Function binread::error::magic

pub fn magic<R, B>(
    reader: &mut R, 
    expected: B, 
    options: &ReadOptions
) -> BinResult<()> where
    B: BinRead<Args = ()> + PartialEq + Sync + Send + 'static,
    R: Read + Seek, 

Read a value then check if it is the expected value