ICE using tuple containing a DST (1.14 stable & 1.16 nightly)

[scottmcm]

The following code produces an internal compiler error:

pub fn ice() -> Box<(u32, [u8])> {
    unimplemented!()
}

From playground:

rustc 1.16.0-nightly (bf6d7b665 2017-01-15)
error: internal compiler error: /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/librustc_trans/type_of.rs:118: size differs (rustc: 4, llvm: 24) for type `(u32, [u8])` / Univariant {
    variant: Struct {
        align: Align {
            raw: 50
        },
        packed: false,
        sized: false,
        offsets: [
            Size {
                raw: 0
            },
            Size {
                raw: 4
            }
        ],
        memory_index: [
            0,
            1
        ],
        min_size: Size {
            raw: 4
        }
    },
    non_zero: false
}

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports

note: run with `RUST_BACKTRACE=1` for a backtrace

thread 'rustc' panicked at 'Box<Any>', /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/librustc_errors/lib.rs:423
stack backtrace:
   1:     0x7f1bc941a6bc - std::sys::imp::backtrace::tracing::imp::write::h9c41d2f69e5caabf
                        at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/sys/unix/backtrace/tracing/gcc_s.rs:42
   2:     0x7f1bc9428afe - std::panicking::default_hook::{{closure}}::hcc803c8663cda123
                        at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:351
   3:     0x7f1bc94286a3 - std::panicking::default_hook::hd5bda4e453dfb4be
                        at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:361
   4:     0x7f1bc9428f9b - std::panicking::rust_panic_with_hook::hffbc74969c7b5d87
                        at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:555
   5:     0x7f1bc1a16a37 - std::panicking::begin_panic::he43dc5d9a599d346
   6:     0x7f1bc1a2c039 - rustc_errors::Handler::bug::h7088c6afc4a008fb
   7:     0x7f1bc674790a - rustc::session::opt_span_bug_fmt::{{closure}}::hfd034971cdf18ea9
   8:     0x7f1bc67473c5 - rustc::session::opt_span_bug_fmt::hc2cac313cb6d0020
   9:     0x7f1bc6747022 - rustc::session::bug_fmt::he01375c3004c5cfe
  10:     0x7f1bc8b588ab - rustc_trans::type_of::sizing_type_of::h4d7312d21836b0c7
  11:     0x7f1bc8ac3139 - rustc_trans::abi::FnType::unadjusted::h598b926ecccf5431
  12:     0x7f1bc8b19405 - rustc_trans::declare::declare_fn::h04a136a66996d898
  13:     0x7f1bc8b52f46 - rustc_trans::trans_item::TransItem::predefine::he9886853e5fcfedb
  14:     0x7f1bc8ad1f12 - rustc_trans::base::trans_crate::h496d157cb52a4b02
  15:     0x7f1bc97e20b0 - rustc_driver::driver::phase_4_translate_to_llvm::h106eb073675c3bee
  16:     0x7f1bc97b3e22 - rustc_driver::driver::compile_input::{{closure}}::heec508e3b0737586
  17:     0x7f1bc97d5541 - rustc_driver::driver::phase_3_run_analysis_passes::{{closure}}::haa13372f770e9055
  18:     0x7f1bc9733319 - rustc::ty::context::TyCtxt::create_and_enter::h6acd1d75709e85e8
  19:     0x7f1bc97b1dd0 - rustc_driver::driver::compile_input::h44853ffed84a12cb
  20:     0x7f1bc97f7034 - rustc_driver::run_compiler::hdc4bb0fcf7d0917a
  21:     0x7f1bc96fbc5b - std::panicking::try::do_call::h84a15e0d2b943318
  22:     0x7f1bc9431dda - __rust_maybe_catch_panic
                        at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  23:     0x7f1bc97259a2 - <F as alloc::boxed::FnBox<A>>::call_box::h61c78220cad685ea
  24:     0x7f1bc9427954 - std::sys::imp::thread::Thread::new::thread_start::h76badbf9b0ecaf58
                        at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/liballoc/boxed.rs:615
                        at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/sys_common/thread.rs:21
                        at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/sys/unix/thread.rs:84
  25:     0x7f1bc11c16b9 - start_thread
  26:     0x7f1bc90de82c - clone
  27:                0x0 - <unknown>

[est31]

Seems like a dupe of #34451

[brson]

Thanks for the report @scottmcm.

Closing in favor of the other.