<?php interface I {} interface J {} // Simulate a "never" parameter type. interface AlmostNever extends I, J {} class C implements I {} interface Base { public function foo(AlmostNever $x): mixed; } interface ReturnI extends Base { public function foo(AlmostNever $x): I; } interface AcceptI extends Base { public function foo(I $x): mixed; } class AcceptReturnI implements AcceptI, ReturnI { public function foo(I $x): I { return $x; } } function f(AcceptI&ReturnI $callme, I $x): I { return $callme->foo($x); } f(new AcceptReturnI(), new C());
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