Documentation on protocol should mark all implementations as documented

[lightsprint09]

When I have a protocol called AProtocol:

protocol AProtocol {
/**
     Foo
     */
    func foo()
}

and an imlelemtation of AProtocol:

struct AImpl: AProtocol {
    func foo() {
    ///...
    }
}

AImpl.foo gets marked as missing documentation. This should not happen. You should not need to duplicate the documentation

[jpsim]

This would be great. Although pretty hard to do without making some serious changes to how SwiftLint works.

By adding a mode to SwiftLint that requires that the module 1) already be compiled; and 2) SwiftLint be passed the compiler flags; we could enable a whole new class of rules that can work across files and even modules, allowing to run rules that do things more like a static analyzer would.

[marcelofabri]

Closing this since we removed this rule.