemes are
only constrained to a specific curve in TLS 1.3.
Fixes#32426
Change-Id: I7a551bea864799e98118349ac2476162893d1ffd
Reviewed-on: https://go-review.googlesource.com/c/go/+/205058
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Adam Langley <agl@golang.org>
We'll also use this function for a better selection logic from
Config.Certificates in a later CL.
Updates #32426
Change-Id: Ie239574d02eb7fd2cf025ec36721c8c7e082d0bc
Reviewed-on: https://go-review.googlesource.com/c/go/+/205057
Reviewed-by: Katie Hockman <katie@golang.org>
This refactors a lot of the certificate support logic to make it cleaner
and reusable where possible. These changes will make the following CLs
much simpler.
In particular, the heavily overloaded pickSignatureAlgorithm is gone.
That function used to cover both signing and verifying side, would work
both for pre-signature_algorithms TLS 1.0/1.1 and TLS 1.2, and returned
sigalg, type and hash.
Now, TLS 1.0/1.1 and 1.2 are differentiated at the caller, as they have
effectively completely different logic. TLS 1.0/1.1 simply use
legacyTypeAndHashFromPublicKey as they employ a fixed hash function and
signature algorithm for each public key type. TLS 1.2 is instead routed
through selectSignatureScheme (on the signing side) or
isSupportedSignatureAlgorithm (on the verifying side) and
typeAndHashFromSignatureScheme, like TLS 1.3.
On the signing side, signatureSchemesForCertificate was already version
aware (for PKCS#1 v1.5 vs PSS support), so selectSignatureScheme just
had to learn the Section 7.4.1.4.1 defaults for a missing
signature_algorithms to replace pickSignatureAlgorithm.
On the verifying side, pickSignatureAlgorithm was also checking the
public key type, while isSupportedSignatureAlgorithm +
typeAndHashFromSignatureScheme are not, but that check was redundant
with the one in verifyHandshakeSignature.
There should be no major change in behavior so far. A few minor changes
came from the refactor: we now correctly require signature_algorithms in
TLS 1.3 when using a certificate; we won't use Ed25519 in TLS 1.2 if the
client didn't send signature_algorithms; and we don't send
ec_points_format in the ServerHello (a compatibility measure) if we are
not doing ECDHE anyway because there are no mutually supported curves.
The tests also got simpler because they test simpler functions. The
caller logic switching between TLS 1.0/1.1 and 1.2 is tested by the
transcript tests.
Updates #32426
Change-Id: Ice9dcaea78d204718f661f8d60efdb408ba41577
Reviewed-on: https://go-review.googlesource.com/c/go/+/205061
Reviewed-by: Katie Hockman <katie@golang.org>
This CL is based on work started by Joe Tsai in CL 94855.
It's rebased on top of the latest master branch, and
addresses various code review comments and findings
from attempting to use the original CL in practice.
The testing package documents a naming convention for examples
so that documentation tools can associate them with:
• a package (Example or Example_suffix)
• a function F (ExampleF or ExampleF_suffix)
• a type T (ExampleT or ExampleT_suffix)
• a method T.M (ExampleT_M or ExampleT_M_suffix)
This naming convention is in widespread use and enforced
via existing go vet checks.
This change adds first-class support for classifying examples
to go/doc, the package responsible for computing package
documentation from Go AST.
There isn't a way to supply test files to New that works well.
External test files may have a package name with "_test" suffix,
so ast.NewPackage may end up using the wrong package name if given
test files. A workaround is to add test files to *ast.Package.Files
after it is returned from ast.NewPackage:
pkg, _ := ast.NewPackage(fset, goFiles, ...)
for name, f := range testGoFiles {
pkg.Files[name] = f
}
p := doc.New(pkg, ...)
But that is not a good API.
After nearly 8 years, a new entry-point is added to the go/doc
package, the function NewFromFiles. It accepts a Go package in
the form of a list of parsed Go files (including _test.go files)
and an import path. The caller is responsible with filtering out
files based on build constraints, as was the case before with New.
NewFromFiles computes package documentation from .go files,
extracts examples from _test.go files and classifies them.
Examples fields are added to Package, Type, and Func. They are
documented to only be populated with examples found in _test.go
files provided to NewFromFiles.
The new behavior is:
1. NewFromFiles computes package documentation from provided
parsed .go files. It extracts examples from _test.go files.
2. It assigns each Example to corresponding Package, Type,
or Func.
3. It sets the Suffix field in each example to the suffix.
4. Malformed examples are skipped.
This change implements behavior that matches the current behavior
of existing godoc-like tools, and will enable them to rely on the
logic in go/doc instead of reimplementing it themselves.
Fixes#23864
Change-Id: Iae834f2ff92fbd1c93a9bb7c2bf47d619bee05cf
Reviewed-on: https://go-review.googlesource.com/c/go/+/204830
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
Disable a portion of the TestDWARF testpoint for Windows using
c-archive buildmode, pending investigation of the issue at hand, so as
to get the longtest builder unblocked.
Updates #35512.
Change-Id: Ib72d82ceaa674b9a51da220fb8e225231d5c3433
Reviewed-on: https://go-review.googlesource.com/c/go/+/206557
Run-TryBot: Than McIntosh <thanm@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
This test failed in a pending CL, and I would rather debug it as a script.
Change-Id: I231367c86415ab61d0f9e08b88c9546d32b373b7
Reviewed-on: https://go-review.googlesource.com/c/go/+/206498
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This test failed in a pending CL, and I would rather debug it as a script.
Change-Id: I0ae7486a9949bea40d5dd36afe6919f86f14dfa7
Reviewed-on: https://go-review.googlesource.com/c/go/+/206499
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This CL restores behavior before CL 189797 and fixes a misleading
comment. modload.ListModules may return info without a version for the
main module and for modules replaced with local directories.
Fixes#35505
Change-Id: I5b4e68053a680ff897b072fdf6e7aa17b6e1ac34
Reviewed-on: https://go-review.googlesource.com/c/go/+/206538
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
