diff --git a/src/fields_parse.rs b/src/fields_parse.rs index 25c42dae..440b45e5 100644 --- a/src/fields_parse.rs +++ b/src/fields_parse.rs @@ -71,8 +71,9 @@ fn create_parser<'a>( count_args: usize, ) -> quote::__private::TokenStream { let function_to_parse = match parser_type { - ParserType::Default => match types.next() { - Some(ty) => { + ParserType::Default => match count_args { + 1 => { + let ty = types.next().expect("count_args != types.len()"); quote! { (|s: String| { let res = <#ty>::from_str(&s) .map_err(|e|ParseError::IncorrectFormat({ let e: Box<dyn std::error::Error + Send + Sync + 'static> = e.into(); e }))?; @@ -80,7 +81,7 @@ fn create_parser<'a>( }) } } - None => quote! { compile_error!("Expected 1 argument") }, + _ => quote! { compile_error!("Expected exactly 1 argument") }, }, ParserType::Split { separator } => parser_with_separator( &separator.clone().unwrap_or_else(|| " ".to_owned()),