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<?php abstract class A { function f(Z $a) { } } class B extends A { function f(Y $a) { } } abstract class Z { } class Y extends Z { }
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Declaration of B::f(Y $a) must be compatible with A::f(Z $a) in /in/jH1Bq on line 4
Process exited with code 255.

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