getopt 1.1.9

A minimal, (essentially) POSIX-compliant option parser
Documentation 
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/// What kinds of errors [`Parser`](struct.Parser.html) can return.
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
pub enum ErrorKind {
    /// An argument was not found for an option that was expecting one.
    MissingArgument,
    /// An unknown option character was encountered.
    UnknownOption,
}