bt

error: internal compiler error: src/librustc_codegen_llvm/context.rs:867: failed to get layout for `&Ref<u8, Obstack>`: the type `<Obstack as Arena>::Dyn` has an unknown layout

thread 'rustc' panicked at 'Box<Any>', src/librustc_errors/lib.rs:649:9
stack backtrace:
   0: backtrace::backtrace::libunwind::trace
             at /home/pnkfelix/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/libunwind.rs:88
   1: backtrace::backtrace::trace_unsynchronized
             at /home/pnkfelix/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/mod.rs:66
   2: std::sys_common::backtrace::_print
             at src/libstd/sys_common/backtrace.rs:47
   3: std::sys_common::backtrace::print
             at src/libstd/sys_common/backtrace.rs:36
   4: std::panicking::default_hook::{{closure}}
             at src/libstd/panicking.rs:200
   5: std::panicking::default_hook
             at src/libstd/panicking.rs:214
   6: <alloc::boxed::Box<F> as core::ops::function::Fn<A>>::call
             at /home/pnkfelix/Dev/Mozilla/rust.git/src/liballoc/boxed.rs:780
   7: rustc::util::common::panic_hook
             at src/librustc/util/common.rs:40
   8: std::panicking::rust_panic_with_hook
             at src/libstd/panicking.rs:481
   9: std::panicking::begin_panic
             at /home/pnkfelix/Dev/Mozilla/rust.git/src/libstd/panicking.rs:411
  10: rustc_errors::Handler::bug
             at src/librustc_errors/lib.rs:649
  11: rustc::util::bug::opt_span_bug_fmt::{{closure}}
             at src/librustc/util/bug.rs:36
  12: rustc::ty::context::tls::with_opt::{{closure}}
             at src/librustc/ty/context.rs:1994
  13: rustc::ty::context::tls::with_context_opt
             at src/librustc/ty/context.rs:1944
  14: rustc::ty::context::tls::with_opt
             at src/librustc/ty/context.rs:1994
  15: rustc::util::bug::opt_span_bug_fmt
             at src/librustc/util/bug.rs:32
  16: rustc::util::bug::bug_fmt
             at src/librustc/util/bug.rs:12
  17: <rustc_codegen_llvm::context::CodegenCx as rustc_target::abi::LayoutOf>::layout_of::{{closure}}
             at src/librustc_codegen_llvm/context.rs:867
  18: rustc_codegen_llvm::intrinsic::<impl rustc_codegen_ssa::traits::intrinsic::IntrinsicCallMethods for rustc_codegen_llvm::builder::Builder>::codegen_intrinsic_call
             at /home/pnkfelix/Dev/Mozilla/rust.git/src/libcore/macros.rs:0
  19: rustc_codegen_ssa::mir::block::<impl rustc_codegen_ssa::mir::FunctionCx<Bx>>::codegen_call_terminator
             at /home/pnkfelix/Dev/Mozilla/rust.git/src/librustc_codegen_ssa/mir/block.rs:666
  20: rustc_codegen_ssa::mir::block::<impl rustc_codegen_ssa::mir::FunctionCx<Bx>>::codegen_terminator
             at /home/pnkfelix/Dev/Mozilla/rust.git/src/librustc_codegen_ssa/mir/block.rs:872
  21: rustc_codegen_ssa::mir::block::<impl rustc_codegen_ssa::mir::FunctionCx<Bx>>::codegen_block
             at /home/pnkfelix/Dev/Mozilla/rust.git/src/librustc_codegen_ssa/mir/block.rs:805
  22: rustc_codegen_ssa::mir::codegen_mir
             at /home/pnkfelix/Dev/Mozilla/rust.git/src/librustc_codegen_ssa/mir/mod.rs:338
  23: rustc_codegen_ssa::base::codegen_instance
             at /home/pnkfelix/Dev/Mozilla/rust.git/src/librustc_codegen_ssa/base.rs:385
  24: <rustc::mir::mono::MonoItem as rustc_codegen_ssa::mono_item::MonoItemExt>::define
             at /home/pnkfelix/Dev/Mozilla/rust.git/src/librustc_codegen_ssa/mono_item.rs:40
