Macro byte_search

macro_rules! byte_search {
    (
        lexer: $lexer:ident,
        table: $table:ident,
        handle_eof: $eof_handler:expr $(,)?
    ) => { ... };
    (
        lexer: $lexer:ident,
        table: $table:ident,
        continue_if: ($byte:ident, $pos:ident) $should_continue:expr,
        handle_eof: $eof_handler:expr $(,)?
    ) => { ... };
}