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Nikita Popov
49a3b03e9f
This is a minimal variance implementation: It does not support any cyclic type dependencies. Additionally the preloading requirements are much more restrictive than necessary. Hopefully we can relax these in the future.
42 lines
811 B
PHP
42 lines
811 B
PHP
<?php
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// Requires X, delay to runtime.
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// TODO: It is not actually required, because we don't need X to check inheritance in this case.
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class A extends Z {
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public function method(X $a) {}
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}
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class B extends Z {
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public function method($a) : X {}
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}
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// Works.
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class C extends Z {
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public function method($a): self {}
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public function method2($a): C {}
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}
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class D extends C {
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public function method($a): self {}
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public function method2($a): D {}
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}
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// Works.
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interface I {}
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interface J extends I {}
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class E {
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public function method($a): I {}
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}
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class F extends E {
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public function method($a): J {}
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}
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// Requires K & L, delay to runtime.
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class G {
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public function method($a): K {}
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}
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class H extends G {
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public function method($a): L {}
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}
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// Early-binding preventer.
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class Z {}
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