wrong behavior in for loop

[uni-zheng]

Bug Report

Current Behavior
Just print log once.

Input Code

• REPL or Repo link if applicable:

for (let i = 0; i < 3; i++) {
  let i = 'abc';
  console.log(i);
}

Output Code

"use strict";

for (var i = 0; i < 3; i++) {
  var i = "abc";
  console.log(i);
}

Expected behavior/code
print log 3 times

Environment
use https://new.babeljs.io/repl
set presets both es2015 and stage-3
version v6.26.0

Possible Solution
Should create temporary variable in body.

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[byronluk]

Hi I'm going to try to look at this. Thanks!

[byronluk]

@nicolo-ribaudo Is it a better choice to add a closure inside the block scope or to rename the block scoped variable that is colliding with the for loop initializer?

[nicolo-ribaudo]

Renaming the variable would be better, but if it is too complex we can just wrap the for body in a block, like in #8920, since it isn't a common case.