Macro mpc::run_parser

macro_rules! run_parser {
    (preparsers: $preparsers:ident
	 filename: {$filename:expr}
	 input: {$input:expr}) => { ... };
    (preparsers: $preparsers:ident
	 input: {$input:expr}) => { ... };
    (preparsers: $preparsers:ident
	 filename: {$filename:expr}) => { ... };
}

Runs a parser prepared with parser!