Env: module {	getenv:	fn(var: string): string;		# returns nil if var not set	setenv:	fn(var: string, val: string): int;	# returns -1 on failure	getall: fn(): list of (string, string); 	clone:	fn(): int;					# forks a copy of the environment, returns -1 on failure	new:		fn(): int;					# sets up new empty environment, returns -1 on failure 	PATH:	con "/dis/lib/env.dis";};