fn detect_assignment_op(bytes: &[u8], pos: usize) -> Option<(Option<u8>, usize)>Expand description
Detect an assignment operator starting at byte offset pos in
bytes. Returns Some((Some(op_char), after_eq)) for compound
assignments (+=, -=, *=, /=), Some((None, after_eq)) for
plain =, or None if no recognised assignment op (or == /
other comparison) starts here.