Macro nom::fix_error

macro_rules! fix_error {
    ($i:expr, $t:ty, $submac:ident!( $($args:tt)* )) => { ... };
    ($i:expr, $t:ty, $f:expr) => { ... };
}

translate parser result from IResult<I,O,u32> to IResult<I,O,E> with a custom type