prefer unimplemented! for unimplemented functions

src/commands/audio_output_devices/outputs.rs

@@ -31,8 +31,6 @@ impl Command for Outputs {
     fn parse_response(
         parts: ResponseAttributes<'_>,
     ) -> Result<Self::Response, ResponseParserError> {
-        todo!()
-        // debug_assert!(parts.is_empty());
-        // Ok(())
+        unimplemented!()
     }
 }

src/commands/playback_options/getvol.rs

@@ -17,7 +17,7 @@ impl Command for GetVol {
     fn parse_response(
         parts: ResponseAttributes<'_>,
     ) -> Result<Self::Response, ResponseParserError> {
-        todo!()
+        unimplemented!()
         // let volume = get_property!(parts, Volume, "volume");
         // let volume = match parts.get("volume") {
         //     Some(GenericResponseValue::Volume(v)) => *v,

src/commands/querying_mpd_status/currentsong.rs

@@ -22,6 +22,6 @@ impl Command for CurrentSong {
     fn parse_response(
         parts: ResponseAttributes<'_>,
     ) -> Result<Self::Response, ResponseParserError> {
-        todo!()
+        unimplemented!()
     }
 }