[Bug]: Regression with let in loops

[nicolo-ribaudo]

💻

• Would you like to work on a fix?

How are you using Babel?

Other (Next.js, Gatsby, vue-cli, ...)

Input code

var objects = [];
var i = 0;
for (var proto of [0, 1 ,2]) if (true) {
  let _obj = i;
  i++;
  
  objects.push({
    foo() {
      return _obj;
    }
  });
}

console.assert(objects[0].foo()===0,objects[0].foo());

Configuration file name

No response

Configuration

No response

Current and expected behavior

old babel

repl

Environment

/

Possible solution

No response

Additional context

#15948 (comment)