loop varible is undefined in inline anonymous function in template

[xiangnanscu]

Vue version

latest

Link to minimal reproduction

https://play.vuejs.org/#eNqFUcFOwzAM/RUrl7bS1gqOoxsDCRDiAAc4LTuUkqKKNIkaDyFV+XecZmXdijQpBz/7xX5+7tiNMen3TrAFy1E0RhYoVlwB5LWStRJzFBY9BkDxg0vObt8eOAuZtRVSlDivaikslUIWIO6gT4FLYLmCbsgDVLqFuNTKYs8AXQVmMiYBSP0ZR0URzfrqdaqKRiRXB4Ybwn0QRme98GPpg+rnJ84megO894gz/zvPRh7ktmxrg2AF7gzhujG6RXjsm7/63lWrG5qdZoec9zKo4SrsSbvAEnyspUgJDYXRdCL859lZt0ZdY86KgrOpY2QRvTwL29AebMaO9U5v/75D1ArWpazLLzJKNDXG0UgwXWavdwGbDvy0BVyAmw3xJbgtrcLZqutMq41N/SGcy7PQ+9Tsqd1h7/4v2fMhKlL84lG8iXyvaJsMJC/vj3NHgDgn1916M8YmuF91Vv1F

Steps to reproduce

Click BUG, you will see console output:

aa undefined

What is expected?

output should be:

aa 1
aa 2

What is actually happening?

aa undefined

System Info

No response

Any additional comments?

No response

[sphinxrave]

It was compiled to ...

_createVNode(__import_1__.default, {
      text: "BUG",
      onSelectFiles: _cache[0] || (_cache[0] = 
      (a) => {
        for (const file of a.files) {
          _unref(log)('aa', _ctx.file.name);
        }
      }
    )//...

renaming file to other variables does not change behavior. Vue probably didn't pick up that this is a local variable and instead assumes all vars are on _ctx

[edison1105]

duplicate of #7238