More nits

Author: compiler-errors

compiler/rustc_ast_lowering/src/lib.rs

@@ -177,7 +177,8 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
             } else {
                 [sym::gen_future].into()
             },
-            // FIXME(gen_blocks): how does `closure_track_caller`
+            // FIXME(gen_blocks): how does `closure_track_caller`/`async_fn_track_caller`
+            // interact with `gen`/`async gen` blocks
             allow_async_iterator: [sym::gen_future, sym::async_iterator].into(),
             generics_def_id_map: Default::default(),
             host_param_id: None,

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

@@ -3144,10 +3144,9 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
                 let what = match self.tcx.coroutine_kind(coroutine_def_id) {
                     None
                     | Some(hir::CoroutineKind::Coroutine)
-                    | Some(hir::CoroutineKind::Gen(_))
-                    // FIXME(gen_blocks): This could be yield or await...
-                    | Some(hir::CoroutineKind::AsyncGen(_)) => "yield",
+                    | Some(hir::CoroutineKind::Gen(_)) => "yield",
                     Some(hir::CoroutineKind::Async(..)) => "await",
+                    Some(hir::CoroutineKind::AsyncGen(_)) => "yield`/`await",
                 };
                 err.note(format!(
                     "all values live across `{what}` must have a statically known size"