Emitting error regardless of new param suggestion

Author: Stoozy

compiler/rustc_resolve/src/late/lifetimes.rs

@@ -1319,48 +1319,48 @@ impl<'a, 'tcx> LifetimeContext<'a, 'tcx> {
                         && !self.tcx.features().anonymous_lifetime_in_impl_trait
                     {
 
+
+                        let mut diag =  rustc_session::parse::feature_err(
+                            &self.tcx.sess.parse_sess,
+                            sym::anonymous_lifetime_in_impl_trait,
+                            lifetime_ref.span,
+                            "anonymous lifetimes in `impl Trait` are unstable",
+                        );
+
                         match self.tcx.hir().get_generics(lifetime_ref.hir_id.owner.def_id) {
                             Some(generics) => {
-                                for i in 0..generics.params.len()  {
 
-                                    if !generics.span.contains(generics.params[i].span)  {
+                                let mut new_param_sugg_tuple = None;
 
-                                        let mut diag =  rustc_session::parse::feature_err(
-                                            &self.tcx.sess.parse_sess,
-                                            sym::anonymous_lifetime_in_impl_trait,
-                                            lifetime_ref.span,
-                                            "anonymous lifetimes in `impl Trait` are unstable",
-                                        );
-
-                                        diag.span_label(lifetime_ref.span, "expected named lifetime parameter");
-                                        diag.multipart_suggestion("consider introducing a named lifetime parameter",
-                                                                  vec![
-                                                                    (lifetime_ref.span.shrink_to_hi(), "'a ".to_owned()),
-                                                                    match generics.span_for_param_suggestion() {
-                                                                        Some(_) => {
-                                                                            (self.tcx.sess.source_map().span_through_char(generics.span, '<').shrink_to_hi(), "'a, ".to_owned())
-                                                                        }
-                                                                        None => (generics.span, "<'a>".to_owned()),
-
-                                                                    }
-                                                                  ], rustc_errors::Applicability::MaybeIncorrect);
-                                        diag.emit();
-
-                                        return;
+                                for i in 0..generics.params.len()  {
+                                    if !generics.span.contains(generics.params[i].span)  {
+                                        new_param_sugg_tuple = match generics.span_for_param_suggestion() {
+                                            Some(_) => {
+                                                Some((self.tcx.sess.source_map().span_through_char(generics.span, '<').shrink_to_hi(), "'a, ".to_owned()))
+                                            },
+                                            None => Some((generics.span, "<'a>".to_owned()))
+                                        }
                                     }
                                 }
+
+                                let mut multi_sugg_vec = vec![(lifetime_ref.span.shrink_to_hi(), "'a ".to_owned())];
+
+                                if let Some(new_tuple) =  new_param_sugg_tuple{
+                                    multi_sugg_vec.push(new_tuple);
+                                }
+
+                                diag.span_label(lifetime_ref.span, "expected named lifetime parameter");
+                                diag.multipart_suggestion("consider introducing a named lifetime parameter",
+                                multi_sugg_vec,
+                                rustc_errors::Applicability::MaybeIncorrect);
+
                             },
-                            None => {
-                                rustc_session::parse::feature_err(
-                                    &self.tcx.sess.parse_sess,
-                                    sym::anonymous_lifetime_in_impl_trait,
-                                    lifetime_ref.span,
-                                    "anonymous lifetimes in `impl Trait` are unstable",
-                                ).emit();
-                                return;
-                            }
+                            None => { continue; }
                         }
 
+                        diag.emit();
+                        return;
+
                     }
                     scope = s;
                 }