static bool allVarNames_debug;

static L<S> allVarNames(L<S> tok) {
  bool debug = allVarNames_debug;
  Map<Int, Int> bracketMap = getBracketMap(tok);
  new L<S> varNames;
  for (int i = 3; i < tok.size(); i += 2) {
    S t = tok.get(i);
    if (eqOneOf(t, "=", ";", ",")) {
      S v = tok.get(i-2);
      if (isIdentifier(v))
        varNames.add(v);
      if (eq(t, "=")) {
        i = scanToEndOfInitializer(tok, bracketMap, i)+1;
        assertTrue(odd(i));
      }
    } else if (eq(t, "<")) {
      i = findEndOfTypeArgs(tok, i)+1;
      if (debug)
        print("Skipped type args: " + struct(subList(tok, i)));
    } else if (eqOneOf(t, "{", "("))
      i = findEndOfBracketPart(tok, i)-1; // skip function/class bodies
  }
  return varNames;
}

static L<S> allVarNames(S text) {
  ret allVarNames(javaTok(text));
}

Began life as a copy of #1001157