'shown-features', except on a module with no show. There TShownFeatures is never, so this collapses to never and makes the overload uncallable. Without it, a handler could be registered for an event the module can never emit.
'shown-features'
show
TShownFeatures
never
'shown-features', except on a module with noshow. ThereTShownFeaturesisnever, so this collapses toneverand makes the overload uncallable. Without it, a handler could be registered for an event the module can never emit.