78         Fields::Unit => return Err(Error::new_spanned(item, "unit structs are not supported")),  in parse_struct()
80             return Err(Error::new_spanned(item, "tuple structs are not supported"));  in parse_struct()
285             return Err(Error::new_spanned(variant, msg));  in parse_variant()
296         Err(err) => return Err(Error::new_spanned(variant, err)),  in parse_variant()
413             return Err(Error::new_spanned(  in parse_lang()
423         _ => Err(Error::new_spanned(  in parse_lang()
516         return Err(Error::new_spanned(  in parse_extern_fn()
523         return Err(Error::new_spanned(  in parse_extern_fn()
530         return Err(Error::new_spanned(  in parse_extern_fn()
537         return Err(Error::new_spanned(  in parse_extern_fn()
544         return Err(Error::new_spanned(  in parse_extern_fn()
570                 return Err(Error::new_spanned(arg, "unsupported signature"));  in parse_extern_fn()
578                     _ => return Err(Error::new_spanned(arg, "unsupported signature")),  in parse_extern_fn()
614                 return Err(Error::new_spanned(arg, "unsupported method receiver"));  in parse_extern_fn()
672             Err(Error::new_spanned(  in parse_extern_verbatim()
788         return Err(Error::new_spanned(span, msg));  in parse_type_alias()
899         return Err(Error::new_spanned(span, "expected an empty impl block"));  in parse_impl()
905         return Err(Error::new_spanned(  in parse_impl()
912         return Err(Error::new_spanned(  in parse_impl()
933                 return Err(Error::new_spanned(  in parse_impl()
1043         _ => Err(Error::new_spanned(ty, "unsupported type")),  in parse_type()
1073                 return Err(Error::new_spanned(ty, "unsupported type"));  in parse_type_reference()
1217     Err(Error::new_spanned(ty, "unsupported type"))  in parse_type_path()
1227         return Err(Error::new_spanned(&ty.len, msg));  in parse_type_array()
1234         return Err(Error::new_spanned(len_expr, msg));  in parse_type_array()
1240         return Err(Error::new_spanned(ty, msg));  in parse_type_array()
1257         return Err(Error::new_spanned(  in parse_type_fn()
1264         return Err(Error::new_spanned(  in parse_type_fn()