polonius liveness facts not implemented yet

[bhuztez]

when compiling unicode-xid v0.1.0 with rustc 1.30.0-nightly (7061b2775 2018-08-28) and compiler flags: -Z external-macro-backtrace -Z borrowck=mir -Z polonius, the compiler panicked.

error: internal compiler error: librustc_mir/borrow_check/nll/type_check/liveness/trace.rs:531: polonius liveness facts not implemented yet

thread 'main' panicked at 'Box<Any>', librustc_errors/lib.rs:587:9
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
             at libstd/sys_common/backtrace.rs:59
   2: std::panicking::default_hook::{{closure}}
             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:481
   6: std::panicking::begin_panic
   7: rustc_errors::Handler::bug
   8: rustc::util::bug::opt_span_bug_fmt::{{closure}}
   9: rustc::ty::context::tls::with_opt::{{closure}}
  10: rustc::ty::context::tls::with_context_opt
  11: rustc::ty::context::tls::with_opt
  12: rustc::util::bug::opt_span_bug_fmt
  13: rustc::util::bug::bug_fmt
  14: <rustc::ty::fold::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::any_free_region_meets::RegionVisitor<F> as rustc::ty::fold::TypeVisitor<'tcx>>::visit_region
  15: rustc::ty::structural_impls::<impl rustc::ty::fold::TypeFoldable<'tcx> for &'tcx rustc::ty::TyS<'tcx>>::super_visit_with
  16: rustc_mir::borrow_check::nll::type_check::liveness::generate
  17: rustc_mir::borrow_check::nll::type_check::type_check
  18: rustc_mir::borrow_check::nll::compute_regions
  19: rustc_mir::borrow_check::do_mir_borrowck
  20: rustc::ty::context::GlobalCtxt::enter_local
  21: rustc_mir::borrow_check::mir_borrowck
  22: rustc::ty::query::__query_compute::mir_borrowck
  23: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors<'tcx> for rustc::ty::query::queries::mir_borrowck<'tcx>>::compute
  24: rustc::dep_graph::graph::DepGraph::with_task_impl
  25: <rustc::ty::query::plumbing::JobOwner<'a, 'tcx, Q>>::start
  26: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::force_query_with_job
  27: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::get_query
  28: rustc::ty::query::<impl rustc::ty::context::TyCtxt<'a, 'tcx, 'lcx>>::mir_borrowck
  29: rustc::ty::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::par_body_owners
  30: rustc::util::common::time
  31: rustc::ty::context::tls::enter_context
  32: <std::thread::local::LocalKey<T>>::with
  33: rustc::ty::context::TyCtxt::create_and_enter
  34: rustc_driver::driver::compile_input
  35: rustc_driver::run_compiler_with_pool
  36: <scoped_tls::ScopedKey<T>>::set
  37: rustc_driver::run_compiler
  38: syntax::with_globals
  39: __rust_maybe_catch_panic
             at libpanic_unwind/lib.rs:103
  40: rustc_driver::run
  41: rustc_driver::main
  42: std::rt::lang_start::{{closure}}
  43: std::panicking::try::do_call
             at libstd/rt.rs:59
             at libstd/panicking.rs:310
  44: __rust_maybe_catch_panic
             at libpanic_unwind/lib.rs:103
  45: std::rt::lang_start_internal
             at libstd/panicking.rs:289
             at libstd/panic.rs:392
             at libstd/rt.rs:58
  46: main
  47: __libc_start_main
  48: <unknown>
query stack during panic:
#0 [mir_borrowck] processing `tables::bsearch_range_table`
end of query stack
error: aborting due to previous error

[robsmith11]

Same issue compiling this crate:
https://github.com/robsmith11/krust