// FIXME: make this a simple by-ref for loop once external_traits is cleaned up
let external_traits = { std::mem::take(&mut *c.external_traits.borrow_mut()) };
for (k, v) in external_traits {
// FIXME: make this a simple by-ref for loop once external_traits is cleaned up
let external_traits = { std::mem::take(&mut *c.external_traits.borrow_mut()) };
for (k, v) in external_traits {