Go 1.20 is not yet released. These are work-in-progress release notes. Go 1.20 is expected to be released in February 2023.
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TODO: https://go.dev/cl/421440: cmd/go: add go generate -skip flag
TODO: https://go.dev/issue/45454: provide build tags for architecture environment variables
The Go distribution no longer ships with pre-compiled .a
files for most of the packages in GOROOT, now only including
.a files for the five packages in GOROOT that use cgo.
Instead, those packages will be built as needed and cached in the build
cache, as is already done for non-main packages outside
GOROOT. Further, go install will
also not install .a files for GOROOT packages
except for those that use cgo. These changes are intended to
reduce the size of the Go distribution, in some cases by up to two-thirds.
When the main module is located within GOPATH/src,
go install no longer installs libraries for
non-main packages to GOPATH/pkg,
and go list no longer reports a Target
field for such packages. (In module mode, compiled packages are stored in the
build cache
only, but a bug had caused
the GOPATH install targets to unexpectedly remain in effect.)
go version
The go version -m command
now supports reading more types of Go binaries, most notably, Windows DLLs
built with go build -buildmode=c-shared
and Linux binaries without execute permission.
TODO: https://go.dev/issue/48801: check for time formats with 2006-02-01
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TODO: https://go.dev/issue/49390: clarify whether "-l" and "-N" compiler flags are actually supported
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TODO: https://go.dev/issue/44505: adopt Go 1.17.13 as bootstrap toolchain for Go 1.20
crypto/ecdh packageTODO: complete this section
As always, there are various minor changes and updates to the library, made with the Go 1 promise of compatibility in mind. There are also various performance improvements, not enumerated here.
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TODO: https://go.dev/cl/407176: strings, bytes: add CutPrefix and CutSuffix
TODO: https://go.dev/cl/359675: bytes: add Clone function
TODO: https://go.dev/issue/34648: automatically upgrade CurveParams for known curves and deprecate custom ones
TODO: https://go.dev/issue/53021: add XORBytes
TODO: https://go.dev/cl/421435: crypto/subtle: add XORBytes; modified api/next/53021.txt
TODO: https://go.dev/cl/420982: debug/elf: add new-style LoongArch reloc types; modified api/next/54222.txt
TODO: https://go.dev/cl/421357: debug/pe: add IMAGE_FILE_MACHINE_RISCV{32,64,128}; modified api/next/54251.txt
TODO: https://go.dev/cl/420274: encoding/binary: ReadUvarint return io.ErrUnexpectedEOF when read at least 1 byte
TODO: https://go.dev/issue/53346: Add (*Encoder).Close() to check for unclosed elements
TODO: https://go.dev/cl/424777: encoding/xml: add (*Encoder).Close
TODO: https://go.dev/issue/51668: add FormatString(State) string
TODO: https://go.dev/cl/400875: fmt: add a function to recover the original format string given a State; modified api/next/51668.txt
TODO: https://go.dev/cl/421434: go/build: add GO$GOARCH-based ToolTags
TODO: https://go.dev/cl/410114: go/token: add (*FileSet).RemoveFile(*File) method
TODO: https://go.dev/issue/45899: add OffsetWriter, NewOffsetWriter
TODO: https://go.dev/cl/406776: io: add OffsetWriter, NewOffsetWriter; modified api/next/45899.txt
TODO: https://go.dev/issue/41773: add Server.OptionsHandler to allow custom handling of OPTIONS *
TODO: https://go.dev/cl/356410: net/http: add Server.DisableOptionsHandler for custom handling of OPTIONS *; modified api/next/41773.txt
TODO: https://go.dev/issue/50465: add X-Forwarded-Proto and X-Forwarded-Host by default
TODO: https://go.dev/issue/53002: replace Director with Rewrite
TODO: https://go.dev/cl/407214: net/http/httputil: add ReverseProxy.Rewrite; modified api/next/53002.txt
TODO: https://go.dev/cl/407414: net/http/httputil: add X-Forwarded-{Host,Proto} headers in ReverseProxy
The new Cmd fields Cancel and WaitDelay
specify the behavior of the Cmd when its associated
Context is canceled or its process exits with I/O pipes still
held open by a child process.
TODO: https://go.dev/cl/345488: strconv: optimize Parse for []byte arguments
TODO: https://go.dev/issue/42537: add CutPrefix and CutSuffix
TODO: https://go.dev/issue/45038: bytes, strings: add Clone
TODO: https://go.dev/cl/407574: syscall: add new CLONE_ flags for Linux
TODO: https://go.dev/issue/52746: add DateTime, DateOnly, TimeOnly format constants
TODO: https://go.dev/cl/412495: time: add DateTime, DateOnly, and TimeOnly
TODO: https://go.dev/issue/51896: add AppendRune
TODO: https://go.dev/cl/409054: unicode/utf16: add AppendRune; modified api/next/51896.txt