# Contributing to Go

Go is an open source project.

It is the work of hundreds of contributors. We appreciate your help!

## Before filing an issue

If you are unsure whether you have found a bug, please consider asking in the [golang-nuts mailing
list](https://groups.google.com/forum/#!forum/golang-nuts) or [other forums](https://golang.org/help/) first. If

/* Copyright 2011 The Go Authors. All rights reserved.
   Use of this source code is governed by a BSD-style
   license that can be found in the LICENSE file.  */

/* An example of writing a C++ virtual function in Go.  */

%module(directors="1") callback

%{
#include <string>
#include "main.h"
%}

%include "std_string.i"

%feature("director");

Because this method of setting GODEBUG defaults was introduced only in Go 1.21,
programs listing versions of Go earlier than Go 1.20 are configured to match Go 1.20,
not the older version.

To override these defaults, a main package's source files
can include one or more `//go:debug` directives at the top of the file
(preceding the `package` statement).
Continuing the `panicnil` example, if the module or workspace is updated

pkg syscall (freebsd-riscv64), const IP_ADD_SOURCE_MEMBERSHIP = 70 #53466
pkg syscall (freebsd-riscv64), const IP_ADD_SOURCE_MEMBERSHIP ideal-int #53466
pkg syscall (freebsd-riscv64), const IP_BINDANY = 24 #53466
pkg syscall (freebsd-riscv64), const IP_BINDANY ideal-int #53466
pkg syscall (freebsd-riscv64), const IP_BLOCK_SOURCE = 72 #53466
pkg syscall (freebsd-riscv64), const IP_BLOCK_SOURCE ideal-int #53466

pkg syscall (linux-386), const IP_ADD_SOURCE_MEMBERSHIP = 39
pkg syscall (linux-386), const IP_BLOCK_SOURCE = 38
pkg syscall (linux-386), const IP_DEFAULT_MULTICAST_LOOP = 1
pkg syscall (linux-386), const IP_DEFAULT_MULTICAST_TTL = 1
pkg syscall (linux-386), const IP_DF = 16384
pkg syscall (linux-386), const IP_DROP_MEMBERSHIP = 36
pkg syscall (linux-386), const IP_DROP_SOURCE_MEMBERSHIP = 40

pkg math/rand/v2, type ChaCha8 struct #61716
pkg math/rand/v2, type PCG struct #61716
pkg math/rand/v2, type Rand struct #61716
pkg math/rand/v2, type Source interface { Uint64 } #61716
pkg math/rand/v2, type Source interface, Uint64() uint64 #61716
pkg math/rand/v2, type Zipf struct #61716
pkg net, method (*TCPConn) WriteTo(io.Writer) (int64, error) #58808
pkg net/http, func FileServerFS(fs.FS) Handler #51971

On Windows, [EvalSymlinks] no longer evaluates mount points,
which was a source of many inconsistencies and bugs.
This behavior is controlled by the `winsymlink` setting.
For Go 1.23, it defaults to `winsymlink=1`.
Previous versions default to `winsymlink=0`.

On Windows, [EvalSymlinks] no longer tries to normalize
volumes to drive letters, which was not always even possible.
This behavior is controlled by the `winreadlinkvolume` setting.

pkg log/slog, type Record struct, PC uintptr #56345
pkg log/slog, type Record struct, Time time.Time #56345
pkg log/slog, type Source struct #59280
pkg log/slog, type Source struct, File string #59280
pkg log/slog, type Source struct, Function string #59280
pkg log/slog, type Source struct, Line int #59280
pkg log/slog, type TextHandler struct #56345
pkg log/slog, type Value struct #56345