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Chapter 6. Changes in Go Toolset 1.23

RHEL provides Go Toolset in version 1.23. Notable enhancements include:

  • The for-range loop accepts iterator functions of the following types:

    • func(func() bool)
    • func(func(K) bool)

    • func(func(K, V) bool)

      Calls of the iterator argument function create the iteration values for the for-range loop. For reference links, see the upstream release notes.

  • The Go Toolchain can collect usage and breakage statistics to help the Go team to understand how the Go Toolchain is used and working. By default, Go Telemetry does not upload telemetry data and stores it only locally. For further information, see the upstream Go Telemetry documentation.
  • The go vet subcommand includes the stdversion analyzer which flags references to symbols that are too new for the version of Go you use in the referring file.
  • The cmd and cgo features support the -ldflags option to pass flags to the C linker. The go command uses this flag automatically to avoid argument list too long errors when you use a very large CGO_LDFLAGS environment variable.
  • The trace utility tolerates partially broken traces and attempts to recover the trace data. This is useful in case of crashes because you can get the trace leading up to the crash.
  • The traceback printed by the runtime after an unhandled panic or other fatal error carries indentation to distinguish the stack trace of the goroutine from the first goroutine.
  • The compiler build time overhead of using profile-guided optimization was reduced to single-digit percentage.
  • The new -bindnow linker flag enables immediate function binding when building a dynamically-linked ELF binary.
  • The //go:linkname linker directive no longer refer to internal symbols in the standard library and the runtime that are not marked with //go:linkname on their definition.
  • If a program no longer refers to a Timer or Ticker, garbage collection cleans them up immediately even if their Stop method has not been called. The timer channel associated with a Timer or Ticker is now unbuffered with capacity 0. This ensures that, every time a Reset or Stop method is called, no stale values are not sent or received after the call.
  • The new unique package provides facilities for canonicalizing values, such as interning or hash-consing.
  • The new iter package provides the basic definitions to work with user-defined iterators.
  • The slices and maps packages introduce several new functions that work with iterators.
  • The new structs package provides types for struct fields that modify properties of the containing struct type, such as memory layout.

  • Minor changes are made in the following packages:

    • archive/tar
    • crypto/tls
    • crypto/x509
    • database/sql
    • debug/elf
    • encoding/binary
    • go/ast
    • go/types
    • math/rand/v2
    • net
    • net/http
    • net/http/httptest
    • net/netips
    • path/filepath
    • reflect
    • runtime/debug
    • runtime/pprof
    • runtime/trace
    • slices
    • sync
    • sync/atomic
    • syscall
    • testing/fstest
    • text/template
    • time
    • unicode/utf16

For more information, see the upstream release notes.

Go Toolset is a rolling Application Stream, and Red Hat supports only the latest version. For more information, see the Red Hat Enterprise Linux Application Streams Life Cycle document.

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