change HIR typeck unification handling approach

compiler/rustc_trait_selection/src/solve/fulfill.rs

@@ -252,7 +252,9 @@ where
                         // inside of an opaque type, e.g. if there's `Opaque = (?x, ?x)` in the
                         // storage, we can also rely on structural identity of `?x` even if we
                         // later uniquify it in MIR borrowck.
-                        if infcx.in_hir_typeck && obligation.has_non_region_infer() {
+                        if infcx.in_hir_typeck
+                            && (obligation.has_non_region_infer() || obligation.has_free_regions())
+                        {
                             infcx.push_hir_typeck_potentially_region_dependent_goal(obligation);
                         }
                     }