Compilation panicked

[gcao]

Compilation exited abnormally when compiling this code
I know my code has a lot of issues but the compiler should either pass or fail instead of panicking

Steps to reproduce
git clone https://github.com/gcao/gene.rs.git
cd gene.rs
git checkout f861fba0d25f6a6de2f01a680bd39eebcf40b7e2
cargo build

The previous commit compiles fine. The changes in the commit can be found here:
gcao/gene.rs@f861fba

stack backtrace:
0: std::panicking::default_hook::{{closure}}
1: std::panicking::default_hook
0: std::panicking::default_hook::{{closure}}
1: std::panicking::default_hook
2: rustc::util::common::panic_hook
2: rustc::util::common::panic_hook
3: std::panicking::rust_panic_with_hook
3: std::panicking::rust_panic_with_hook
4: std::panicking::begin_panic
5: rustc_borrowck::borrowck::check_loans::CheckLoanCtxt::report_error_if_loans_conflict
4: std::panicking::begin_panic
6: rustc_borrowck::dataflow::DataFlowContext::each_bit_on_entry
5: rustc_borrowck::borrowck::check_loans::CheckLoanCtxt::report_error_if_loans_conflict
7: <rustc_borrowck::borrowck::check_loans::CheckLoanCtxt as rustc::middle::expr_use_visitor::Delegate>::borrow
6: rustc_borrowck::dataflow::DataFlowContext::each_bit_on_entry
7: <rustc_borrowck::borrowck::check_loans::CheckLoanCtxt as rustc::middle::expr_use_visitor::Delegate>::borrow
8: rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr
9: rustc::middle::expr_use_visitor::ExprUseVisitor::consume_expr
8: rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr
10: rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr
9: rustc::middle::expr_use_visitor::ExprUseVisitor::consume_expr
11: rustc::middle::expr_use_visitor::ExprUseVisitor::consume_expr
10: rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr
12: rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr
11: rustc::middle::expr_use_visitor::ExprUseVisitor::consume_expr
13: rustc::middle::expr_use_visitor::ExprUseVisitor::consume_expr
12: rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr
14: rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr
13: rustc::middle::expr_use_visitor::ExprUseVisitor::consume_expr
15: rustc::middle::expr_use_visitor::ExprUseVisitor::consume_expr
16: rustc_borrowck::borrowck::check_loans::check_loans
14: rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr
17: rustc_borrowck::borrowck::borrowck
15: rustc::middle::expr_use_visitor::ExprUseVisitor::consume_expr
16: rustc_borrowck::borrowck::check_loans::check_loans
17: rustc_borrowck::borrowck::borrowck
18: rustc::ty::query::__query_compute::borrowck
18: rustc::ty::query::__query_compute::borrowck
19: rustc::ty::query::::compute
19: rustc::ty::query::::compute
20: rustc::dep_graph::graph::DepGraph::with_task_impl
20: rustc::dep_graph::graph::DepGraph::with_task_impl
21: rustc::ty::query::plumbing::::get_query
22: rustc_mir::borrow_check::do_mir_borrowck
21: rustc::ty::query::plumbing::::get_query
23: rustc::ty::context::GlobalCtxt::enter_local
22: rustc_mir::borrow_check::do_mir_borrowck
24: rustc_mir::borrow_check::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::::compute
27: rustc::dep_graph::graph::DepGraph::with_task_impl
25: rustc::ty::query::__query_compute::mir_borrowck
28: rustc::ty::query::plumbing::::get_query
26: rustc::ty::query::::compute
29: rustc::ty::::par_body_owners
27: rustc::dep_graph::graph::DepGraph::with_task_impl
28: rustc::ty::query::plumbing::::get_query
30: rustc::util::common::time
31: rustc_interface::passes::analysis
29: rustc::ty::::par_body_owners
30: rustc::util::common::time
31: rustc_interface::passes::analysis
32: rustc::ty::query::__query_compute::analysis
32: rustc::ty::query::__query_compute::analysis
33: rustc::ty::query::::compute
33: rustc::ty::query::::compute
34: rustc::dep_graph::graph::DepGraph::with_task_impl
35: rustc::ty::query::plumbing::::get_query
34: rustc::dep_graph::graph::DepGraph::with_task_impl
35: rustc::ty::query::plumbing::::get_query
36: rustc::ty::context::tls::enter_global
36: rustc::ty::context::tls::enter_global
37: rustc_interface::passes::BoxedGlobalCtxt::access::{{closure}}
37: rustc_interface::passes::BoxedGlobalCtxt::access::{{closure}}
38: rustc_interface::passes::create_global_ctxt::{{closure}}
38: rustc_interface::passes::create_global_ctxt::{{closure}}
39: rustc_interface::interface::run_compiler_in_existing_thread_pool
39: rustc_interface::interface::run_compiler_in_existing_thread_pool
40: std::thread::local::LocalKey::with
40: std::thread::local::LocalKey::with
41: scoped_tls::ScopedKey::set
41: scoped_tls::ScopedKey::set
42: syntax::with_globals
42: syntax::with_globals
note: Some details are omitted, run with RUST_BACKTRACE=full for a verbose backtrace.
note: Some details are omitted, run with RUST_BACKTRACE=full for a verbose backtrace.
query stack during panic:
query stack during panic:
#0 [borrowck] processing compiler::Compiler::compile_gene
#0 [borrowck] processing compiler::Compiler::compile_gene
#1 [mir_borrowck] processing compiler::Compiler::compile_gene
#1 [mir_borrowck] processing compiler::Compiler::compile_gene
#2 [analysis] running analysis passes on this crate
end of query stack
#2 [analysis] running analysis passes on this crate
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 1.37.0-nightly (0beb2ba 2019-07-02) running on x86_64-apple-darwin

note: compiler flags: -C debuginfo=2 -C incremental

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

[jonas-schievink]

It's in legacy borrowck, so tentatively marking as fixed-by-NLL

[matthewjasper]

Can you test this on a newer nightly? It looks like the issue fixed by #62233

[jonas-schievink]

Confirmed as fixed on nightly, closing.