Fix error message

Author: long-long-float

compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs

@@ -1053,7 +1053,6 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             .peek()
             .is_some_and(|first| matches!(first, Error::Extra(arg_idx) if arg_idx.index() == 0));
         let mut suggestions = vec![];
-
         while let Some(error) = errors.next() {
             only_extras_so_far &= matches!(error, Error::Extra(_));
 
@@ -1095,14 +1094,14 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     } else {
                         "".to_string()
                     };
-                    let ord = if provided_arg_tys.len() == 1 {
+                    let idx = if provided_arg_tys.len() == 1 {
                         "".to_string()
                     } else {
-                        format!("#{} ", arg_idx.as_usize() + 1)
+                        format!(" #{}", arg_idx.as_usize() + 1)
                     };
                     labels.push((
                         provided_span,
-                        format!("unexpected {ord}argument{provided_ty_name}"),
+                        format!("unexpected argument{idx}{provided_ty_name}"),
                     ));
                     let mut span = provided_span;
                     if span.can_be_used_for_suggestions()
@@ -1184,12 +1183,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                             } else {
                                 "".to_string()
                             };
-                            let ord = if formal_and_expected_inputs.len() == 1 {
-                                "an".to_string()
-                            } else {
-                                format!("#{}", expected_idx.as_usize() + 1)
-                            };
-                            labels.push((span, format!("{ord} argument{rendered} is missing")));
+                            labels.push((span, format!("argument #{}{rendered} is missing", expected_idx.as_usize() + 1)));
 
                             suggestion_text = match suggestion_text {
                                 SuggestionText::None => SuggestionText::Provide(false),