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struct Attributes {
    // pattern matching attributes
    unsigned int is_orderless: 1;
    unsigned int is_flat: 1;
    unsigned int is_oneidentity: 1;
    unsigned int is_listable: 1;
    // calculus attributes
    unsigned int is_constant: 1;
    unsigned int is_numericfunction: 1;
    // rw attributes
    unsigned int is_protected: 1;
    unsigned int is_locked: 1;
    unsigned int is_readprotected: 1;
    // evaluation hold attributes
    unsigned int is_holdfirst: 1;
    unsigned int is_holdrest: 1;
    unsigned int is_holdall: 1;
    unsigned int is_holdallcomplete: 1;
    // evaluation nhold attributes
    unsigned int is_nholdfirst: 1;
    unsigned int is_nholdrest: 1;
    unsigned int is_nholdall: 1;
    // misc attributes
    unsigned int is_sequencehold: 1;
    unsigned int is_temporary: 1;
    unsigned int is_stub: 1;
};