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run code in 300+ PHP versions simultaneously
<?php class A { public function foo($x): B { return new B; } } class B extends A { public function foo($x): C { return new C; } } class C extends B { } (new C)->foo('blah');
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Could not check compatibility between B::foo($x): C and A::foo($x): B, because class C is not available in /in/4bHiF on line 11
Process exited with code 255.

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