:default ::= action => [values]
    :start              ::= Definitions
    :discard            ~ ws

    Definitions ::= Definition +
    Definition         ::= Alias <new line>

##</code><code>##

    ws                  ~ <ws element> +
    <ws element> ~ [\s]
    <ws element> ~ backslash [\n]
    <backslash>          ~ '\'