babel/packages/babel-plugin-transform-block-scoping/test/fixtures/general/issue-4363/output.js

function WithoutCurlyBraces() {
  var _this = this;

  if (true) {
    var _loop = function (k) {
      function foo() {
        return this;
      }

      function bar() {
        return foo.call(this);
      }

      console.log(_this, k); // => undefined
    };

    for (var k in kv) {
      _loop(k);
    }
  }
}

function WithCurlyBraces() {
  var _this2 = this;

  if (true) {
    var _loop2 = function (k) {
      function foo() {
        return this;
      }

      function bar() {
        return foo.call(this);
      }

      console.log(_this2, k); // => 777
    };

    for (var k in kv) {
      _loop2(k);
    }
  }
}