Go 1.16 is not yet released. These are work-in-progress release notes. Go 1.16 is expected to be released in February 2021.
TODO
Go now supports the 64-bit ARM architecture on NetBSD (the
netbsd/arm64 port).
As announced in the Go 1.15 release notes,
Go 1.16 drops support for x87 mode compilation (GO386=387).
Support for non-SSE2 processors is now available using soft float
mode (GO386=softfloat).
Users running on non-SSE2 processors should replace GO386=387
with GO386=softfloat.
TODO
go install now accepts arguments with
version suffixes (for example, go install
example.com/cmd@v1.0.0). This causes go
install to build and install packages in module-aware mode,
ignoring the go.mod file in the current directory or any parent
directory, if there is one. This is useful for installing executables without
affecting the dependencies of the main module.
TODO: write and link to section in golang.org/ref/mod
TODO: write and link to blog post
retract directives may now be used in a go.mod file
to indicate that certain published versions of the module should not be used
by other modules. A module author may retract a version after a severe problem
is discovered or if the version was published unintentionally.
TODO: write and link to section in golang.org/ref/mod
TODO: write and link to tutorial or blog post
The go mod vendor
and go mod tidy subcommands now accept
the -e flag, which instructs them to proceed despite errors in
resolving missing packages.
go test
When using go test, a test that
calls os.Exit(0) during execution of a test function
will now be considered to fail.
This will help catch cases in which a test calls code that calls
os.Exit(0) and thereby stops running all future tests.
If a TestMain function calls os.Exit(0)
that is still considered to be a passing test.
The go get -insecure flag is
deprecated and will be removed in a future version. This flag permits
fetching from repositories and resolving custom domains using insecure
schemes such as HTTP, and also bypassess module sum validation using the
checksum database. To permit the use of insecure schemes, use the
GOINSECURE environment variable instead. To bypass module
sum validation, use GOPRIVATE or GONOSUMDB.
See go help environment for details.
all pattern
When the main module's go.mod file
declares go 1.16 or higher, the all
package pattern now matches only those packages that are transitively imported
by a package or test found in the main module. (Packages imported by tests
of packages imported by the main module are no longer included.) This is
the same set of packages retained
by go mod vendor since Go 1.11.
The cgo tool will no longer try to translate C struct bitfields into Go struct fields, even if their size can be represented in Go. The order in which C bitfields appear in memory is implementation dependent, so in some cases the cgo tool produced results that were silently incorrect.
TODO
TODO
TODO
This release includes additional improvements to the Go linker, reducing linker resource usage (both time and memory) and improving code robustness/maintainability. These changes form the second half of a two-release project to modernize the Go linker.
The linker changes in 1.16 extend the 1.15 improvements to all
supported architecture/OS combinations (the 1.15 performance improvements
were primarily focused on ELF-based OSes and
amd64 architectures). For a representative set of
large Go programs, linking is 20-35% faster than 1.15 and requires
5-15% less memory on average for linux/amd64, with larger
improvements for other architectures and OSes.
TODO: update with final numbers later in the release.
TODO
I/O operations on closing or closed TLS connections can now be detected using
the new ErrClosed error. A typical use
would be errors.Is(err, net.ErrClosed). In earlier releases
the only way to reliably detect this case was to match the string returned
by the Error method with "tls: use of closed connection".
ParseCertificate and
CreateCertificate both
now enforce string encoding restrictions for the fields DNSNames,
EmailAddresses, and URIs. These fields can only
contain strings with characters within the ASCII range.
The case of I/O on a closed network connection, or I/O on a network
connection that is closed before any of the I/O completes, can now
be detected using the new ErrClosed error.
A typical use would be errors.Is(err, net.ErrClosed).
In earlier releases the only way to reliably detect this case was to
match the string returned by the Error method
with "use of closed network connection".
For interface types and values, Method, MethodByName, and NumMethod now operate on the interface's exported method set, rather than its full method set.
A new CommentNode
was added to the parse tree. The Mode
field in the parse.Tree enables access to it.
The unicode package and associated
support throughout the system has been upgraded from Unicode 12.0.0 to
Unicode 13.0.0,
which adds 5,930 new characters, including four new scripts, and 55 new emoji.
Unicode 13.0.0 also designates plane 3 (U+30000-U+3FFFF) as the tertiary
ideographic plane.
As always, there are various minor changes and updates to the library, made with the Go 1 promise of compatibility in mind.
TODO
The crypto/dsa package is now deprecated.
See issue #40337.
DSA signature verification is no longer supported. Note that DSA signature generation was never supported. See issue #40337.
In the net/http package, the
behavior of StripPrefix
has been changed to strip the prefix from the request URL's
RawPath field in addition to its Path field.
In past releases, only the Path field was trimmed, and so if the
request URL contained any escaped characters the URL would be modified to
have mismatched Path and RawPath fields.
In Go 1.16, StripPrefix trims both fields.
If there are escaped characters in the prefix part of the request URL the
handler serves a 404 instead of its previous behavior of invoking the
underlying handler with a mismatched Path/RawPath pair.
The net/http package now rejects HTTP range requests
of the form "Range": "bytes=--N" where "-N" is a negative suffix length, for
example "Range": "bytes=--2". It now replies with a 416 "Range Not Satisfiable" response.
Cookies set with SameSiteDefaultMode now behave according to the current
spec (no attribute is set) instead of generating a SameSite key without a value.
TODO: https://golang.org/cl/249677: provide Addr method for errors from SetPanicOnFault