Add "this has type {} which {}" note

compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs

@@ -1630,6 +1630,10 @@ impl<'a, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'a, 'tcx> {
                             ),
                         );
                         err.span_note(scope_span, &format!("{} is later dropped here", snippet));
+                        err.span_note(
+                            interior_span,
+                            &format!("this has type `{}` which {}", target_ty, trait_explanation),
+                        );
                     } else {
                         span.push_span_label(
                             yield_span,

src/test/ui/async-await/issue-70935-complex-spans.stderr

@@ -17,6 +17,14 @@ note: the value is later dropped here
    |
 LL |         }).await;
    |                 ^
+note: this has type `[closure@$DIR/issue-70935-complex-spans.rs:13:13: 15:10]` which is not `Send`
+  --> $DIR/issue-70935-complex-spans.rs:13:13
+   |
+LL |           baz(|| async{
+   |  _____________^
+LL | |             foo(tx.clone());
+LL | |         }).await;
+   | |_________^
 
 error: aborting due to previous error
 

src/test/ui/async-await/issues/issue-65436-raw-ptr-not-send.stderr

@@ -18,6 +18,11 @@ note: `std::ptr::null()` is later dropped here
    |
 LL |         bar(Foo(std::ptr::null())).await;
    |                                         ^
+note: this has type `*const u8` which is not `Send`
+  --> $DIR/issue-65436-raw-ptr-not-send.rs:14:17
+   |
+LL |         bar(Foo(std::ptr::null())).await;
+   |                 ^^^^^^^^^^^^^^^^
 help: consider moving this into a `let` binding to create a shorter lived borrow
   --> $DIR/issue-65436-raw-ptr-not-send.rs:14:13
    |