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Carlo Alberto Ferraris 4f55a5af5e sync: do not unnecessarily keep alive functions wrapped by Once(Func|Value|Values) 
The function passed to OnceFunc/OnceValue/OnceValues may transitively
keep more allocations alive. As the passed function is guaranteed to be
called at most once, it is safe to drop it after the first call is
complete. This avoids keeping the passed function (and anything it
transitively references) alive until the returned function is GCed.

Change-Id: I2faf397b481d2f693ab3aea8e2981b02adbc7a21
Reviewed-on: https://go-review.googlesource.com/c/go/+/481515
Reviewed-by: Austin Clements <austin@google.com>
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README.md

The Go Programming Language

Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.

Gopher image Gopher image by Renee French, licensed under Creative Commons 4.0 Attributions license.

Our canonical Git repository is located at https://go.googlesource.com/go. There is a mirror of the repository at https://github.com/golang/go.

Unless otherwise noted, the Go source files are distributed under the BSD-style license found in the LICENSE file.

Download and Install

Binary Distributions

Official binary distributions are available at https://go.dev/dl/.

After downloading a binary release, visit https://go.dev/doc/install for installation instructions.

Install From Source

If a binary distribution is not available for your combination of operating system and architecture, visit https://go.dev/doc/install/source for source installation instructions.

Contributing

Go is the work of thousands of contributors. We appreciate your help!

To contribute, please read the contribution guidelines at https://go.dev/doc/contribute.

Note that the Go project uses the issue tracker for bug reports and proposals only. See https://go.dev/wiki/Questions for a list of places to ask questions about the Go language.