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WHICH_IDX_name - Which Equivalenced Index

This macro gets emitted only for equivalenced-to options. It is used to obtain the index for the one of the several equivalence class members set the equivalenced-to option.

switch (WHICH_IDX_OTHER_OPT) {
case INDEX_OPT_NAME:
    this-option-was-really-opt-name;
case INDEX_OPT_OTHER_OPT:
    this-option-was-really-other-opt;
}

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