# Single-expression body.
var c = 0;
while (c < 3) {
  print(c = c + 1);
}
# expect: 1
# expect: 2
# expect: 3

# Block body.
var a = 0;
while (a < 3) {
  print(a);
  a = a + 1;
}
# expect: 0
# expect: 1
# expect: 2

# Statement bodies.
while (false) {
  if (true) {
    1;
  } else {
    2;
  }
}
while (false) {
  while (true) {
    1;
  }
}
while (false) {
  for (;;) {
    1;
  }
}