reworded message

compiler/rustc_resolve/src/late/diagnostics.rs

@@ -1674,10 +1674,14 @@ impl<'tcx> LifetimeContext<'_, 'tcx> {
                         );
                     } else if suggest_note {
                         suggest_note = false; // Avoid displaying the same help multiple times.
-                        err.help(&format!(
-                            "consider introducing lifetime `{}` to the item's generics",
-                            lifetime_ref,
-                        ));
+                        err.span_label(
+                            span,
+                            &format!(
+                                "lifetime `{}` is missing in item created through this procedural \
+                                 macro",
+                                lifetime_ref,
+                            ),
+                        );
                     }
                 }
                 MissingLifetimeSpot::HigherRanked { span, span_type } => {

src/test/ui/lifetimes/undeclared-lifetime-used-in-debug-macro-issue-70152.stderr

@@ -27,10 +27,12 @@ LL |     a: &'b str,
 error[E0261]: use of undeclared lifetime name `'b`
   --> $DIR/undeclared-lifetime-used-in-debug-macro-issue-70152.rs:3:9
    |
+LL | #[derive(Eq, PartialEq)]
+   |          -- lifetime `'b` is missing in item created through this procedural macro
+LL | struct Test {
 LL |     a: &'b str,
    |         ^^ undeclared lifetime
    |
-   = help: consider introducing lifetime `'b` to the item's generics
    = help: if you want to experiment with in-band lifetime bindings, add `#![feature(in_band_lifetimes)]` to the crate attributes
 
 error: aborting due to 3 previous errors