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static ItIt<Matches> flexMatchIC_tok_iterator(Tok pat, Tok input) {
  LS tokPat = pat.tok(), tokInput = input.tok();
  L<Int> varIndices = flexMatchIC_getVarIndices(tokPat, tokInput);
  ifdef flexMatchIC_tok_iterator_debug
    print(+varIndices);
  endifdef
  if (varIndices == null) ret emptyItIt();

  ItIt<LS> spreadInputs = ai_spreadCertainIndices_2_iterator(pat.tok(), input.tok(), varIndices);
  
  ret mapI_notNulls(tok -> {
    ifdef flexMatchIC_tok_iterator_debug
      print(+tok);
    endifdef
    ret getMatches(tokPat, tok);
  }, spreadInputs);
}