ICE triggered by rustc-ap-rustc_data_structures-230

[lu-zero]

thread 'main' panicked at 'region_obligations not empty: [
    (
        NodeId(
            12851
        ),
        RegionObligation(sub_region='_#2r, sup_type=T)
    )
]', librustc/infer/mod.rs:1057:9
stack backtrace:
   0: std::sys::unix::backtrace::tracing::imp::unwind_backtrace
   1: std::sys_common::backtrace::print
   2: std::panicking::default_hook::{{closure}}
   3: std::panicking::default_hook
   4: rustc::util::common::panic_hook
   5: std::panicking::rust_panic_with_hook
   6: std::panicking::continue_panic_fmt
   7: std::panicking::begin_panic_fmt
   8: rustc::infer::InferCtxt::take_and_reset_region_constraints
   9: rustc_mir::borrow_check::nll::type_check::TypeChecker::eq_types
  10: rustc_mir::borrow_check::nll::type_check::TypeVerifier::sanitize_projection
  11: rustc_mir::borrow_check::nll::type_check::TypeVerifier::sanitize_place
  12: rustc_mir::borrow_check::nll::type_check::TypeVerifier::sanitize_place
  13: <rustc_mir::borrow_check::nll::type_check::TypeVerifier<'a, 'b, 'gcx, 'tcx> as rustc::mir::visit::Visitor<'tcx>>::visit_rvalue
  14: <rustc_mir::borrow_check::nll::type_check::TypeVerifier<'a, 'b, 'gcx, 'tcx> as rustc::mir::visit::Visitor<'tcx>>::visit_mir
  15: rustc_mir::borrow_check::nll::type_check::type_check_internal
  16: rustc_mir::borrow_check::nll::compute_regions
  17: rustc_mir::borrow_check::do_mir_borrowck
  18: rustc::ty::context::GlobalCtxt::enter_local
  19: rustc_mir::borrow_check::mir_borrowck
  20: rustc::ty::query::__query_compute::mir_borrowck
  21: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors<'tcx> for rustc::ty::query::queries::mir_borrowck<'tcx>>::compute
  22: rustc::dep_graph::graph::DepGraph::with_task_impl
  23: rustc::ty::context::tls::with_related_context
  24: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::force_query_with_job
  25: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::get_query
  26: rustc::ty::query::<impl rustc::ty::context::TyCtxt<'a, 'tcx, 'lcx>>::mir_borrowck
  27: rustc::ty::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::par_body_owners
  28: rustc::util::common::time
  29: rustc::ty::context::tls::enter_context
  30: <std::thread::local::LocalKey<T>>::with
  31: rustc::ty::context::TyCtxt::create_and_enter
  32: rustc_driver::driver::compile_input
  33: rustc_driver::run_compiler_with_pool
  34: <scoped_tls::ScopedKey<T>>::set
  35: syntax::with_globals
  36: <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once
  37: __rust_maybe_catch_panic
  38: rustc_driver::run
  39: rustc_driver::main
  40: std::rt::lang_start::{{closure}}
  41: std::panicking::try::do_call
  42: __rust_maybe_catch_panic
  43: std::rt::lang_start_internal
  44: main
query stack during panic:
#0 [mir_borrowck] processing `<ptr_key::PtrKey<'a, T> as std::ops::Deref>::deref`
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 1.28.0-nightly (f28c7aef7 2018-06-19) running on x86_64-apple-darwin

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

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

error: Could not compile `rustc-ap-rustc_data_structures`.

[matthiaskrgr]

Could be another case of #52992 ?

[nikomatsakis]

hopefully a dup, assigning to myself to test

[nikomatsakis]

@lu-zero actually, what code is being compiled here exactly?

[lu-zero]

It is probably a duplicate, I updated to the current nightly and it went away. Probably it is safe to close.

[nikomatsakis]

Closing.