self->#x:binding-provided ->out = self->#x:binding-required ->out;
self->#x:binding-required ->in = self->#x:binding-provided ->in;
self->#x:binding-provided ->meta.requires = self->#x:binding-required ->meta.requires;
self->#x:binding-required ->meta.provides = self->#x:binding-provided ->meta.provides;
