Enum Run 

pub enum Run {
    Library,
    Returned(Value),
    Exit(u8),
    Raised(Raised),
}

How running a program’s __main against IO ended.

Variants

Library

The module has no __main: it is a library rather than a program.

Returned(Value)

__main returned this value. A runner ignores it — printing a result is REPL behaviour — except to notice an entry still wanting arguments.

Exit(u8)

IO.Proc.return asked for this exit status.

Raised(Raised)

A raise reached the top.