ICE: Unexpected tail in unsized_info_ty

[aka-demik]

ICE when define unused and unsized enum in unused struct. Tested on 1.12, Beta, Nightly.

Code (playground):

#![allow(dead_code)]
#[derive(Debug)]
enum E { V1([u8]) }
struct S { e: E }
fn main() {}

Output:

error: internal compiler error: ../src/librustc_trans\type_of.rs:180: Unexpected tail in unsized_info_ty: E for ty=E 

Meta

rustc --version --verbose:

rustc 1.12.0 (3191fbae9 2016-09-23)
binary: rustc
commit-hash: 3191fbae9da539442351f883bdabcad0d72efcb6
commit-date: 2016-09-23
host: i686-pc-windows-gnu
release: 1.12.0 

Backtrace from play.rust-lang.org (on windows backtrace is useless):

thread 'rustc' panicked at 'Box<Any>', ../src/librustc_errors/lib.rs:634
stack backtrace:
   1:     0x7fcf698dfd99 - std::sys::backtrace::tracing::imp::write::h00e948915d1e4c72
   2:     0x7fcf698f05dc - std::panicking::default_hook::_{{closure}}::h7b8a142818383fb8
   3:     0x7fcf698ee9d4 - std::panicking::default_hook::h41cf296f654245d7
   4:     0x7fcf698ef138 - std::panicking::rust_panic_with_hook::h4cbd7ca63ce1aee9
   5:     0x7fcf630c8ac7 - std::panicking::begin_panic::hd3e81d866d6c5b0a
   6:     0x7fcf630d96a5 - rustc_errors::Handler::bug::h60f29cdeff67c1a3
   7:     0x7fcf66b50054 - rustc::session::opt_span_bug_fmt::_{{closure}}::ha1319a72e07cd73b
   8:     0x7fcf66a91545 - rustc::session::opt_span_bug_fmt::h4badbc71bfeea6f9
   9:     0x7fcf66a91382 - rustc::session::bug_fmt::he780dcb9e1e8a7d5
  10:     0x7fcf68a986c9 - rustc_trans::type_of::unsized_info_ty::hf5272e7847c33a65
  11:     0x7fcf68a990c6 - rustc_trans::type_of::in_memory_type_of::hdd81758adcc42cd9
  12:     0x7fcf68aac0b6 - rustc_trans::abi::FnType::unadjusted::_{{closure}}::ha426c6eba79ff534
  13:     0x7fcf689a9fc1 - rustc_trans::abi::FnType::unadjusted::h9ba1517948e929af
  14:     0x7fcf68a2a219 - rustc_trans::declare::declare_fn::hcf17f99041b59a03
  15:     0x7fcf68a8e190 - rustc_trans::trans_item::TransItem::predefine::h2c5f61d2b590ea2f
  16:     0x7fcf689cb1f1 - rustc_trans::base::trans_crate::h37725bf3707576ff
  17:     0x7fcf69ca44dd - rustc_driver::driver::phase_4_translate_to_llvm::hf2ea1af0ff14ef82
  18:     0x7fcf69ce5c17 - rustc_driver::driver::compile_input::_{{closure}}::he0f41e0761e5765b
  19:     0x7fcf69cd857c - rustc_driver::driver::phase_3_run_analysis_passes::_{{closure}}::he5bb0058670d90b6
  20:     0x7fcf69c25158 - rustc::ty::context::TyCtxt::create_and_enter::h1ad8faffb62f0367
  21:     0x7fcf69c8d81f - rustc_driver::driver::compile_input::h4d6bc655b7baad10
  22:     0x7fcf69cba776 - rustc_driver::run_compiler::h9165e61fc2dd486f
  23:     0x7fcf69c016e2 - std::panicking::try::do_call::hc52dd3bdae996640
  24:     0x7fcf698fe746 - __rust_maybe_catch_panic
  25:     0x7fcf69c1ad7a - _<F as alloc..boxed..FnBox<A>>::call_box::h3aad53cfb9d2713a
  26:     0x7fcf698ecd32 - std::sys::thread::Thread::new::thread_start::h4c0ad33b336bc6ea
  27:     0x7fcf628706f9 - start_thread
  28:     0x7fcf69530b5c - clone
  29:                0x0 - <unknown>

[TimNN]

Duplicate of #16812, I think.