Module compiler

`env`

args and cwd need no grant. Reading or changing variables and set_cwd need --allow-env, exec needs --allow-exec and exit needs --allow-exit; see Permissions. exec runs a program with an argument vector, without a shell, in the current working directory and environment.

Built into the compiler.

Import what you use (use path::* is not allowed):

use env::{EnvError, args};

Types#

Name	Description
`EnvError`	The error of every fallible `env` function.

Functions#

Name	Description
`args`	Returns the program’s command-line arguments, starting with the program name.
`var`	Returns the value of the environment variable `name`.
`set_var`	Sets the environment variable `name` to `value` for this process.
`remove_var`	Removes the environment variable `name` from this process.
`cwd`	Returns the current working directory as an absolute path.
`set_cwd`	Changes the current working directory of the whole process.
`exit`	Ends the process at once with exit status `code`.
`exec`	Runs `program` with the arguments `argv` and waits for it to finish.