This kind includes scalars, owning pointers, owned closures, and
structural types containing only other owned types.
All `Send` types are `'static`.
+`Pod`
+ : Types of this kind consist of "Plain Old Data"
+ which can be copied by simply moving bits.
+ All values of this kind can be implicitly copied.
+ This kind includes scalars and immutable references,
+ as well as structural types containing other `Pod` types.
`'static`
: Types of this kind do not contain any borrowed pointers;
this can be a useful guarantee for code