The loopback resolver is a trivial component resolver that proxies a Resolver request to its incoming fuchsia.component.resolution/Resolver protocol.
This is useful if you want to transform a fuchsia.component.resolution/Resolver protocol capability into a resolver capability. It can also be used to break a cycle that would occur if you assigned a resolver to a child environment directly, by adding the loopback_resolver as a child component and feeding it the fuchsia.component.resolution/Resolver which was offered as weak by the parent. However, this should be done with caution since once the source resolve is shutdown (during system shutdown, for instance) further attempts to resolve components backed by the loopback_resolver will fail.