ref: 7a98fbfa64e0a53f772dce3f3c4b488dfb68f147
dir: /module/env.m/
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";
};