babel/packages/babel-plugin-proposal-do-expressions/test/fixtures/do-expressions/loops/input.js

for (
  let i = do { effects.push(1); 0 } ;
  i < do { effects.push(2); 3 } ;
  do { effects.push(4); i++ }
) {
  effects.push(3);
}

for (let i in do { effects.push(1); ({ x: 1, y: 2 }) }) {
  effects.push(i);
}

for (let i of do { effects.push(1); [2, 3] }) {
  effects.push(i);
}

let x = 0;
while (do { effects.push(1); x < 3 }) {
  effects.push(2);
  x++;
}

let y = 0;
do {
  effects.push(1);
  y++;
}
while (do { effects.push(2); y < 3 });