Couldn't find the language specification anywhere, it basically the Nix source? The repo's README refers to the Nix manual, but it seems incomplete. For example
python-unittest
jwk
project-loom
olsmultiplelinearregression
plasticscm
gollum-wiki
backslash
safari-extension
jms-serializer
delicious-api
zalenium
sbt
code-rally
spek
castor
mxmaster3
android-enterprise-features
mesa
cmake-language
opencensus
jquery-bar-rating
pydicom
optimizer-hints
jquery-ui-dialog
call-user-func-array
mongoid
autoreconf
timezone-offset
react-native-video
argouml