Use

The first id in idcall is either a module or library (libraries are declared with progname). If use ends with .*, then all public semantics of idcall are accessible in the current environment and all children environemts otherwise only the semantic referenced by idcall can be accessed.

Example:

hello.feder:

use mod helloprinter
use std.io

func printHello
    io.out.println("Hello, World!")
;

program.feder:

use helloprinter

func main
    io.out.println("Hello, World!")
;