with! open!("examples/record.er"), f =>
    print! f.read!()

with! open!("examples/set.er"), f =>
    for! f.readlines!(), line =>
        print!("line: " + line)

open_file!(path) =
    with! open!(path, mode:="r" , encoding:="utf_8"), f =>
        data = f.read!()
        data

print! open_file!("examples/record.er")