error: unconstrained generic constant
  --> $DIR/different-fn.rs:10:9
   |
LL |     [0; size_of::<Foo<T>>()]
   |         ^^^^^^^^^^^^^^^^^^^
   |
help: consider adding a `where` bound for this expression
  --> $DIR/different-fn.rs:10:9
   |
LL |     [0; size_of::<Foo<T>>()]
   |         ^^^^^^^^^^^^^^^^^^^

error: aborting due to previous error