Cannot bind an instance to a static closure, this will be an error in PHP 9

Description

The Closure::bind() method gives the scope of execution of a closure. And a static closure uses no scope, so the bind() method fails.

Example

<?php
    $closure = static function () { return __METHOD__;};

    $closure->bindTo(new Stdclass());
    $closure();

?>

Alternatives

• Remove the static option on the closure.
• Remove the call to bind().

Related error messages

• cannot-rebind-scope-of-closure-created-from-method,-this-will-be-an-error-in-php-9
• cannot-bind-method-%s::%s()-to-object-of-class-%s,-this-will-be-an-error-in-php-9
• cannot-rebind-scope-of-closure-created-from-function,-this-will-be-an-error-in-php-9
• cannot-unbind-$this-of-closure-using-$this,-this-will-be-an-error-in-php-9

In previous PHP versions, this error message used to be :ref:cannot-bind-an-instance-to-a-static-closure.