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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; }