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
ptv-vissim
parsefloat
mojo-useragent
sesame
servicenow
scope-resolution-operator
magento-2.0
mongodb-charts
spring-boot-configuration
apache-portable-runtime
pymongo
qtnetwork
sikuli-x
freebsd
pact-jvm
websocket-sharp
dapper-rainbow
delay-load
bengali
setjmp
jhipster-gateway
automatic-properties
gulpfile
ballerina-swan-lake
facial-identification
sphinx4
stack-overflow-talent
amazon-mq
ole-automation
netbeans-6.9