var f(a, b, c, d, e, f) {
  var D = a * d - b * c;
  var Dx = e * d - b * f;
  var Dy = a * f - e * c;
  return (Dx / D, Dy / D);
}

var test8() {
  return -4;
}

var test3(a) {
  int x = a * 10;
  a += 1;
  int x = x + 3;
  {
    int y = x + 2;
    x = y + a;
  }
  int z = 5;
  return x * (z + a);
}

var test2(a) {
  (var x, var y) = a /% 10;
  return x + y;
}

var test2a(a) {
  var (x, y) = a /% 10;
  return x + y;
}

var test2b(a) {
  var z = a /% 10;
  return _+_ z;
}

var test2c(a) {
  return _+_ (a /% 10);
}

var twice(f, x) {
  return f (f x);
}

var test() {
  return f(1, 2, 3, 4, 7, 17);
}

var rot(a, b, c) {
  return (b, c, a);
}

var rot_int(int a, int b, int c) {
  return (b, c, a);
}

(int, _) dup_int(x) {
  return (x, x);
}

var calc_phi() {
  var n = 10;
  n *= n;
  n *= n;
  n *= n;
  n *= n;
  n *= n;
  n *= n;
  var p = var q = 1;
  (p, q) = (q, p + q);
  (p, q) = (q, p + q);
  (p, q) = (q, p + q);
  (p, q) = (q, p + q);
  (p, q) = (q, p + q);
  (p, q) = (q, p + q);
  (p, q) = (q, p + q);
  return muldivr(p, n, q);
}

var t0() {
  var x = 1;
  return x;
}

var t1() {
  return 2;
}

var t2(int x) {
  return 2;
  return x += 1;
}

var t3(int x, var y) {
  int z = (x + y) * (x - y);
}

var t3b(int x, var y) {
  int z = (x + y) * (x - y);
  return z;
}

var t4((int, int, int) z) {
  var (_, u, _) = z;
  return u;
}

int foo(int t);

var t5(x) {
  var f = t2;
  return twice(f, x) * f(x);
}

var proj1(a, b) { return a; }
var proj1a(a, b) { var c = a; return c; }
var proj1b(a, b) { int c = a; return c; }
var proj1c(a, b) { var c = a + 2; return c; }
var proj1d(a, b) { return a + 2; }
var proj1e(int a, _) { return a; }
int proj1f(_ a, int) { return a; }
int proj1g(int, a) { return a; }

var test1(a) {
  a = a + 1;
  return a;
}