https://doc.rust-lang.org/std/boxed/index.html:
So long as T: Sized, a Box<T> is guaranteed to be represented as a
single pointer and is also ABI-compatible with C pointers (i.e. the C
type T*).
Clang-format doesn't always like the same ending comment as the start of
the block. In particular it wants:
inline namespace cxxbridge01 {
...
} // namespace cxxbridge01
This avoids collision with the user's namespaces having the same name.
Less important in the context of the current names right now, but more
important after we move our public C++ API from cxxbridge:: to rust::.
In fact our example code already uses org::rust:: as the namespace,
inside of which a non-absolute rust:: would cause trouble.
