Nested fat arrow closures cause false positive for UndefinedVariable

[stefanfisk]

Here's a simple example that generates UndefinedVariable for the second $item in the array.

$fn = fn($item) => [
    $item,
    fn($arg) => $arg,
    $item,
];

This works fine.

$fn = function($item) {
    return [
        $item,
        fn($arg) => $arg,
        $item,
    ];
}

I am using v2.11.19 but the issue has been around for years, I've just never gotten around to opening an issue.

[sirbrillig]

Thank you for the report! I don't think I ever did enough testing with nested fat arrow functions.

[sirbrillig]

Should be fixed by #334