Unexpectied panic 'box_free language item is missing'

[Lundbrik]

Running rustc 1.8.0-nightly (3623797eb 2016-02-07) while trying to compile Redox

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
thread 'rustc' panicked at 'box_free language item is missing', ../src/libcore/option.rs:704
stack backtrace:
   1:     0x7fd35d13c850 - sys::backtrace::tracing::imp::write::he15d7b3364c6e91ettu
   2:     0x7fd35d1443bb - panicking::default_handler::_$u7b$$u7b$closure$u7d$$u7d$::closure.43190
   3:     0x7fd35d143f13 - panicking::default_handler::hd4b9dd3c40d2e5f3fWy
   4:     0x7fd35d10ddfc - sys_common::unwind::begin_unwind_inner::h63382e2c0ae54a7diit
   5:     0x7fd35d10e898 - sys_common::unwind::begin_unwind_fmt::h0a6a5420714a72c0oht
   6:     0x7fd35d13a351 - rust_begin_unwind
   7:     0x7fd35d18adbf - panicking::panic_fmt::h1951bd5aee0da5596YL
   8:     0x7fd35d1aa8c4 - option::expect_failed::h9cc346d7ce275f32ftO
   9:     0x7fd35b323e1a - build::scope::Builder<'a, 'tcx>::diverge_cleanup::h5ea749b11c66ba65Had
  10:     0x7fd35b302b80 - build::scope::Builder<'a, 'tcx>::pop_scope::h7568796be110735ff0c
  11:     0x7fd35b31df14 - build::expr::into::Builder<'a, 'tcx>::into_expr::h7a0c025e98fb02bc57a
  12:     0x7fd35b31811c - build::expr::as_rvalue::Builder<'a, 'tcx>::expr_as_rvalue::_$u7b$$u7b$closure$u7d$$u7d$::closure.19089
  13:     0x7fd35b30f59d - build::expr::as_rvalue::Builder<'a, 'tcx>::expr_as_rvalue::h369a28f5cfcac23foCa
  14:     0x7fd35b31d723 - build::expr::into::Builder<'a, 'tcx>::into_expr::h7a0c025e98fb02bc57a
  15:     0x7fd35b3062ae - build::into::ExprRef<'tcx>.EvalInto<'tcx>::eval_into::h374a28606d32aa0f9pb
  16:     0x7fd35b31df03 - build::expr::into::Builder<'a, 'tcx>::into_expr::h7a0c025e98fb02bc57a
  17:     0x7fd35b3062ae - build::into::ExprRef<'tcx>.EvalInto<'tcx>::eval_into::h374a28606d32aa0f9pb
  18:     0x7fd35b303ca9 - build::block::Builder<'a, 'tcx>::ast_block::hd0f0337c8ad9f41aCka
  19:     0x7fd35b2ff628 - build::construct::h90612f4a0cd2dacadca
  20:     0x7fd35b34955e - mir_map::InnerDump<'a, 'm, 'tcx>.Visitor<'tcx>::visit_fn::h33270291c27d9d1bnqg
  21:     0x7fd35b350e67 - mir_map::OuterDump<'a, 'tcx>.Visitor<'tcx>::visit_impl_item::h42dd307c5851c990Pog
  22:     0x7fd35b3479a1 - mir_map::OuterDump<'a, 'tcx>.Visitor<'tcx>::visit_item::h4fe9ad6dd68a9befyng
  23:     0x7fd35b3469eb - mir_map::build_mir_for_crate::h560c842fe7acd737Ilg
  24:     0x7fd35d6548bf - driver::phase_3_run_analysis_passes::_$u7b$$u7b$closure$u7d$$u7d$::closure.27872
  25:     0x7fd35d6507ae - middle::ty::context::ctxt<'tcx>::create_and_enter::h11600905232178369135
  26:     0x7fd35d64c903 - driver::phase_3_run_analysis_passes::h18126472581767654397
  27:     0x7fd35d620038 - driver::compile_input::hfa329d5d8fe427ccBca
  28:     0x7fd35d6103b8 - run_compiler::hdaf245d1b59a9fc0QGc
  29:     0x7fd35d60d8a1 - sys_common::unwind::try::try_fn::h5118579457423020331
  30:     0x7fd35d13a2db - __rust_try
  31:     0x7fd35d13281d - sys_common::unwind::inner_try::hc860e6d6d8228b31kft
  32:     0x7fd35d60e0f0 - boxed::F.FnBox<A>::call_box::h9365687296754034372
  33:     0x7fd35d142980 - sys::thread::Thread::new::thread_start::h40f537715d102aa8zTx
  34:     0x7fd35594a4a3 - start_thread
  35:     0x7fd35cdc313c - clone
  36:                0x0 - <unknown>

``

[jonas-schievink]

Like I said in #31480, this is happening because Redox doesn't define the box_free lang item, which was introduced in #31307. Of course, the error message could be better, but that's basically covered by #9307.

[Lundbrik]

Thanks for the information. Figured it might be Redox, just wanted to reoort it since it so nicely asked for it.