[FIXME] squash with previous commit if this is correct.

Author: zachs18

compiler/rustc_next_trait_solver/src/solve/assembly/mod.rs

@@ -788,11 +788,6 @@ where
         candidates: &mut Vec<Candidate<I>>,
     ) {
         let cx = self.cx();
-        if cx.is_sizedness_trait(goal.predicate.trait_def_id(cx)) {
-            // `dyn MetaSized` is valid, but should get its `MetaSized` impl from being `dyn`.
-            tracing::info!("FIXME: try removing this");
-            return;
-        }
 
         let self_ty = goal.predicate.self_ty();
         let bounds = match self_ty.kind() {

compiler/rustc_trait_selection/src/traits/select/candidate_assembly.rs

@@ -904,11 +904,6 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
             "assemble_candidates_from_object_ty",
         );
 
-        if self.tcx().is_sizedness_trait(obligation.predicate.def_id()) {
-            tracing::info!("FIXME: try removing this");
-            return;
-        }
-
         self.infcx.probe(|_snapshot| {
             let poly_trait_predicate = self.infcx.resolve_vars_if_possible(obligation.predicate);
             self.infcx.enter_forall(poly_trait_predicate, |placeholder_trait_predicate| {