ICE when passing large fixed-size array as T:Clone via T:Copy

[pnkfelix]

Spawned off of #24000

fn main() {
    let x = [5; 100];
    foo(x);
}

fn foo<X: Copy>(x: X) { let _ = bar(x); }

fn bar<X:Clone>(x: X) { let _ = x.clone(); }

causes this ICE:

<anon>:8:33: 8:42 error: internal compiler error: Encountered error `Unimplemented` selecting `Binder(core::clone::Clone)` during trans
<anon>:8 fn bar<X:Clone>(x: X) { let _ = x.clone(); }
                                         ^~~~~~~~~
note: the compiler unexpectedly panicked. this is a bug.

[steveklabnik]

Triage: still ICEs

[steveklabnik]

Looks like this is fixed:

C:\Users\steve\tmp> rustc +nightly foo.rs
C:\Users\steve\tmp> rustc --version
rustc 1.21.0-nightly (469a6f9bd 2017-08-22)