  25: rustc_codegen_llvm::base::compile_codegen_unit::module_codegen
             at src/librustc_codegen_llvm/base.rs:143
  26: rustc::dep_graph::graph::DepGraph::with_task_impl
             at /home/pnkfelix/Dev/Mozilla/rust.git/src/librustc/dep_graph/graph.rs:333
  27: rustc::dep_graph::graph::DepGraph::with_task
             at /home/pnkfelix/Dev/Mozilla/rust.git/src/librustc/dep_graph/graph.rs:201
  28: rustc_codegen_llvm::base::compile_codegen_unit
             at src/librustc_codegen_llvm/base.rs:110
  29: <rustc_codegen_llvm::LlvmCodegenBackend as rustc_codegen_ssa::traits::backend::ExtraBackendMethods>::compile_codegen_unit
             at src/librustc_codegen_llvm/lib.rs:129
  30: rustc_codegen_ssa::base::codegen_crate
             at /home/pnkfelix/Dev/Mozilla/rust.git/src/librustc_codegen_ssa/base.rs:616
  31: <rustc_codegen_llvm::LlvmCodegenBackend as rustc_codegen_utils::codegen_backend::CodegenBackend>::codegen_crate
             at src/librustc_codegen_llvm/lib.rs:292
  32: rustc_interface::passes::start_codegen::{{closure}}
             at src/librustc_interface/passes.rs:1082
  33: rustc::util::common::time_ext
             at /home/pnkfelix/Dev/Mozilla/rust.git/src/librustc/util/common.rs:151
  34: rustc::util::common::time
             at /home/pnkfelix/Dev/Mozilla/rust.git/src/librustc/util/common.rs:145
  35: rustc_interface::passes::start_codegen
             at src/librustc_interface/passes.rs:1081
  36: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::ongoing_codegen::{{closure}}::{{closure}}
             at src/librustc_interface/queries.rs:255
  37: rustc_interface::passes::BoxedGlobalCtxt::enter::{{closure}}::{{closure}}
             at src/librustc_interface/passes.rs:803
  38: rustc::ty::context::tls::enter_global::{{closure}}
             at /home/pnkfelix/Dev/Mozilla/rust.git/src/librustc/ty/context.rs:1898
  39: rustc::ty::context::tls::enter_context::{{closure}}
             at /home/pnkfelix/Dev/Mozilla/rust.git/src/librustc/ty/context.rs:1866
  40: rustc::ty::context::tls::set_tlv
             at /home/pnkfelix/Dev/Mozilla/rust.git/src/librustc/ty/context.rs:1799
  41: rustc::ty::context::tls::enter_context
             at /home/pnkfelix/Dev/Mozilla/rust.git/src/librustc/ty/context.rs:1865
  42: rustc::ty::context::tls::enter_global
             at /home/pnkfelix/Dev/Mozilla/rust.git/src/librustc/ty/context.rs:1897
  43: rustc_interface::passes::BoxedGlobalCtxt::enter::{{closure}}
             at src/librustc_interface/passes.rs:803
  44: rustc_interface::passes::BoxedGlobalCtxt::access::{{closure}}
             at /home/pnkfelix/Dev/Mozilla/rust.git/<::rustc_data_structures::box_region::declare_box_region_type macros>:17
  45: rustc_interface::passes::create_global_ctxt::{{closure}}
             at src/librustc_interface/passes.rs:869
  46: alloc::boxed::<impl core::ops::generator::Generator for core::pin::Pin<alloc::boxed::Box<G>>>::resume
             at /home/pnkfelix/Dev/Mozilla/rust.git/src/liballoc/boxed.rs:917
  47: rustc_data_structures::box_region::PinnedGenerator<I,A,R>::access
             at /home/pnkfelix/Dev/Mozilla/rust.git/src/librustc_data_structures/box_region.rs:52
  48: rustc_interface::passes::BoxedGlobalCtxt::access
             at /home/pnkfelix/Dev/Mozilla/rust.git/<::rustc_data_structures::box_region::declare_box_region_type macros>:19
  49: rustc_interface::passes::BoxedGlobalCtxt::enter
             at src/librustc_interface/passes.rs:803
