Shared-kind typarams shouldn't be copyable

[brson]

Because ~resource is shared kind it is not safe to copy shared kinds for which we don't know the type. This means that the ty param @T must not be copied. On first blush this seems quite restrictive since shared boxes may not be used as ty params when they need to be copied.

[brson]

This also seems to imply that fn <@T> can't do vector addition or append on [T]:

// compile-fail/unique-vec-res.rs
resource r(i: @mutable int) {
    *i = *i + 1;
}

fn f<@T>(i: [T], j: [T]) {
    // Shouldn't be able to do this copy of j
    let k = i + j;
}

fn main() {
    let i1 = @mutable 0;
    let i2 = @mutable 1;
    let r1 <- [~r(i1)];
    let r2 <- [~r(i2)];
    f(r1, r2);
    log_err *i1;
    log_err *i2;                                                                                                                                                              
}

[brson]

This isn't actually required until #977 is implemented

[marijnh]

This is handled/superseded by the new kind system (#1177).