Method skip_while

ppcc/src/parser.cc:81–85

    }
  }
  void skip_while(Word64 syms) {
    while (TEST(syms, input->at(pos).sym)) {
      pos++;
    }
  }
  noinline Int find_back_until(Word64 syms) {
    Int p = pos;
    while (p > marker) {