We could be smarter about implementing Copy/Clone

[emilio]

Testcase:

template<typename T>
struct Foo {
    char bar[50];
};

vs.

struct Foo {
    char bar[50];
};

We're conservative here, but we could be smarter if we know the struct has no template parameters, since all the arrays (even the big ones) implement magically Copy, so we can do:

impl Clone for MyStruct { fn clone(&self) -> Self { *self } }

But this wouldn't work for templated structs, where we derive it.

[WiSaGaN]

Struct like struct Foo { char bar[81]; }; used to have Copy derived with Clone manually implemented using Copy described in the OP. This is at least true in bindgen 0.16. This is blocking me to upgrade bindgen...