https://git.ruby-lang.org/ruby.git/commit/?id=26a07b8b46

From 26a07b8b46d0ae775d01c023146881564f285419 Mon Sep 17 00:00:00 2001
From: Stan Lo <stan.lo@s...>
Date: Wed, 11 May 2022 17:03:39 +0100
Subject: Add a separate doc for contributing to stdlibs [ci skip]

co-authored-by: Peter Zhu <peter@p...>
---
 doc/contributing.md                           |  5 +--
 doc/contributing/making_changes_to_ruby.md    |  8 -----
 doc/contributing/making_changes_to_stdlibs.md | 49 +++++++++++++++++++++++++++
 3 files changed, 52 insertions(+), 10 deletions(-)
 create mode 100644 doc/contributing/making_changes_to_stdlibs.md

diff --git a/doc/contributing.md b/doc/contributing.md
index 1f53e6f56e..a8deea7969 100644
--- a/doc/contributing.md
+++ b/doc/contributing.md
@@ -5,6 +5,7 @@ This guide outlines ways to get started with contributing to Ruby: https://github.com/ruby/ruby/blob/trunk/doc/contributing.md#L5
 * [Reporting issues](contributing/reporting_issues.md): How to report issues, how to request features, and how backporting works
 * [Building Ruby](contributing/building_ruby.md): How to build Ruby on your local machine for development
 * [Testing Ruby](contributing/testing_ruby.md): How to test Ruby on your local machine once you've built it
-* [Making changes to Ruby](contributing/making_changes_to_ruby.md): How to submit pull requests 
+* [Making changes to Ruby](contributing/making_changes_to_ruby.md): How to submit pull requests
   to change Ruby's documentation, code, test suite, or standard libraries
-* [Making changes to Ruby documentation](contributing/documentation_guide.md): How to make changes to Ruby documentation
\ No newline at end of file
+* [Making changes to Ruby standard libraries](contributing/making_changes_to_stdlibs.md): How to build, test, and contribute to Ruby standard libraries
+* [Making changes to Ruby documentation](contributing/documentation_guide.md): How to make changes to Ruby documentation
diff --git a/doc/contributing/making_changes_to_ruby.md b/doc/contributing/making_changes_to_ruby.md
index 6842ec2888..260fadb7e3 100644
--- a/doc/contributing/making_changes_to_ruby.md
+++ b/doc/contributing/making_changes_to_ruby.md
@@ -26,11 +26,3 @@ Use the following style for commit messages: https://github.com/ruby/ruby/blob/trunk/doc/contributing/making_changes_to_ruby.md#L26
 GitHub actions will run on each pull request.
 
 There is [a CI that runs on master](https://rubyci.org/). It has broad coverage of different systems and architectures, such as Solaris SPARC and macOS.
-
-# Contributing to standard libraries
-
-Everything in the [lib](https://github.com/ruby/ruby/tree/master/lib) directory is mirrored from a standalone repository into the Ruby repository.
-If you'd like to make contributions to standard libraries, do so in the standalone repositories, and the
-changes will be automatically mirrored into the Ruby repository.
-
-For example, CSV lives in [a separate repository](https://github.com/ruby/csv) and is mirrored into [Ruby](https://github.com/ruby/ruby/tree/master/lib/csv).
diff --git a/doc/contributing/making_changes_to_stdlibs.md b/doc/contributing/making_changes_to_stdlibs.md
new file mode 100644
index 0000000000..ef3811ea12
--- /dev/null
+++ b/doc/contributing/making_changes_to_stdlibs.md
@@ -0,0 +1,49 @@ https://github.com/ruby/ruby/blob/trunk/doc/contributing/making_changes_to_stdlibs.md#L1
+# Making Changes To Standard Libraries
+
+Everything in the [lib](https://github.com/ruby/ruby/tree/master/lib) directory is mirrored from a standalone repository into the Ruby repository.
+If you'd like to make contributions to standard libraries, do so in the standalone repositories, and the
+changes will be automatically mirrored into the Ruby repository.
+
+For example, CSV lives in [a separate repository](https://github.com/ruby/csv) and is mirrored into [Ruby](https://github.com/ruby/ruby/tree/master/lib/csv).
+
+## Maintainers
+
+You can find the list of maintainers [here](https://docs.ruby-lang.org/en/master/maintainers_rdoc.html#label-Maintainers).
+
+## Build
+
+First, install its dependencies using:
+
+```
+bundle install
+```
+
+### Libraries with C-extension
+
+If the library has a `/ext` directory, it has C files that you need to compile with:
+
+```
+bundle exec rake compile
+```
+
+## Running tests
+
+All standard libraries use [test-unit](https://github.com/test-unit/test-unit) as the test framework.
+
+To run all tests:
+
+```
+bundle exec rake test
+```
+
+To run a single test file:
+
+```
+bundle exec rake test TEST="test/test_foo.rb"
+```
+
+To run a single test case:
+
+```
+bundle exec rake test TEST="test/test_foo.rb" TESTOPS="--name=/test_mytest/"
+```
-- 
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