Directly use Option<&[T]> instead of converting from Option<&Vec<T>> later on

compiler/rustc_resolve/src/late/lifetimes.rs

@@ -2422,7 +2422,7 @@ fn resolve_elided_lifetimes(&mut self, lifetime_refs: Vec<&'tcx hir::Lifetime>)
                                     _ => break,
                                 }
                             }
-                            break Some(e);
+                            break Some(&e[..]);
                         }
                         Elide::Forbid => break None,
                     };
@@ -2452,7 +2452,7 @@ fn resolve_elided_lifetimes(&mut self, lifetime_refs: Vec<&'tcx hir::Lifetime>)
             lifetime_refs.len(),
             &lifetime_names,
             lifetime_spans,
-            error.map(|p| &p[..]).unwrap_or(&[]),
+            error.unwrap_or(&[]),
         );
         err.emit();
     }