!7

sS input = "plants grow";

p {
  ai_alternativeSmartBot();
  
  WordSequence pat = WordSequence(
    SomethingWhichIs("a noun"),
    SomethingWhichIs("a verb"));
  printStruct(pat);
  
  WordSequence real = WordSequence("plants", "grow");
  printStruct(real);
  
  new IdentityHashMap map;
  if (matchWordSequence(pat, real, map))
    printStruct(map);
  else
    print("no match");
}

static bool matchWordSequence(WordSequence pat, WordSequence real, Map map) {
  int n = l(pat.l);
  if (n != l(real.l)) false;
  for i to n:
    if (!matchElement(pat.l.get(i), real.l.get(i), map)) false;
  true;
}

static bool matchElement(O pat, O real, Map map) {
  if (eq(pat, real)) true;
  if (pat << SomethingWhichIs && real instanceof S) {
    if (!ai_is(quote((S) real), pat/SomethingWhichIs.type)) false;
    print("Assigning " + pat + " => " + real);
    ret strictPut(map, pat, real);
  }  
  false;
}

Began life as a copy of #1012746