static Matches flexMatchIC_first(S pat, S input) {
  ret first(flexMatchIC_iterator(pat, input));
}
  
static Matches flexMatchIC_first(Tok pat, Tok input) {
  ret first(flexMatchIC_iterator(pat, input));
}

static Matches flexMatchIC_first(S pat, LS tokPat, LS tokInput) {
  ret first(flexMatchIC_iterator(pat, tokPat, tokInput));
}