[INFO] updating cached repository ruggeri/rust_learning [INFO] running `"git" "fetch" "--all"` [INFO] [stdout] Fetching origin [INFO] [stderr] From git://github.com/ruggeri/rust_learning [INFO] [stderr] * branch HEAD -> FETCH_HEAD [INFO] running `"git" "clone" "work/cache/sources/gh/ruggeri/rust_learning" "work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/gh/ruggeri/rust_learning"` [INFO] [stderr] Cloning into 'work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/gh/ruggeri/rust_learning'... [INFO] [stderr] done. [INFO] running `"git" "clone" "work/cache/sources/gh/ruggeri/rust_learning" "work/ex/pr-62133/sources/try#8ec8125bea94852768b56958f05da47666c21ab0/gh/ruggeri/rust_learning"` [INFO] [stderr] Cloning into 'work/ex/pr-62133/sources/try#8ec8125bea94852768b56958f05da47666c21ab0/gh/ruggeri/rust_learning'... [INFO] [stderr] done. [INFO] running `"git" "rev-parse" "HEAD"` [INFO] [stdout] 6564c9e695a39cf690d74e0eb370d542f146007c [INFO] sha for GitHub repo ruggeri/rust_learning: 6564c9e695a39cf690d74e0eb370d542f146007c [INFO] validating manifest of ruggeri/rust_learning on toolchain master#5f9c0448dde167128d668da4555879f64e56af1d [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+5f9c0448dde167128d668da4555879f64e56af1d-alt" "read-manifest" "--manifest-path" "Cargo.toml"` [INFO] validating manifest of ruggeri/rust_learning on toolchain try#8ec8125bea94852768b56958f05da47666c21ab0 [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+8ec8125bea94852768b56958f05da47666c21ab0-alt" "read-manifest" "--manifest-path" "Cargo.toml"` [INFO] started frobbing ruggeri/rust_learning [INFO] finished frobbing ruggeri/rust_learning [INFO] frobbed toml for ruggeri/rust_learning written to work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/gh/ruggeri/rust_learning/Cargo.toml [INFO] started frobbing ruggeri/rust_learning [INFO] finished frobbing ruggeri/rust_learning [INFO] frobbed toml for ruggeri/rust_learning written to work/ex/pr-62133/sources/try#8ec8125bea94852768b56958f05da47666c21ab0/gh/ruggeri/rust_learning/Cargo.toml [INFO] crate ruggeri/rust_learning already has a lockfile, it will not be regenerated [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+5f9c0448dde167128d668da4555879f64e56af1d-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"` [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+8ec8125bea94852768b56958f05da47666c21ab0-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"` [INFO] checking ruggeri/rust_learning against master#5f9c0448dde167128d668da4555879f64e56af1d for pr-62133 [INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-62133/worker-1/master#5f9c0448dde167128d668da4555879f64e56af1d:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/gh/ruggeri/rust_learning:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+5f9c0448dde167128d668da4555879f64e56af1d-alt" "check" "--frozen" "--all" "--all-targets"` [INFO] [stdout] 548f6509a66ad869ad9fcc6f609b156008f62706be506712c8e2c9d35182b257 [INFO] running `"docker" "start" "-a" "548f6509a66ad869ad9fcc6f609b156008f62706be506712c8e2c9d35182b257"` [INFO] [stderr] Checking rust_learning v0.1.0 (/opt/crater/workdir) [INFO] [stderr] thread 'rustc' panicked at 'assertion failed: self.bccx.region_scope_tree.scopes_intersect(old_loan.kill_scope, [INFO] [stderr] new_loan.kill_scope)', src/librustc_borrowck/borrowck/check_loans.rs:493:9 [INFO] [stderr] stack backtrace: [INFO] [stderr] 0: 0x7f3b541d211b - backtrace::backtrace::libunwind::trace::h0c70a293f076b04d [INFO] [stderr] at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/libunwind.rs:88 [INFO] [stderr] 1: 0x7f3b541d211b - backtrace::backtrace::trace_unsynchronized::h1bc693e29cfaa7b4 [INFO] [stderr] at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/mod.rs:66 [INFO] [stderr] 2: 0x7f3b541d211b - std::sys_common::backtrace::_print::h8e9bb00be68d4090 [INFO] [stderr] at src/libstd/sys_common/backtrace.rs:47 [INFO] [stderr] 3: 0x7f3b541d211b - std::sys_common::backtrace::print::h706192507dd9d34d [INFO] [stderr] at src/libstd/sys_common/backtrace.rs:36 [INFO] [stderr] 4: 0x7f3b541d211b - std::panicking::default_hook::{{closure}}::he2b558091ea21dea [INFO] [stderr] at src/libstd/panicking.rs:198 [INFO] [stderr] 5: 0x7f3b541d1df7 - std::panicking::default_hook::hfb9d48d2b8aaf0f5 [INFO] [stderr] at src/libstd/panicking.rs:212 [INFO] [stderr] 6: 0x7f3b51735761 - rustc::util::common::panic_hook::h41f9097f07b95669 [INFO] [stderr] 7: 0x7f3b541d2979 - std::panicking::rust_panic_with_hook::h56bb6d26ac5aac90 [INFO] [stderr] at src/libstd/panicking.rs:479 [INFO] [stderr] 8: 0x7f3b531733a5 - std::panicking::begin_panic::h1321ff0a0a88d2f8 [INFO] [stderr] 9: 0x7f3b53142b3d - rustc_borrowck::borrowck::check_loans::CheckLoanCtxt::report_error_if_loans_conflict::h39bfad1202b2c3cf [INFO] [stderr] 10: 0x7f3b53123d3e - rustc_borrowck::dataflow::DataFlowContext::each_bit_on_entry::h64e48c588a3f27ab [INFO] [stderr] 11: 0x7f3b53141f20 - ::borrow::h7315056b672b73c9 [INFO] [stderr] 12: 0x7f3b51705f5a - rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr::h49115deaa1684759 [INFO] [stderr] 13: 0x7f3b517059fd - rustc::middle::expr_use_visitor::ExprUseVisitor::consume_expr::hada9db85784d3899 [INFO] [stderr] 14: 0x7f3b517065a1 - rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr::h49115deaa1684759 [INFO] [stderr] 15: 0x7f3b517059fd - rustc::middle::expr_use_visitor::ExprUseVisitor::consume_expr::hada9db85784d3899 [INFO] [stderr] 16: 0x7f3b51706f64 - rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr::h49115deaa1684759 [INFO] [stderr] 17: 0x7f3b517059fd - rustc::middle::expr_use_visitor::ExprUseVisitor::consume_expr::hada9db85784d3899 [INFO] [stderr] 18: 0x7f3b51707293 - rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr::h49115deaa1684759 [INFO] [stderr] 19: 0x7f3b517059fd - rustc::middle::expr_use_visitor::ExprUseVisitor::consume_expr::hada9db85784d3899 [INFO] [stderr] 20: 0x7f3b53142822 - rustc_borrowck::borrowck::check_loans::check_loans::hc18fe233fa81046a [INFO] [stderr] 21: 0x7f3b531499b2 - rustc_borrowck::borrowck::borrowck::hb977edcebeedd1fc [INFO] [stderr] 22: 0x7f3b529c08f0 - rustc::ty::query::__query_compute::borrowck::h9cde66edae670b36 [INFO] [stderr] 23: 0x7f3b52d3d3fd - rustc::ty::query::::compute::h0b648e75983d4676 [INFO] [stderr] 24: 0x7f3b52a6f76e - rustc::dep_graph::graph::DepGraph::with_task_impl::hacd33624d23d9481 [INFO] [stderr] 25: 0x7f3b52d9dba2 - rustc::ty::query::plumbing::::get_query::habfe019102745584 [INFO] [stderr] 26: 0x7f3b52a8eb1a - rustc_mir::borrow_check::do_mir_borrowck::hbab0591ddac097e7 [INFO] [stderr] 27: 0x7f3b52dc84ed - rustc::ty::context::GlobalCtxt::enter_local::h278dadd0d9b818ab [INFO] [stderr] 28: 0x7f3b52a8b9fa - rustc_mir::borrow_check::mir_borrowck::hec5fc18ec1050d45 [INFO] [stderr] 29: 0x7f3b534ccdd7 - rustc::ty::query::__query_compute::mir_borrowck::hdf0df66551287035 [INFO] [stderr] 30: 0x7f3b5348cc55 - rustc::ty::query::::compute::he5b599a9e4da40f1 [INFO] [stderr] 31: 0x7f3b534bbbc1 - rustc::dep_graph::graph::DepGraph::with_task_impl::h328b32dcbd1c8c1e [INFO] [stderr] 32: 0x7f3b534a4617 - rustc::ty::query::plumbing::::get_query::hb8c5af58bb1695e4 [INFO] [stderr] 33: 0x7f3b5348c943 - rustc::ty::::par_body_owners::h3c1cfe99491fa03a [INFO] [stderr] 34: 0x7f3b5345fb4e - rustc::util::common::time::h44ce0fb14f39f2f7 [INFO] [stderr] 35: 0x7f3b5340d7a2 - rustc_interface::passes::analysis::hdd989cae7ba84359 [INFO] [stderr] 36: 0x7f3b54526406 - rustc::ty::query::__query_compute::analysis::hc56a05e6fc507716 [INFO] [stderr] 37: 0x7f3b54537bc6 - rustc::dep_graph::graph::DepGraph::with_task_impl::h807bdb315e9b066f [INFO] [stderr] 38: 0x7f3b5452fae0 - rustc::ty::query::plumbing::::get_query::h1fc17bfd861474a7 [INFO] [stderr] 39: 0x7f3b544984d6 - rustc::ty::context::tls::enter_global::he0693a124127f22e [INFO] [stderr] 40: 0x7f3b544b9997 - rustc_interface::passes::BoxedGlobalCtxt::access::{{closure}}::hf3ab1225aa3af141 [INFO] [stderr] 41: 0x7f3b53468b4a - rustc_interface::passes::create_global_ctxt::{{closure}}::h114d2b4ac6cc1006 [INFO] [stderr] 42: 0x7f3b544bb4d8 - rustc_interface::interface::run_compiler_in_existing_thread_pool::h67acf0ae37146afa [INFO] [stderr] 43: 0x7f3b544d46b2 - std::thread::local::LocalKey::with::h01f90f501aab9356 [INFO] [stderr] 44: 0x7f3b544c41b1 - scoped_tls::ScopedKey::set::h5988edf95edec101 [INFO] [stderr] 45: 0x7f3b544f8ed4 - syntax::with_globals::h6a559fe575f54f7f [INFO] [stderr] 46: 0x7f3b5451768d - std::sys_common::backtrace::__rust_begin_short_backtrace::h726621dd6bc7eece [INFO] [stderr] 47: 0x7f3b541e33da - __rust_maybe_catch_panic [INFO] [stderr] at src/libpanic_unwind/lib.rs:82 [INFO] [stderr] 48: 0x7f3b544a0ff9 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h728dfa2ec60a49a9 [INFO] [stderr] 49: 0x7f3b541b5dcf - as core::ops::function::FnOnce>::call_once::h6f4f77616a0c8566 [INFO] [stderr] at /rustc/5f9c0448dde167128d668da4555879f64e56af1d/src/liballoc/boxed.rs:746 [INFO] [stderr] 50: 0x7f3b541e20c0 - as core::ops::function::FnOnce>::call_once::h3b73bdd971159c27 [INFO] [stderr] at /rustc/5f9c0448dde167128d668da4555879f64e56af1d/src/liballoc/boxed.rs:746 [INFO] [stderr] 51: 0x7f3b541e20c0 - std::sys_common::thread::start_thread::hbb836908b047b8a8 [INFO] [stderr] at src/libstd/sys_common/thread.rs:13 [INFO] [stderr] 52: 0x7f3b541e20c0 - std::sys::unix::thread::Thread::new::thread_start::h71258354fd833cef [INFO] [stderr] at src/libstd/sys/unix/thread.rs:79 [INFO] [stderr] 53: 0x7f3b53f544a4 - start_thread [INFO] [stderr] 54: 0x7f3b5388ad0f - __clone [INFO] [stderr] 55: 0x0 - [INFO] [stderr] query stack during panic: [INFO] [stderr] #0 [borrowck] processing `bst::bst::BST::::find_mut` [INFO] [stderr] #1 [mir_borrowck] processing `bst::bst::BST::::find_mut` [INFO] [stderr] #2 [analysis] running analysis passes on this crate [INFO] [stderr] end of query stack [INFO] [stderr] [INFO] [stderr] error: internal compiler error: unexpected panic [INFO] [stderr] [INFO] [stderr] note: the compiler unexpectedly panicked. this is a bug. [INFO] [stderr] [INFO] [stderr] note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports [INFO] [stderr] [INFO] [stderr] note: rustc 1.37.0-nightly (5f9c0448d 2019-06-25) running on x86_64-unknown-linux-gnu [INFO] [stderr] [INFO] [stderr] note: compiler flags: -C debuginfo=2 --crate-type lib [INFO] [stderr] [INFO] [stderr] note: some of the compiler flags provided by cargo are hidden [INFO] [stderr] [INFO] [stderr] thread 'rustc' panicked at 'assertion failed: self.bccx.region_scope_tree.scopes_intersect(old_loan.kill_scope, [INFO] [stderr] new_loan.kill_scope)', src/librustc_borrowck/borrowck/check_loans.rs:493:9 [INFO] [stderr] stack backtrace: [INFO] [stderr] error: Could not compile `rust_learning`. [INFO] [stderr] warning: build failed, waiting for other jobs to finish... [INFO] [stderr] 0: 0x7f2ac890a11b - backtrace::backtrace::libunwind::trace::h0c70a293f076b04d [INFO] [stderr] at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/libunwind.rs:88 [INFO] [stderr] 1: 0x7f2ac890a11b - backtrace::backtrace::trace_unsynchronized::h1bc693e29cfaa7b4 [INFO] [stderr] at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/mod.rs:66 [INFO] [stderr] 2: 0x7f2ac890a11b - std::sys_common::backtrace::_print::h8e9bb00be68d4090 [INFO] [stderr] at src/libstd/sys_common/backtrace.rs:47 [INFO] [stderr] 3: 0x7f2ac890a11b - std::sys_common::backtrace::print::h706192507dd9d34d [INFO] [stderr] at src/libstd/sys_common/backtrace.rs:36 [INFO] [stderr] 4: 0x7f2ac890a11b - std::panicking::default_hook::{{closure}}::he2b558091ea21dea [INFO] [stderr] at src/libstd/panicking.rs:198 [INFO] [stderr] 5: 0x7f2ac8909df7 - std::panicking::default_hook::hfb9d48d2b8aaf0f5 [INFO] [stderr] at src/libstd/panicking.rs:212 [INFO] [stderr] 6: 0x7f2ac5e6d761 - rustc::util::common::panic_hook::h41f9097f07b95669 [INFO] [stderr] 7: 0x7f2ac890a979 - std::panicking::rust_panic_with_hook::h56bb6d26ac5aac90 [INFO] [stderr] at src/libstd/panicking.rs:479 [INFO] [stderr] 8: 0x7f2ac78ab3a5 - std::panicking::begin_panic::h1321ff0a0a88d2f8 [INFO] [stderr] 9: 0x7f2ac787ab3d - rustc_borrowck::borrowck::check_loans::CheckLoanCtxt::report_error_if_loans_conflict::h39bfad1202b2c3cf [INFO] [stderr] 10: 0x7f2ac785bd3e - rustc_borrowck::dataflow::DataFlowContext::each_bit_on_entry::h64e48c588a3f27ab [INFO] [stderr] 11: 0x7f2ac7879f20 - ::borrow::h7315056b672b73c9 [INFO] [stderr] 12: 0x7f2ac5e3df5a - rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr::h49115deaa1684759 [INFO] [stderr] 13: 0x7f2ac5e3d9fd - rustc::middle::expr_use_visitor::ExprUseVisitor::consume_expr::hada9db85784d3899 [INFO] [stderr] 14: 0x7f2ac5e3e5a1 - rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr::h49115deaa1684759 [INFO] [stderr] 15: 0x7f2ac5e3d9fd - rustc::middle::expr_use_visitor::ExprUseVisitor::consume_expr::hada9db85784d3899 [INFO] [stderr] 16: 0x7f2ac5e3ef64 - rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr::h49115deaa1684759 [INFO] [stderr] 17: 0x7f2ac5e3d9fd - rustc::middle::expr_use_visitor::ExprUseVisitor::consume_expr::hada9db85784d3899 [INFO] [stderr] 18: 0x7f2ac5e3f293 - rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr::h49115deaa1684759 [INFO] [stderr] 19: 0x7f2ac5e3d9fd - rustc::middle::expr_use_visitor::ExprUseVisitor::consume_expr::hada9db85784d3899 [INFO] [stderr] 20: 0x7f2ac787a822 - rustc_borrowck::borrowck::check_loans::check_loans::hc18fe233fa81046a [INFO] [stderr] 21: 0x7f2ac78819b2 - rustc_borrowck::borrowck::borrowck::hb977edcebeedd1fc [INFO] [stderr] 22: 0x7f2ac70f88f0 - rustc::ty::query::__query_compute::borrowck::h9cde66edae670b36 [INFO] [stderr] 23: 0x7f2ac74753fd - rustc::ty::query::::compute::h0b648e75983d4676 [INFO] [stderr] 24: 0x7f2ac71a776e - rustc::dep_graph::graph::DepGraph::with_task_impl::hacd33624d23d9481 [INFO] [stderr] 25: 0x7f2ac74d5ba2 - rustc::ty::query::plumbing::::get_query::habfe019102745584 [INFO] [stderr] 26: 0x7f2ac71c6b1a - rustc_mir::borrow_check::do_mir_borrowck::hbab0591ddac097e7 [INFO] [stderr] 27: 0x7f2ac75004ed - rustc::ty::context::GlobalCtxt::enter_local::h278dadd0d9b818ab [INFO] [stderr] 28: 0x7f2ac71c39fa - rustc_mir::borrow_check::mir_borrowck::hec5fc18ec1050d45 [INFO] [stderr] 29: 0x7f2ac7c04dd7 - rustc::ty::query::__query_compute::mir_borrowck::hdf0df66551287035 [INFO] [stderr] 30: 0x7f2ac7bc4c55 - rustc::ty::query::::compute::he5b599a9e4da40f1 [INFO] [stderr] 31: 0x7f2ac7bf3bc1 - rustc::dep_graph::graph::DepGraph::with_task_impl::h328b32dcbd1c8c1e [INFO] [stderr] 32: 0x7f2ac7bdc617 - rustc::ty::query::plumbing::::get_query::hb8c5af58bb1695e4 [INFO] [stderr] 33: 0x7f2ac7bc4943 - rustc::ty::::par_body_owners::h3c1cfe99491fa03a [INFO] [stderr] 34: 0x7f2ac7b97b4e - rustc::util::common::time::h44ce0fb14f39f2f7 [INFO] [stderr] 35: 0x7f2ac7b457a2 - rustc_interface::passes::analysis::hdd989cae7ba84359 [INFO] [stderr] 36: 0x7f2ac8c5e406 - rustc::ty::query::__query_compute::analysis::hc56a05e6fc507716 [INFO] [stderr] 37: 0x7f2ac8c6fbc6 - rustc::dep_graph::graph::DepGraph::with_task_impl::h807bdb315e9b066f [INFO] [stderr] 38: 0x7f2ac8c67ae0 - rustc::ty::query::plumbing::::get_query::h1fc17bfd861474a7 [INFO] [stderr] 39: 0x7f2ac8bd04d6 - rustc::ty::context::tls::enter_global::he0693a124127f22e [INFO] [stderr] 40: 0x7f2ac8bf1997 - rustc_interface::passes::BoxedGlobalCtxt::access::{{closure}}::hf3ab1225aa3af141 [INFO] [stderr] 41: 0x7f2ac7ba0b4a - rustc_interface::passes::create_global_ctxt::{{closure}}::h114d2b4ac6cc1006 [INFO] [stderr] 42: 0x7f2ac8bf34d8 - rustc_interface::interface::run_compiler_in_existing_thread_pool::h67acf0ae37146afa [INFO] [stderr] 43: 0x7f2ac8c0c6b2 - std::thread::local::LocalKey::with::h01f90f501aab9356 [INFO] [stderr] 44: 0x7f2ac8bfc1b1 - scoped_tls::ScopedKey::set::h5988edf95edec101 [INFO] [stderr] 45: 0x7f2ac8c30ed4 - syntax::with_globals::h6a559fe575f54f7f [INFO] [stderr] 46: 0x7f2ac8c4f68d - std::sys_common::backtrace::__rust_begin_short_backtrace::h726621dd6bc7eece [INFO] [stderr] 47: 0x7f2ac891b3da - __rust_maybe_catch_panic [INFO] [stderr] at src/libpanic_unwind/lib.rs:82 [INFO] [stderr] 48: 0x7f2ac8bd8ff9 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h728dfa2ec60a49a9 [INFO] [stderr] 49: 0x7f2ac88eddcf - as core::ops::function::FnOnce>::call_once::h6f4f77616a0c8566 [INFO] [stderr] at /rustc/5f9c0448dde167128d668da4555879f64e56af1d/src/liballoc/boxed.rs:746 [INFO] [stderr] 50: 0x7f2ac891a0c0 - as core::ops::function::FnOnce>::call_once::h3b73bdd971159c27 [INFO] [stderr] at /rustc/5f9c0448dde167128d668da4555879f64e56af1d/src/liballoc/boxed.rs:746 [INFO] [stderr] 51: 0x7f2ac891a0c0 - std::sys_common::thread::start_thread::hbb836908b047b8a8 [INFO] [stderr] at src/libstd/sys_common/thread.rs:13 [INFO] [stderr] 52: 0x7f2ac891a0c0 - std::sys::unix::thread::Thread::new::thread_start::h71258354fd833cef [INFO] [stderr] at src/libstd/sys/unix/thread.rs:79 [INFO] [stderr] 53: 0x7f2ac868c4a4 - start_thread [INFO] [stderr] 54: 0x7f2ac7fc2d0f - __clone [INFO] [stderr] 55: 0x0 - [INFO] [stderr] query stack during panic: [INFO] [stderr] #0 [borrowck] processing `bst::bst::BST::::find_mut` [INFO] [stderr] #1 [mir_borrowck] processing `bst::bst::BST::::find_mut` [INFO] [stderr] #2 [analysis] running analysis passes on this crate [INFO] [stderr] end of query stack [INFO] [stderr] [INFO] [stderr] error: internal compiler error: unexpected panic [INFO] [stderr] [INFO] [stderr] note: the compiler unexpectedly panicked. this is a bug. [INFO] [stderr] [INFO] [stderr] note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports [INFO] [stderr] [INFO] [stderr] note: rustc 1.37.0-nightly (5f9c0448d 2019-06-25) running on x86_64-unknown-linux-gnu [INFO] [stderr] [INFO] [stderr] note: compiler flags: -C debuginfo=2 [INFO] [stderr] [INFO] [stderr] note: some of the compiler flags provided by cargo are hidden [INFO] [stderr] [INFO] [stderr] error: Could not compile `rust_learning`. [INFO] [stderr] [INFO] [stderr] To learn more, run the command again with --verbose. [INFO] running `"docker" "inspect" "548f6509a66ad869ad9fcc6f609b156008f62706be506712c8e2c9d35182b257"` [INFO] running `"docker" "rm" "-f" "548f6509a66ad869ad9fcc6f609b156008f62706be506712c8e2c9d35182b257"` [INFO] [stdout] 548f6509a66ad869ad9fcc6f609b156008f62706be506712c8e2c9d35182b257