core: primitive-load: Force top level.

* src/eval-apply.c (eval_apply): Force toplevel for primitive load.

src/eval-apply.c

@@ -806,6 +806,8 @@ begin:
             {
               program = cons (R1->car, cell_nil);
               push_cc (program, R1, R0, cell_vm_begin_primitive_load);
+              /* Force toplevel by moving any *closure* down.  */
+              R0 = cons (cell_undefined, R0);
               goto begin_expand;
             begin_primitive_load:
               R2->car = R1;