Type Definition nom::IResult

type IResult<I, O, E = (I, ErrorKind)> = Result<(I, O), Err<E>>;

Holds the result of parsing functions

It depends on I, the input type, O, the output type, and E, the error type (by default u32)

The Ok side is a pair containing the remainder of the input (the part of the data that was not parsed) and the produced value. The Err side contains an instance of nom::Err.