[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-62507/sources/master#78ca1bda3522b14bc0336bc01dd1d49fdba2cda7/gh/ruggeri/rust_learning"` [INFO] [stderr] Cloning into 'work/ex/pr-62507/sources/master#78ca1bda3522b14bc0336bc01dd1d49fdba2cda7/gh/ruggeri/rust_learning'... [INFO] [stderr] done. [INFO] running `"git" "clone" "work/cache/sources/gh/ruggeri/rust_learning" "work/ex/pr-62507/sources/try#18481b65f318e0b4b20c0fc61340054701719d6c/gh/ruggeri/rust_learning"` [INFO] [stderr] Cloning into 'work/ex/pr-62507/sources/try#18481b65f318e0b4b20c0fc61340054701719d6c/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#78ca1bda3522b14bc0336bc01dd1d49fdba2cda7 [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+78ca1bda3522b14bc0336bc01dd1d49fdba2cda7-alt" "read-manifest" "--manifest-path" "Cargo.toml"` [INFO] validating manifest of ruggeri/rust_learning on toolchain try#18481b65f318e0b4b20c0fc61340054701719d6c [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+18481b65f318e0b4b20c0fc61340054701719d6c-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-62507/sources/master#78ca1bda3522b14bc0336bc01dd1d49fdba2cda7/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-62507/sources/try#18481b65f318e0b4b20c0fc61340054701719d6c/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" "+78ca1bda3522b14bc0336bc01dd1d49fdba2cda7-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"` [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+18481b65f318e0b4b20c0fc61340054701719d6c-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"` [INFO] checking ruggeri/rust_learning against try#18481b65f318e0b4b20c0fc61340054701719d6c for pr-62507 [INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-62507/worker-7/try#18481b65f318e0b4b20c0fc61340054701719d6c:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-62507/sources/try#18481b65f318e0b4b20c0fc61340054701719d6c/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" "+18481b65f318e0b4b20c0fc61340054701719d6c-alt" "check" "--frozen" "--all" "--all-targets"` [INFO] [stdout] ee1dc1b150250be072f33e595f6e68f342835fe8fc77dcea0ba5c4fed9aaf92f [INFO] running `"docker" "start" "-a" "ee1dc1b150250be072f33e595f6e68f342835fe8fc77dcea0ba5c4fed9aaf92f"` [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] 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: 0x7fe86b0a128b - backtrace::backtrace::libunwind::trace::hbfb69e72f505529b [INFO] [stderr] at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/libunwind.rs:88 [INFO] [stderr] 1: 0x7fe86b0a128b - backtrace::backtrace::trace_unsynchronized::hac9ea77fa06b91bd [INFO] [stderr] at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/mod.rs:66 [INFO] [stderr] 2: 0x7fe86b0a128b - std::sys_common::backtrace::_print::hf6f722cabcf8c26d [INFO] [stderr] at src/libstd/sys_common/backtrace.rs:47 [INFO] [stderr] 3: 0x7fe86b0a128b - std::sys_common::backtrace::print::h9cca5983945bdb52 [INFO] [stderr] at src/libstd/sys_common/backtrace.rs:36 [INFO] [stderr] 4: 0x7fe86b0a128b - std::panicking::default_hook::{{closure}}::h2fab7259edc3a80d [INFO] [stderr] at src/libstd/panicking.rs:200 [INFO] [stderr] 5: 0x7fe86b0a0f67 - std::panicking::default_hook::ha99acf6d9268d46d [INFO] [stderr] at src/libstd/panicking.rs:214 [INFO] [stderr] 6: 0x7fe86ce6c3a1 - rustc::util::common::panic_hook::hfd44eedbf649ccc9 [INFO] [stderr] 7: 0x7fe86b0a1ae9 - std::panicking::rust_panic_with_hook::hddab2c65ce92e648 [INFO] [stderr] at src/libstd/panicking.rs:481 [INFO] [stderr] 8: 0x7fe86bf02315 - std::panicking::begin_panic::h856f1c48c16d5c48 [INFO] [stderr] 9: 0x7fe86becaa1d - rustc_borrowck::borrowck::check_loans::CheckLoanCtxt::report_error_if_loans_conflict::hb52bca5e439636ca [INFO] [stderr] 10: 0x7fe86beb61de - rustc_borrowck::dataflow::DataFlowContext::each_bit_on_entry::hcf6a6a1dc4aa7d9f [INFO] [stderr] 11: 0x7fe86bec9e10 - ::borrow::h4e693c417c611b84 [INFO] [stderr] 12: 0x7fe86cdaf6d2 - rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr::h4f7d4b7f1161d570 [INFO] [stderr] 13: 0x7fe86cdaed0a - rustc::middle::expr_use_visitor::ExprUseVisitor::consume_expr::h995f63b69366827f [INFO] [stderr] 14: 0x7fe86cdaffa3 - rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr::h4f7d4b7f1161d570 [INFO] [stderr] 15: 0x7fe86cdaed0a - rustc::middle::expr_use_visitor::ExprUseVisitor::consume_expr::h995f63b69366827f [INFO] [stderr] 16: 0x7fe86cdb07b8 - rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr::h4f7d4b7f1161d570 [INFO] [stderr] 17: 0x7fe86cdaed0a - rustc::middle::expr_use_visitor::ExprUseVisitor::consume_expr::h995f63b69366827f [INFO] [stderr] 18: 0x7fe86cdb0867 - rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr::h4f7d4b7f1161d570 [INFO] [stderr] 19: 0x7fe86cdaed0a - rustc::middle::expr_use_visitor::ExprUseVisitor::consume_expr::h995f63b69366827f [INFO] [stderr] 20: 0x7fe86beca704 - rustc_borrowck::borrowck::check_loans::check_loans::h7a8b04d9e9a0d504 [INFO] [stderr] 21: 0x7fe86bed7e05 - rustc_borrowck::borrowck::borrowck::hec4992d10cf455cc [INFO] [stderr] 22: 0x7fe86c0e442e - rustc::ty::query::__query_compute::borrowck::h96d93bc925281721 [INFO] [stderr] 23: 0x7fe86bf8c3cb - rustc::ty::query::::compute::h901765d26162e50a [INFO] [stderr] 24: 0x7fe86c11ae3a - rustc::dep_graph::graph::DepGraph::with_task_impl::h63528c86a2b3892d [INFO] [stderr] 25: 0x7fe86bfb726d - rustc::ty::query::plumbing::::get_query::h36d559fbed044113 [INFO] [stderr] 26: 0x7fe86c14d14c - rustc_mir::borrow_check::do_mir_borrowck::h558a1ef555035b17 [INFO] [stderr] 27: 0x7fe86c011406 - rustc::ty::context::GlobalCtxt::enter_local::h261cd3f33a7b67d8 [INFO] [stderr] 28: 0x7fe86c14a01e - rustc_mir::borrow_check::mir_borrowck::h2be8d37954df92d5 [INFO] [stderr] 29: 0x7fe86b70aca6 - rustc::ty::query::__query_compute::mir_borrowck::hb3fb648d4492f3f6 [INFO] [stderr] 30: 0x7fe86b6e237c - rustc::ty::query::::compute::hbec51c0bd6464421 [INFO] [stderr] 31: 0x7fe86b712064 - rustc::dep_graph::graph::DepGraph::with_task_impl::hce7f710cdf3246ba [INFO] [stderr] 32: 0x7fe86b6f896f - rustc::ty::query::plumbing::::get_query::hdf27014081c5b3be [INFO] [stderr] 33: 0x7fe86b6e2249 - rustc::ty::::par_body_owners::h803196552a070b21 [INFO] [stderr] 34: 0x7fe86b69fe6c - rustc::util::common::time::h6eeb9376272ba9e2 [INFO] [stderr] 35: 0x7fe86b65b5fd - rustc_interface::passes::analysis::h2726eeedd8e3ef6d [INFO] [stderr] 36: 0x7fe86b5df045 - rustc::ty::query::__query_compute::analysis::h4faf884cf1259c59 [INFO] [stderr] 37: 0x7fe86b5e1aed - rustc::dep_graph::graph::DepGraph::with_task_impl::he9a928ff48476dc8 [INFO] [stderr] 38: 0x7fe86b54d685 - rustc::ty::query::plumbing::::get_query::h6d1dc41a11943c1b [INFO] [stderr] 39: 0x7fe86b56aafa - rustc_interface::passes::BoxedGlobalCtxt::access::{{closure}}::h85c3fb047e0ea734 [INFO] [stderr] 40: 0x7fe86b6a375a - rustc_interface::passes::create_global_ctxt::{{closure}}::h1ffc2c2cc1d42db9 [INFO] [stderr] 41: 0x7fe86b56cd48 - rustc_interface::interface::run_compiler_in_existing_thread_pool::hc599896830aa45f0 [INFO] [stderr] 42: 0x7fe86b580d72 - std::thread::local::LocalKey::with::h4d212015ce009bcf [INFO] [stderr] 43: 0x7fe86b594591 - scoped_tls::ScopedKey::set::hcab917881710fa40 [INFO] [stderr] 44: 0x7fe86b5abfd4 - syntax::with_globals::h12befd00a88953f6 [INFO] [stderr] 45: 0x7fe86b5d620d - std::sys_common::backtrace::__rust_begin_short_backtrace::h835b1f49eccc9d0f [INFO] [stderr] 46: 0x7fe86b0b254a - __rust_maybe_catch_panic [INFO] [stderr] at src/libpanic_unwind/lib.rs:82 [INFO] [stderr] 47: 0x7fe86b553e79 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h5029e1cdef525373 [INFO] [stderr] 48: 0x7fe86b084ecf - as core::ops::function::FnOnce>::call_once::hb6b4aee4bf6a9868 [INFO] [stderr] at /rustc/18481b65f318e0b4b20c0fc61340054701719d6c/src/liballoc/boxed.rs:766 [INFO] [stderr] 49: 0x7fe86b0b1230 - as core::ops::function::FnOnce>::call_once::h6444d7d6451c501f [INFO] [stderr] at /rustc/18481b65f318e0b4b20c0fc61340054701719d6c/src/liballoc/boxed.rs:766 [INFO] [stderr] 50: 0x7fe86b0b1230 - std::sys_common::thread::start_thread::h855a2faecb3312a1 [INFO] [stderr] at src/libstd/sys_common/thread.rs:13 [INFO] [stderr] 51: 0x7fe86b0b1230 - std::sys::unix::thread::Thread::new::thread_start::hc7712c9a2aed5193 [INFO] [stderr] at src/libstd/sys/unix/thread.rs:79 [INFO] [stderr] 52: 0x7fe86ae234a4 - start_thread [INFO] [stderr] 53: 0x7fe86a759d0f - __clone [INFO] [stderr] 54: 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 1.38.0-nightly (18481b65f 2019-07-08) 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] error: Could not compile `rust_learning`. [INFO] [stderr] warning: build failed, waiting for other jobs to finish... [INFO] [stderr] 0: 0x7f233bb1128b - backtrace::backtrace::libunwind::trace::hbfb69e72f505529b [INFO] [stderr] at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/libunwind.rs:88 [INFO] [stderr] 1: 0x7f233bb1128b - backtrace::backtrace::trace_unsynchronized::hac9ea77fa06b91bd [INFO] [stderr] at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/mod.rs:66 [INFO] [stderr] 2: 0x7f233bb1128b - std::sys_common::backtrace::_print::hf6f722cabcf8c26d [INFO] [stderr] at src/libstd/sys_common/backtrace.rs:47 [INFO] [stderr] 3: 0x7f233bb1128b - std::sys_common::backtrace::print::h9cca5983945bdb52 [INFO] [stderr] at src/libstd/sys_common/backtrace.rs:36 [INFO] [stderr] 4: 0x7f233bb1128b - std::panicking::default_hook::{{closure}}::h2fab7259edc3a80d [INFO] [stderr] at src/libstd/panicking.rs:200 [INFO] [stderr] 5: 0x7f233bb10f67 - std::panicking::default_hook::ha99acf6d9268d46d [INFO] [stderr] at src/libstd/panicking.rs:214 [INFO] [stderr] 6: 0x7f233d8dc3a1 - rustc::util::common::panic_hook::hfd44eedbf649ccc9 [INFO] [stderr] 7: 0x7f233bb11ae9 - std::panicking::rust_panic_with_hook::hddab2c65ce92e648 [INFO] [stderr] at src/libstd/panicking.rs:481 [INFO] [stderr] 8: 0x7f233c972315 - std::panicking::begin_panic::h856f1c48c16d5c48 [INFO] [stderr] 9: 0x7f233c93aa1d - rustc_borrowck::borrowck::check_loans::CheckLoanCtxt::report_error_if_loans_conflict::hb52bca5e439636ca [INFO] [stderr] 10: 0x7f233c9261de - rustc_borrowck::dataflow::DataFlowContext::each_bit_on_entry::hcf6a6a1dc4aa7d9f [INFO] [stderr] 11: 0x7f233c939e10 - ::borrow::h4e693c417c611b84 [INFO] [stderr] 12: 0x7f233d81f6d2 - rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr::h4f7d4b7f1161d570 [INFO] [stderr] 13: 0x7f233d81ed0a - rustc::middle::expr_use_visitor::ExprUseVisitor::consume_expr::h995f63b69366827f [INFO] [stderr] 14: 0x7f233d81ffa3 - rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr::h4f7d4b7f1161d570 [INFO] [stderr] 15: 0x7f233d81ed0a - rustc::middle::expr_use_visitor::ExprUseVisitor::consume_expr::h995f63b69366827f [INFO] [stderr] 16: 0x7f233d8207b8 - rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr::h4f7d4b7f1161d570 [INFO] [stderr] 17: 0x7f233d81ed0a - rustc::middle::expr_use_visitor::ExprUseVisitor::consume_expr::h995f63b69366827f [INFO] [stderr] 18: 0x7f233d820867 - rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr::h4f7d4b7f1161d570 [INFO] [stderr] 19: 0x7f233d81ed0a - rustc::middle::expr_use_visitor::ExprUseVisitor::consume_expr::h995f63b69366827f [INFO] [stderr] 20: 0x7f233c93a704 - rustc_borrowck::borrowck::check_loans::check_loans::h7a8b04d9e9a0d504 [INFO] [stderr] 21: 0x7f233c947e05 - rustc_borrowck::borrowck::borrowck::hec4992d10cf455cc [INFO] [stderr] 22: 0x7f233cb5442e - rustc::ty::query::__query_compute::borrowck::h96d93bc925281721 [INFO] [stderr] 23: 0x7f233c9fc3cb - rustc::ty::query::::compute::h901765d26162e50a [INFO] [stderr] 24: 0x7f233cb8ae3a - rustc::dep_graph::graph::DepGraph::with_task_impl::h63528c86a2b3892d [INFO] [stderr] 25: 0x7f233ca2726d - rustc::ty::query::plumbing::::get_query::h36d559fbed044113 [INFO] [stderr] 26: 0x7f233cbbd14c - rustc_mir::borrow_check::do_mir_borrowck::h558a1ef555035b17 [INFO] [stderr] 27: 0x7f233ca81406 - rustc::ty::context::GlobalCtxt::enter_local::h261cd3f33a7b67d8 [INFO] [stderr] 28: 0x7f233cbba01e - rustc_mir::borrow_check::mir_borrowck::h2be8d37954df92d5 [INFO] [stderr] 29: 0x7f233c17aca6 - rustc::ty::query::__query_compute::mir_borrowck::hb3fb648d4492f3f6 [INFO] [stderr] 30: 0x7f233c15237c - rustc::ty::query::::compute::hbec51c0bd6464421 [INFO] [stderr] 31: 0x7f233c182064 - rustc::dep_graph::graph::DepGraph::with_task_impl::hce7f710cdf3246ba [INFO] [stderr] 32: 0x7f233c16896f - rustc::ty::query::plumbing::::get_query::hdf27014081c5b3be [INFO] [stderr] 33: 0x7f233c152249 - rustc::ty::::par_body_owners::h803196552a070b21 [INFO] [stderr] 34: 0x7f233c10fe6c - rustc::util::common::time::h6eeb9376272ba9e2 [INFO] [stderr] 35: 0x7f233c0cb5fd - rustc_interface::passes::analysis::h2726eeedd8e3ef6d [INFO] [stderr] 36: 0x7f233c04f045 - rustc::ty::query::__query_compute::analysis::h4faf884cf1259c59 [INFO] [stderr] 37: 0x7f233c051aed - rustc::dep_graph::graph::DepGraph::with_task_impl::he9a928ff48476dc8 [INFO] [stderr] 38: 0x7f233bfbd685 - rustc::ty::query::plumbing::::get_query::h6d1dc41a11943c1b [INFO] [stderr] 39: 0x7f233bfdaafa - rustc_interface::passes::BoxedGlobalCtxt::access::{{closure}}::h85c3fb047e0ea734 [INFO] [stderr] 40: 0x7f233c11375a - rustc_interface::passes::create_global_ctxt::{{closure}}::h1ffc2c2cc1d42db9 [INFO] [stderr] 41: 0x7f233bfdcd48 - rustc_interface::interface::run_compiler_in_existing_thread_pool::hc599896830aa45f0 [INFO] [stderr] 42: 0x7f233bff0d72 - std::thread::local::LocalKey::with::h4d212015ce009bcf [INFO] [stderr] 43: 0x7f233c004591 - scoped_tls::ScopedKey::set::hcab917881710fa40 [INFO] [stderr] 44: 0x7f233c01bfd4 - syntax::with_globals::h12befd00a88953f6 [INFO] [stderr] 45: 0x7f233c04620d - std::sys_common::backtrace::__rust_begin_short_backtrace::h835b1f49eccc9d0f [INFO] [stderr] 46: 0x7f233bb2254a - __rust_maybe_catch_panic [INFO] [stderr] at src/libpanic_unwind/lib.rs:82 [INFO] [stderr] 47: 0x7f233bfc3e79 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h5029e1cdef525373 [INFO] [stderr] 48: 0x7f233baf4ecf - as core::ops::function::FnOnce>::call_once::hb6b4aee4bf6a9868 [INFO] [stderr] at /rustc/18481b65f318e0b4b20c0fc61340054701719d6c/src/liballoc/boxed.rs:766 [INFO] [stderr] 49: 0x7f233bb21230 - as core::ops::function::FnOnce>::call_once::h6444d7d6451c501f [INFO] [stderr] at /rustc/18481b65f318e0b4b20c0fc61340054701719d6c/src/liballoc/boxed.rs:766 [INFO] [stderr] 50: 0x7f233bb21230 - std::sys_common::thread::start_thread::h855a2faecb3312a1 [INFO] [stderr] at src/libstd/sys_common/thread.rs:13 [INFO] [stderr] 51: 0x7f233bb21230 - std::sys::unix::thread::Thread::new::thread_start::hc7712c9a2aed5193 [INFO] [stderr] at src/libstd/sys/unix/thread.rs:79 [INFO] [stderr] 52: 0x7f233b8934a4 - start_thread [INFO] [stderr] 53: 0x7f233b1c9d0f - __clone [INFO] [stderr] 54: 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 1.38.0-nightly (18481b65f 2019-07-08) 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" "ee1dc1b150250be072f33e595f6e68f342835fe8fc77dcea0ba5c4fed9aaf92f"` [INFO] running `"docker" "rm" "-f" "ee1dc1b150250be072f33e595f6e68f342835fe8fc77dcea0ba5c4fed9aaf92f"` [INFO] [stdout] ee1dc1b150250be072f33e595f6e68f342835fe8fc77dcea0ba5c4fed9aaf92f