jruby

https://github.com/jruby/jruby

Ruby

JRuby, an implementation of Ruby on the JVM

WeakRef#initialize

Creates a weak reference to +orig+

Raises an ArgumentError if the given +orig+ is immutable, such as Symbol,
Fixnum, or Float.

Source | Google | Stack overflow

Edit

git clone [email protected]:jruby/jruby.git
cd jruby
open lib/ruby/stdlib/weakref.rb

Contribute

# Make a new branch
git checkout -b -your-name--update-docs-WeakRef-initialize-for-pr

# Commit to git
git add lib/ruby/stdlib/weakref.rbgit commit -m "better docs for WeakRef#initialize"

# Open pull request
gem install hub # on a mac you can `brew install hub`
hub fork
git push <your name> -your-name--update-docs-WeakRef-initialize-for-pr
hub pull-request

# Celebrate!