refactor(error_report): remove dead code

src/meta_commands.rs

@@ -14,18 +14,3 @@ impl MetaCommand {
         }
     }
 }
-
-#[derive(Debug)]
-pub enum MetaCommandParseError {
-    Unrecognized { cmd: String },
-}
-
-impl std::fmt::Display for MetaCommandParseError {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        match self {
-            MetaCommandParseError::Unrecognized { cmd } => {
-                write!(f, "unrecognized meta-command {cmd:?}")
-            }
-        }
-    }
-}