nitc :: MClass :: is_pure_extender
# pure extenders contain only introductions
private fun is_pure_extender(filter: ModelFilter): Bool do
var rdfs = collect_redef_mproperties(filter).length
var locs = collect_local_mproperties(filter).length
if rdfs == 0 and locs > 0 then return true
return false
end
src/metrics/mendel_metrics.nit:301,2--307,4