  50: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::ongoing_codegen::{{closure}}
             at src/librustc_interface/queries.rs:249
  51: rustc_interface::queries::Query<T>::compute
             at src/librustc_interface/queries.rs:40
  52: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::ongoing_codegen
             at src/librustc_interface/queries.rs:246
  53: rustc_driver::run_compiler::{{closure}}
             at src/librustc_driver/lib.rs:366
  54: rustc_interface::interface::run_compiler_in_existing_thread_pool
             at /home/pnkfelix/Dev/Mozilla/rust.git/src/librustc_interface/interface.rs:123
  55: rustc_interface::interface::run_compiler::{{closure}}
             at /home/pnkfelix/Dev/Mozilla/rust.git/src/librustc_interface/interface.rs:142
  56: rustc_interface::util::spawn_thread_pool::{{closure}}::{{closure}}::{{closure}}::{{closure}}
             at /home/pnkfelix/Dev/Mozilla/rust.git/src/librustc_interface/util.rs:192
  57: rustc::ty::context::tls::with_thread_locals::{{closure}}::{{closure}}
             at /home/pnkfelix/Dev/Mozilla/rust.git/src/librustc/ty/context.rs:1854
  58: std::thread::local::LocalKey<T>::try_with
             at /home/pnkfelix/Dev/Mozilla/rust.git/src/libstd/thread/local.rs:257
  59: std::thread::local::LocalKey<T>::with
             at /home/pnkfelix/Dev/Mozilla/rust.git/src/libstd/thread/local.rs:234
  60: rustc::ty::context::tls::with_thread_locals::{{closure}}
             at /home/pnkfelix/Dev/Mozilla/rust.git/src/librustc/ty/context.rs:1846
  61: std::thread::local::LocalKey<T>::try_with
             at /home/pnkfelix/Dev/Mozilla/rust.git/src/libstd/thread/local.rs:257
  62: std::thread::local::LocalKey<T>::with
             at /home/pnkfelix/Dev/Mozilla/rust.git/src/libstd/thread/local.rs:234
  63: rustc::ty::context::tls::with_thread_locals
             at /home/pnkfelix/Dev/Mozilla/rust.git/src/librustc/ty/context.rs:1838
  64: rustc_interface::util::spawn_thread_pool::{{closure}}::{{closure}}::{{closure}}
             at /home/pnkfelix/Dev/Mozilla/rust.git/src/librustc_interface/util.rs:192
  65: scoped_tls::ScopedKey<T>::set
             at /home/pnkfelix/.cargo/registry/src/github.com-1ecc6299db9ec823/scoped-tls-1.0.0/src/lib.rs:137
  66: rustc_interface::util::spawn_thread_pool::{{closure}}::{{closure}}
             at /home/pnkfelix/Dev/Mozilla/rust.git/src/librustc_interface/util.rs:188
  67: scoped_tls::ScopedKey<T>::set
             at /home/pnkfelix/.cargo/registry/src/github.com-1ecc6299db9ec823/scoped-tls-1.0.0/src/lib.rs:137
  68: syntax::with_globals::{{closure}}
             at /home/pnkfelix/Dev/Mozilla/rust.git/src/libsyntax/lib.rs:109
  69: scoped_tls::ScopedKey<T>::set
             at /home/pnkfelix/.cargo/registry/src/github.com-1ecc6299db9ec823/scoped-tls-1.0.0/src/lib.rs:137
  70: syntax::with_globals
             at /home/pnkfelix/Dev/Mozilla/rust.git/src/libsyntax/lib.rs:108
  71: rustc_interface::util::spawn_thread_pool::{{closure}}
             at /home/pnkfelix/Dev/Mozilla/rust.git/src/librustc_interface/util.rs:187
  72: rustc_interface::util::scoped_thread::{{closure}}
             at /home/pnkfelix/Dev/Mozilla/rust.git/src/librustc_interface/util.rs:164
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
query stack during panic:
end of query stack
error: aborting due to previous error


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 1.38.0-dev running on x86_64-unknown-linux-gnu