other_var: int  = 'a'  # Flagged as error by type checker,
                              # but OK at runtime.

sane_world: bool
if 2+2 == 4:
    sane_world = True
else:
    sane_world = False

>>> import ctypes
>>> ctypes.cast(id(4), ctypes.POINTER(ctypes.c_int))[6] = -6
>>> 3
3
>>> 4
4294967290
>>> 2
2
>>> 2+2==4
True
>>> 2+2
4294967290

>>> 2+1+1
4294967290

>>> import ctypes
>>> ctypes.cast(id(9), ctypes.POINTER(ctypes.c_int))[6] = 8
>>> 8
8
>>> 8 + 9
16
>>> 9
8
>>> 9/9
1.0

1LET4=5

2PRINT2+2

>>>5

 class Fixnum
  def +(arg)
    if self == 9 and arg == 10 then
      return 21
    else
      return self--arg
    end
  end
end

❯ python3
Python 3.5.2 (default, Jun 29 2016, 13:43:58)
[GCC 4.2.1 Compatible Apple LLVM 7.3.0 (clang-703.0.31)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import ctypes
>>> ctypes.cast(id(9), ctypes.POINTER(ctypes.c_int))[6] = 11
>>> 9 + 10
21

>>> ctypes.cast(id(2), ctypes.POINTER(ctypes.c_int))[6] = 3
>>> 2
3
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
OSError: raw write() returned invalid length 3 (should have been between 0 and 2)
3
>>> 2-2
3
0
>>> 3-5
[1]    37551 segmentation fault  python3

  template<bool V> struct answer { answer(int) {} bool operator()(){return V;}};

template<bool no, bool yes, int f, int p> struct IsPrimeHelper
  : IsPrimeHelper<p % f == 0, f * f >= p, f + 2, p> {};
template<bool yes, int f, int p> struct IsPrimeHelper<true, yes, f, p> { using type = answer<false>; };
template<int f, int p> struct IsPrimeHelper<false, true, f, p> { using type = answer<true>; };

template<int I> using IsPrime = typename IsPrimeHelper<!(I&1), false, 3, I>::type;
template<int I>