ICE trying to compile libstd with -Zmir-opt-level=3

[bjorn3]

error: internal compiler error: src/librustc_mir/transform/inline.rs:677: Return place is (*_28), not local

thread 'rustc' panicked at 'Box<Any>', src/librustc_errors/lib.rs:643:9
stack backtrace:
   0: backtrace::backtrace::libunwind::trace
             at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.35/src/backtrace/libunwind.rs:88
   1: backtrace::backtrace::trace_unsynchronized
             at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.35/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: rustc::util::common::panic_hook
   7: std::panicking::rust_panic_with_hook
             at src/libstd/panicking.rs:481
   8: std::panicking::begin_panic
   9: rustc_errors::Handler::bug
  10: rustc::util::bug::opt_span_bug_fmt::{{closure}}
  11: rustc::ty::context::tls::with_opt::{{closure}}
  12: rustc::ty::context::tls::with_context_opt
  13: rustc::ty::context::tls::with_opt
  14: rustc::util::bug::opt_span_bug_fmt
  15: rustc::util::bug::bug_fmt
  16: <rustc_mir::transform::inline::Integrator as rustc::mir::visit::MutVisitor>::visit_local
  17: <rustc_mir::transform::inline::Integrator as rustc::mir::visit::MutVisitor>::visit_place
  18: <rustc_mir::transform::inline::Integrator as rustc::mir::visit::MutVisitor>::visit_basic_block_data
  19: rustc_mir::transform::inline::Inliner::run_pass
  20: <rustc_mir::transform::inline::Inline as rustc_mir::transform::MirPass>::run_pass
  21: rustc_mir::transform::run_passes::{{closure}}
  22: rustc_mir::transform::run_passes
  23: rustc_mir::transform::optimized_mir
  24: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors for rustc::ty::query::queries::optimized_mir>::compute
  25: rustc::dep_graph::graph::DepGraph::with_task_impl
  26: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
  27: rustc_mir::monomorphize::collector::collect_items_rec
  28: rustc_mir::monomorphize::collector::collect_items_rec
  29: rustc_mir::monomorphize::collector::collect_items_rec
  30: rustc_mir::monomorphize::collector::collect_items_rec
  31: rustc_mir::monomorphize::collector::collect_items_rec
  32: rustc_mir::monomorphize::collector::collect_items_rec
  33: rustc_mir::monomorphize::collector::collect_items_rec
  34: rustc_mir::monomorphize::collector::collect_items_rec
  35: rustc_mir::monomorphize::collector::collect_items_rec
  36: rustc_mir::monomorphize::collector::collect_items_rec
  37: rustc_mir::monomorphize::collector::collect_items_rec
  38: rustc_mir::monomorphize::collector::collect_items_rec
  39: rustc_mir::monomorphize::collector::collect_items_rec
  40: rustc_mir::monomorphize::collector::collect_items_rec
  41: rustc_mir::monomorphize::collector::collect_items_rec
  42: rustc_mir::monomorphize::collector::collect_items_rec
  43: rustc_mir::monomorphize::collector::collect_crate_mono_items::{{closure}}
  44: rustc_mir::monomorphize::collector::collect_crate_mono_items
  45: rustc::util::common::time
  46: rustc_mir::monomorphize::partitioning::collect_and_partition_mono_items
  47: rustc::ty::query::__query_compute::collect_and_partition_mono_items
  48: rustc::dep_graph::graph::DepGraph::with_task_impl
  49: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
  50: rustc_codegen_ssa::back::symbol_export::exported_symbols_provider_local
  51: rustc::ty::query::__query_compute::exported_symbols
  52: rustc::dep_graph::graph::DepGraph::with_task_impl
  53: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
  54: rustc_metadata::encoder::EncodeContext::encode_crate_root
  55: rustc::dep_graph::graph::DepGraph::with_ignore
  56: rustc_metadata::encoder::encode_metadata
  57: rustc_metadata::cstore_impl::<impl rustc::middle::cstore::CrateStore for rustc_metadata::cstore::CStore>::encode_metadata
  58: rustc::ty::context::TyCtxt::encode_metadata
  59: rustc_interface::passes::encode_and_write_metadata
  60: rustc::util::common::time
  61: rustc_interface::passes::BoxedGlobalCtxt::access::{{closure}}
  62: rustc_interface::passes::create_global_ctxt::{{closure}}
  63: rustc_interface::passes::BoxedGlobalCtxt::enter
  64: rustc_interface::queries::Query<T>::compute
  65: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::ongoing_codegen
  66: rustc_interface::interface::run_compiler_in_existing_thread_pool
  67: std::thread::local::LocalKey<T>::with
  68: scoped_tls::ScopedKey<T>::set
  69: syntax::with_globals
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
query stack during panic:
#0 [optimized_mir] processing `sys_common::thread_local::register_dtor_fallback`
#1 [collect_and_partition_mono_items] collect_and_partition_mono_items
#2 [exported_symbols] exported_symbols
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 1.39.0-nightly (e44fdf979 2019-08-21) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z mir-opt-level=3 -C prefer-dynamic -C debuginfo=2 -C debug-assertions=off -C overflow-checks=on -C incremental --crate-type dylib --crate-type rlib

note: some of the compiler flags provided by cargo are hidden

error: Could not compile `std`.

I tried to compile it with the panic_unwind cargo feature set.

[jonas-schievink]

This is working fine now!