message: elle.clonable: kill warnings
  backslash at end of file
  useless virtual with override
diff: @@ -17,10 +17,9 @@ namespace elle
  }
  #define ELLE_CLONABLE() \
  - virtual \
  std::unique_ptr<typename Self::_elle_Cloned> \
  clone() const override \
  { \
  return \
  std::unique_ptr<typename Self::_elle_Cloned>(new Self(*this)); \
  - } \
  + }
  