Add a FIXME

compiler/rustc_mir_transform/src/coroutine/by_move_body.rs

@@ -233,6 +233,7 @@ fn run_pass(&self, tcx: TyCtxt<'tcx>, body: &mut mir::Body<'tcx>) {
         let mut by_move_body = body.clone();
         MakeByMoveBody { tcx, field_remapping, by_move_coroutine_ty }.visit_body(&mut by_move_body);
         dump_mir(tcx, false, "coroutine_by_move", &0, &by_move_body, |_, _| Ok(()));
+        // FIXME: use query feeding to generate the body right here and then only store the `DefId` of the new body.
         by_move_body.source = mir::MirSource::from_instance(InstanceDef::CoroutineKindShim {
             coroutine_def_id: coroutine_def_id.to_def_id(),
         });