Issue Type: Bug

In a JS file, write this:

(function() {
    let x = () => {
        this.y = 1;
    };
})();

VS Code shows dots below the f of function and suggests (yellow bulb) to convert the function into an ES2015 class. However, applying the quick fix does nothing for me.

I tried it by various ways. These three ways to open the quick fix dropdown:

• Setting the cursor to the f, then clicking the bulb
• Setting the cursor to the f, then pressing Ctrl+.
• Hovering the f, then clicking on the "Show quick fixes ..." link in the popup's footer

And those two ways to accept the quick fix:

• Clicking the dropdown entry
• Pressing Enter on the entry

All 6 combinations to not work.

The quick fix to remove the declaration of x does work (blue bulb), so it might either be that particular quick fix or because it's a different issue level.

VS Code version: Code 1.38.1 (b37e54c, 2019-09-11T13:35:15.005Z)
OS version: Windows_NT x64 10.0.18362