GREEK PROSGEGRAMMENI and COMBINING GREEK YPOGEGRAMMENI fold to the
the first character of one of the tricky folds, and hence need
to be treated as potentially tricky themselves.
break;
case 0x03B9: /* First char in iota series */
case 0x0399: /* Also capital IOTA */
+ case 0x1FBE: /* GREEK PROSGEGRAMMENI folds to 3B9 */
+ case 0x0345: /* COMBINING GREEK YPOGEGRAMMENI folds
+ to 3B9 */
if (p < RExC_end - 4) {
latest_char_state = iota_1;
if (len != 0) {