The rust compiler is experiencing a panic when running a juniper example

[kmox83]

The rust compiler is experiencing a panic when running a juniper example

I tried this code:

I run the example from the repository https://github.com/graphql-rust/juniper
commit SHA c93911958a2749c74232ac851f16d90fa943df91
In the folder https://github.com/graphql-rust/juniper/tree/master/juniper_hyper

Running: cargo run --example hyper_server

I expected to see this happen: The server to be running

Instead, this happened: it has been triggered a panic event from the rust compiler

Meta

os-version:
Darwin kmacw-2.local 18.5.0 Darwin Kernel Version 18.5.0: Mon Mar 11 20:40:32 PDT 2019; root:xnu-4903.251.3~3/RELEASE_X86_64 x86_64

rustc --version --verbose:

binary: rustc
commit-hash: 6c2484dc3c532c052f159264e970278d8b77cdc9
commit-date: 2019-05-13
host: x86_64-apple-darwin
release: 1.34.2
LLVM version: 8.0

Backtrace:

error: internal compiler error: src/librustc_mir/borrow_check/nll/universal_regions.rs:745: cannot convert `ReScope(Node(238))` to a region vid

thread 'rustc' panicked at 'Box<Any>', src/librustc_errors/lib.rs:620:9
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::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_mir::borrow_check::nll::universal_regions::UniversalRegionIndices::to_region_vid::{{closure}}
  15: rustc_mir::borrow_check::nll::universal_regions::UniversalRegionIndices::to_region_vid
  16: rustc_mir::borrow_check::nll::type_check::constraint_conversion::ConstraintConversion::convert_all
  17: rustc_mir::borrow_check::nll::type_check::TypeChecker::prove_predicate
  18: rustc_mir::borrow_check::nll::type_check::TypeChecker::check_stmt
  19: rustc_mir::borrow_check::nll::type_check::TypeChecker::typeck_mir
  20: rustc_mir::borrow_check::nll::type_check::type_check
  21: rustc_mir::borrow_check::nll::compute_regions
  22: rustc_mir::borrow_check::do_mir_borrowck
  23: rustc::ty::context::GlobalCtxt::enter_local
  24: rustc_mir::borrow_check::mir_borrowck
  25: rustc::ty::query::__query_compute::mir_borrowck
  26: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors<'tcx> for rustc::ty::query::queries::mir_borrowck<'tcx>>::compute
  27: rustc::dep_graph::graph::DepGraph::with_task_impl
  28: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::get_query
  29: rustc_mir::borrow_check::nll::type_check::TypeChecker::check_stmt
  30: rustc_mir::borrow_check::nll::type_check::TypeChecker::typeck_mir
  31: rustc_mir::borrow_check::nll::type_check::type_check
  32: rustc_mir::borrow_check::nll::compute_regions
  33: rustc_mir::borrow_check::do_mir_borrowck
  34: rustc::ty::context::GlobalCtxt::enter_local
  35: rustc_mir::borrow_check::mir_borrowck
  36: rustc::ty::query::__query_compute::mir_borrowck
  37: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors<'tcx> for rustc::ty::query::queries::mir_borrowck<'tcx>>::compute
  38: rustc::dep_graph::graph::DepGraph::with_task_impl
  39: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::get_query
  40: rustc_mir::borrow_check::nll::type_check::TypeChecker::check_stmt
  41: rustc_mir::borrow_check::nll::type_check::TypeChecker::typeck_mir
  42: rustc_mir::borrow_check::nll::type_check::type_check
  43: rustc_mir::borrow_check::nll::compute_regions
  44: rustc_mir::borrow_check::do_mir_borrowck
  45: rustc::ty::context::GlobalCtxt::enter_local
  46: rustc_mir::borrow_check::mir_borrowck
  47: rustc::ty::query::__query_compute::mir_borrowck
  48: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors<'tcx> for rustc::ty::query::queries::mir_borrowck<'tcx>>::compute
  49: rustc::dep_graph::graph::DepGraph::with_task_impl
  50: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::get_query
  51: rustc::ty::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::par_body_owners
  52: rustc::util::common::time
  53: <std::thread::local::LocalKey<T>>::with
  54: rustc::ty::context::TyCtxt::create_and_enter
  55: rustc_driver::driver::compile_input
  56: rustc_driver::run_compiler_with_pool
  57: <scoped_tls::ScopedKey<T>>::set
  58: rustc_driver::run_compiler
  59: syntax::with_globals
  60: __rust_maybe_catch_panic
  61: <F as alloc::boxed::FnBox<A>>::call_box
  62: std::sys::unix::thread::Thread::new::thread_start
  63: _pthread_body
  64: _pthread_start
query stack during panic:
#0 [mir_borrowck] processing `main::{{closure}}::{{closure}}`
#1 [mir_borrowck] processing `main::{{closure}}`
#2 [mir_borrowck] processing `main`
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 1.34.2 (6c2484dc3 2019-05-13) running on x86_64-apple-darwin

note: compiler flags: -C debuginfo=2 -C incremental --crate-type bin

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

error: Could not compile `juniper_hyper`.

To learn more, run the command again with --verbose.

[jonas-schievink]

Duplicate of #59344 and #58840, so closing in favor of those.

Can you try building the example with the current nightly? It should be fixed there.