killme

warning: field is never used: `private`
 --> /home/nmatsakis/tmp/foo.rs:6:5
  |
6 |     private: std::num::NonZeroU32,
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  |
  = note: #[warn(dead_code)] on by default

warning: function is never used: `main`
  --> /home/nmatsakis/tmp/foo.rs:36:1
   |
36 | fn main() { }
   | ^^^^^^^^^

thread 'main' panicked at 'assertion failed: `(left == right)`
  left: `18446744073709551615`,
 right: `340282366920938463463374607431768211455`', librustc_codegen_llvm/debuginfo/metadata.rs:1367:29
stack backtrace:
   0: std::sys::unix::backtrace::tracing::imp::unwind_backtrace
             at libstd/sys/unix/backtrace/tracing/gcc_s.rs:49
   1: std::sys_common::backtrace::_print
             at libstd/sys_common/backtrace.rs:71
   2: std::panicking::default_hook::{{closure}}
             at libstd/sys_common/backtrace.rs:59
             at libstd/panicking.rs:211
   3: std::panicking::default_hook
             at libstd/panicking.rs:227
   4: rustc::util::common::panic_hook
   5: std::panicking::rust_panic_with_hook
             at libstd/panicking.rs:480
   6: std::panicking::continue_panic_fmt
             at libstd/panicking.rs:390
   7: std::panicking::begin_panic_fmt
             at libstd/panicking.rs:345
   8: <core::iter::Map<I, F> as core::iter::iterator::Iterator>::fold
   9: <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T, I>>::from_iter
  10: rustc_codegen_llvm::debuginfo::metadata::MemberDescriptionFactory::create_member_descriptions
  11: rustc_codegen_llvm::debuginfo::metadata::RecursiveTypeDescription::finalize
  12: rustc_codegen_llvm::debuginfo::metadata::type_metadata
  13: rustc_codegen_llvm::mir::codegen_mir
  14: rustc_codegen_llvm::base::codegen_instance
  15: rustc_codegen_llvm::mono_item::MonoItemExt::define
  16: rustc_codegen_llvm::base::compile_codegen_unit::module_codegen
  17: rustc::dep_graph::graph::DepGraph::with_task
  18: rustc_codegen_llvm::base::codegen_crate
  19: <rustc_codegen_llvm::LlvmCodegenBackend as rustc_codegen_utils::codegen_backend::CodegenBackend>::codegen_crate
  20: rustc::util::common::time
  21: rustc_driver::driver::phase_4_codegen
  22: rustc_driver::driver::compile_input::{{closure}}
  23: rustc::ty::context::tls::enter_context
  24: <std::thread::local::LocalKey<T>>::with
  25: rustc::ty::context::TyCtxt::create_and_enter
  26: rustc_driver::driver::compile_input
  27: rustc_driver::run_compiler_with_pool
  28: rustc_driver::driver::spawn_thread_pool
  29: rustc_driver::run_compiler
  30: <scoped_tls::ScopedKey<T>>::set
  31: syntax::with_globals
  32: __rust_maybe_catch_panic
             at libpanic_unwind/lib.rs:102
  33: rustc_driver::run
  34: rustc_driver::main
  35: std::rt::lang_start::{{closure}}
  36: std::panicking::try::do_call
             at libstd/rt.rs:59
             at libstd/panicking.rs:310
  37: __rust_maybe_catch_panic
             at libpanic_unwind/lib.rs:102
  38: std::rt::lang_start_internal
             at libstd/panicking.rs:289
             at libstd/panic.rs:392
             at libstd/rt.rs:58
  39: main
  40: __libc_start_main
             at ../csu/libc-start.c:308
  41: <unknown>
query stack during panic:
end of query stack

error: internal compiler error: unexpected panic

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: rustc 1.31.0-nightly (de9666f12 2018-10-31) running on x86_64-unknown-linux-gnu

note: compiler flags: -C debuginfo=2 --crate-type lib