sonic-pi

https://github.com/sonic-pi-net/sonic-pi

C++

Code. Music. Live.

Parslet::Atoms::CanFlatten#warn_about_duplicate_keys

That annoying warning 'Duplicate subtrees while merging result' comes 
from here. You should add more '.as(...)' names to your intermediary tree.

Source | Google | Stack overflow

Edit

git clone [email protected]:sonic-pi-net/sonic-pi.git

cd sonic-pi

open app/server/ruby/vendor/parslet/lib/parslet/atoms/can_flatten.rb

Contribute

# Make a new branch

git checkout -b -your-name--update-docs-Parslet--Atoms--CanFlatten-warn_about_duplicate_keys-for-pr

# Commit to git

git add app/server/ruby/vendor/parslet/lib/parslet/atoms/can_flatten.rbgit commit -m "better docs for Parslet::Atoms::CanFlatten#warn_about_duplicate_keys"

# Open pull request

gem install hub # on a mac you can `brew install hub`

hub fork

git push <your name> -your-name--update-docs-Parslet--Atoms--CanFlatten-warn_about_duplicate_keys-for-pr

hub pull-request

# Celebrate!