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<?php declare(strict_types=1); namespace Test\Biz; error_reporting(-1); class Foo { function bar($value) { if (\is_callable($value)) { return $this->baz($value); } } function baz(callable $callable): string { return $callable; } } echo (new Foo())->bar('\Test\Biz\Foo::bar');
Output for git.master, git.master_jit, rfc.property-hooks
\Test\Biz\Foo::bar

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