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<?php declare(strict_types=1); class CallableString { private string $foo; public function doFoo(callable $foo): void { $this->foo = $foo; var_dump($this->foo); } } $c = new CallableString(); $c->doFoo('CallableString::doFoo');
Output for git.master_jit, git.master, rfc.property-hooks
string(21) "CallableString::doFoo"

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