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
extconf.rb
groupie
ndk-gdb
itemwriter
dart-editor
camel-file
doctrine-1.2
jquery-countdown
openoffice-calc
dgl
weak-entity
mediatorlivedata
heredoc
symfony-finder
scntechnique
automap
navigation-architecture
grunt-contrib-sass
angular-dependency-injection
gesturedetector
cascade
msbuild-wpp
camera-intrinsics
vram
diamond-problem
android-appwidget-list
isnull
textdecoder
mybatis-sql
azure-web-pubsub