The sys package provides access to the arguments given to Lily.
define getenv(name: String): Option[String]
Search the environment for
name, returning either a
Some with the contents,
None. Internally, this is a wrapper over C's getenv.
define recursion_limit: Integer
Return the current recursion limit.
define set_recursion_limit(limit: Integer)
Attempt to set
limit as the maximum recursion limit.
limitis lower than the current recursion depth, or an
var argv: List[String]
This contains arguments sent to the program through the command-line. If Lily was not invoked from the command-line (ex: mod_lily), then this is empty.