removed 9999 from errors

Author: Kivooeo

compiler/rustc_error_codes/src/lib.rs

@@ -547,7 +547,6 @@ E0801: 0801,
 E0802: 0802,
 E0803: 0803,
 E0804: 0804,
-E9999: 9999,
         );
     )
 }