env:DHALL_PRELUDE
env:"Quotes variable"
----------------------------------------------------
[
["env", [
["function", "env"],
["operator", ":"],
["variable", "DHALL_PRELUDE"]
]],
["env", [
["function", "env"],
["operator", ":"],
["variable", "\"Quotes variable\""]
]]
]
----------------------------------------------------
Checks for environment variables.