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<?php abstract class Foo {} class Bar extends Foo {} abstract class Builder { function doIt($foo) {} } class RealBuilder extends Builder { function doIt(Bar $bar) { var_dump($bar); } } $builder = new RealBuilder(); $bar = new Bar(); $builder->doIt($bar);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Declaration of RealBuilder::doIt(Bar $bar) must be compatible with Builder::doIt($foo) in /in/8ISla on line 15
Process exited with code 255.

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