'shown-features', except on a module with no show — where TShownFeatures is never and this collapses to never, making 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— whereTShownFeaturesisneverand this collapses tonever, making the overload uncallable. Without it a handler could be registered for an event the module can never emit.