[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 master#78ca1bda3522b14bc0336bc01dd1d49fdba2cda7 for pr-62507 [INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-62507/worker-7/master#78ca1bda3522b14bc0336bc01dd1d49fdba2cda7:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-62507/sources/master#78ca1bda3522b14bc0336bc01dd1d49fdba2cda7/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" "+78ca1bda3522b14bc0336bc01dd1d49fdba2cda7-alt" "check" "--frozen" "--all" "--all-targets"` [INFO] [stdout] 0c7fad5cd97d3e50417e38ccbda38d234dc7d040902cd513521039eea468c234 [INFO] running `"docker" "start" "-a" "0c7fad5cd97d3e50417e38ccbda38d234dc7d040902cd513521039eea468c234"` [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: 0x7f322445023b - backtrace::backtrace::libunwind::trace::h4f04af92f39f2b78 [INFO] [stderr] at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/libunwind.rs:88 [INFO] [stderr] 1: 0x7f322445023b - backtrace::backtrace::trace_unsynchronized::hb28ce8d2b7fb3e31 [INFO] [stderr] at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/mod.rs:66 [INFO] [stderr] 2: 0x7f322445023b - std::sys_common::backtrace::_print::he3f49d2d13a51ff1 [INFO] [stderr] at src/libstd/sys_common/backtrace.rs:47 [INFO] [stderr] 3: 0x7f322445023b - std::sys_common::backtrace::print::h46c2f3b13519e9bf [INFO] [stderr] at src/libstd/sys_common/backtrace.rs:36 [INFO] [stderr] 4: 0x7f322445023b - std::panicking::default_hook::{{closure}}::h6694acddafc67583 [INFO] [stderr] at src/libstd/panicking.rs:200 [INFO] [stderr] 5: 0x7f322444ff17 - std::panicking::default_hook::hb4761d2feeb6d93c [INFO] [stderr] at src/libstd/panicking.rs:214 [INFO] [stderr] 6: 0x7f3226215ab1 - rustc::util::common::panic_hook::h048f1ff4bc2b561b [INFO] [stderr] 7: 0x7f3224450a99 - std::panicking::rust_panic_with_hook::h7a5f9620b0a832bc [INFO] [stderr] at src/libstd/panicking.rs:481 [INFO] [stderr] 8: 0x7f32252aa9e5 - std::panicking::begin_panic::h914a2eb15fd482b7 [INFO] [stderr] 9: 0x7f32252730cd - rustc_borrowck::borrowck::check_loans::CheckLoanCtxt::report_error_if_loans_conflict::hc71a481133fbb09a [INFO] [stderr] 10: 0x7f322525dbce - rustc_borrowck::dataflow::DataFlowContext::each_bit_on_entry::h6247d51942aa9431 [INFO] [stderr] 11: 0x7f32252724c0 - ::borrow::h4733bda9fc3532fc [INFO] [stderr] 12: 0x7f3226158c02 - rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr::h31673a8e3bb0291f [INFO] [stderr] 13: 0x7f322615823a - rustc::middle::expr_use_visitor::ExprUseVisitor::consume_expr::h2f423179c40056f0 [INFO] [stderr] 14: 0x7f32261594d3 - rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr::h31673a8e3bb0291f [INFO] [stderr] 15: 0x7f322615823a - rustc::middle::expr_use_visitor::ExprUseVisitor::consume_expr::h2f423179c40056f0 [INFO] [stderr] 16: 0x7f3226159ce8 - rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr::h31673a8e3bb0291f [INFO] [stderr] 17: 0x7f322615823a - rustc::middle::expr_use_visitor::ExprUseVisitor::consume_expr::h2f423179c40056f0 [INFO] [stderr] 18: 0x7f3226159d97 - rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr::h31673a8e3bb0291f [INFO] [stderr] 19: 0x7f322615823a - rustc::middle::expr_use_visitor::ExprUseVisitor::consume_expr::h2f423179c40056f0 [INFO] [stderr] 20: 0x7f3225272db4 - rustc_borrowck::borrowck::check_loans::check_loans::h89c20aca8b39ea8a [INFO] [stderr] 21: 0x7f32252804b5 - rustc_borrowck::borrowck::borrowck::h2d6f2ec2ab014daf [INFO] [stderr] 22: 0x7f322548c8ce - rustc::ty::query::__query_compute::borrowck::hcc586f31bf624aab [INFO] [stderr] 23: 0x7f322533489b - rustc::ty::query::::compute::h012c002b27943726 [INFO] [stderr] 24: 0x7f32254c77ea - rustc::dep_graph::graph::DepGraph::with_task_impl::h8c2b34c83e47f5b9 [INFO] [stderr] 25: 0x7f322534e62d - rustc::ty::query::plumbing::::get_query::h1527d1348e338e25 [INFO] [stderr] 26: 0x7f32254f567c - rustc_mir::borrow_check::do_mir_borrowck::hcc7aa9d725279b59 [INFO] [stderr] 27: 0x7f32253b8e16 - rustc::ty::context::GlobalCtxt::enter_local::h13bd3686812dfa4e [INFO] [stderr] 28: 0x7f32254f254e - rustc_mir::borrow_check::mir_borrowck::h66f54efa008bf946 [INFO] [stderr] 29: 0x7f3224ab6c66 - rustc::ty::query::__query_compute::mir_borrowck::hea950c290a062aa3 [INFO] [stderr] 30: 0x7f3224a8e6fc - rustc::ty::query::::compute::h79f2aa5df3efe05e [INFO] [stderr] 31: 0x7f3224abe024 - rustc::dep_graph::graph::DepGraph::with_task_impl::hf106502afef77191 [INFO] [stderr] 32: 0x7f3224aa0f2f - rustc::ty::query::plumbing::::get_query::ha0d26acf93bdb49e [INFO] [stderr] 33: 0x7f3224a8e459 - rustc::ty::::par_body_owners::h0c84603cccc00669 [INFO] [stderr] 34: 0x7f3224a4ca9c - rustc::util::common::time::h7b23f5e084835274 [INFO] [stderr] 35: 0x7f3224a087ed - rustc_interface::passes::analysis::hcc2364d20e32d836 [INFO] [stderr] 36: 0x7f322498cf05 - rustc::ty::query::__query_compute::analysis::hb6494d9db9853dcd [INFO] [stderr] 37: 0x7f322498f37d - rustc::dep_graph::graph::DepGraph::with_task_impl::hc526faaa29e0549a [INFO] [stderr] 38: 0x7f32248fc525 - rustc::ty::query::plumbing::::get_query::hc2ff9ebdf5b52ec2 [INFO] [stderr] 39: 0x7f322491999a - rustc_interface::passes::BoxedGlobalCtxt::access::{{closure}}::h14f5a411e02f867a [INFO] [stderr] 40: 0x7f3224a5032a - rustc_interface::passes::create_global_ctxt::{{closure}}::h373e0b54add389be [INFO] [stderr] 41: 0x7f322491c4a8 - rustc_interface::interface::run_compiler_in_existing_thread_pool::he615c75133ce557e [INFO] [stderr] 42: 0x7f322492f9e2 - std::thread::local::LocalKey::with::h01d8730b937bafe6 [INFO] [stderr] 43: 0x7f3224942c61 - scoped_tls::ScopedKey::set::h93202ef68249584c [INFO] [stderr] 44: 0x7f322495a7e4 - syntax::with_globals::hec7bd40bfbb002de [INFO] [stderr] 45: 0x7f322498439d - std::sys_common::backtrace::__rust_begin_short_backtrace::h1b4bf6169be40163 [INFO] [stderr] 46: 0x7f32244614fa - __rust_maybe_catch_panic [INFO] [stderr] at src/libpanic_unwind/lib.rs:82 [INFO] [stderr] 47: 0x7f3224902fd9 - core::ops::function::FnOnce::call_once{{vtable.shim}}::hb217ce5152f7b02c [INFO] [stderr] 48: 0x7f3224433e7f - as core::ops::function::FnOnce>::call_once::h352281c34878505f [INFO] [stderr] at /rustc/78ca1bda3522b14bc0336bc01dd1d49fdba2cda7/src/liballoc/boxed.rs:766 [INFO] [stderr] 49: 0x7f32244601e0 - as core::ops::function::FnOnce>::call_once::h77507a97b5d0b6ca [INFO] [stderr] at /rustc/78ca1bda3522b14bc0336bc01dd1d49fdba2cda7/src/liballoc/boxed.rs:766 [INFO] [stderr] 50: 0x7f32244601e0 - std::sys_common::thread::start_thread::h8e874688d93a6d97 [INFO] [stderr] at src/libstd/sys_common/thread.rs:13 [INFO] [stderr] 51: 0x7f32244601e0 - std::sys::unix::thread::Thread::new::thread_start::hbfd3b1248521427e [INFO] [stderr] at src/libstd/sys/unix/thread.rs:79 [INFO] [stderr] 52: 0x7f32241d24a4 - start_thread [INFO] [stderr] 53: 0x7f3223b08d0f - __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 (78ca1bda3 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] warning: build failed, waiting for other jobs to finish... [INFO] [stderr] 0: 0x7f8cdb3dc23b - backtrace::backtrace::libunwind::trace::h4f04af92f39f2b78 [INFO] [stderr] at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/libunwind.rs:88 [INFO] [stderr] 1: 0x7f8cdb3dc23b - backtrace::backtrace::trace_unsynchronized::hb28ce8d2b7fb3e31 [INFO] [stderr] at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/mod.rs:66 [INFO] [stderr] 2: 0x7f8cdb3dc23b - std::sys_common::backtrace::_print::he3f49d2d13a51ff1 [INFO] [stderr] at src/libstd/sys_common/backtrace.rs:47 [INFO] [stderr] 3: 0x7f8cdb3dc23b - std::sys_common::backtrace::print::h46c2f3b13519e9bf [INFO] [stderr] at src/libstd/sys_common/backtrace.rs:36 [INFO] [stderr] 4: 0x7f8cdb3dc23b - std::panicking::default_hook::{{closure}}::h6694acddafc67583 [INFO] [stderr] at src/libstd/panicking.rs:200 [INFO] [stderr] 5: 0x7f8cdb3dbf17 - std::panicking::default_hook::hb4761d2feeb6d93c [INFO] [stderr] at src/libstd/panicking.rs:214 [INFO] [stderr] 6: 0x7f8cdd1a1ab1 - rustc::util::common::panic_hook::h048f1ff4bc2b561b [INFO] [stderr] 7: 0x7f8cdb3dca99 - std::panicking::rust_panic_with_hook::h7a5f9620b0a832bc [INFO] [stderr] at src/libstd/panicking.rs:481 [INFO] [stderr] 8: 0x7f8cdc2369e5 - std::panicking::begin_panic::h914a2eb15fd482b7 [INFO] [stderr] 9: 0x7f8cdc1ff0cd - rustc_borrowck::borrowck::check_loans::CheckLoanCtxt::report_error_if_loans_conflict::hc71a481133fbb09a [INFO] [stderr] 10: 0x7f8cdc1e9bce - rustc_borrowck::dataflow::DataFlowContext::each_bit_on_entry::h6247d51942aa9431 [INFO] [stderr] 11: 0x7f8cdc1fe4c0 - ::borrow::h4733bda9fc3532fc [INFO] [stderr] 12: 0x7f8cdd0e4c02 - rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr::h31673a8e3bb0291f [INFO] [stderr] 13: 0x7f8cdd0e423a - rustc::middle::expr_use_visitor::ExprUseVisitor::consume_expr::h2f423179c40056f0 [INFO] [stderr] 14: 0x7f8cdd0e54d3 - rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr::h31673a8e3bb0291f [INFO] [stderr] 15: 0x7f8cdd0e423a - rustc::middle::expr_use_visitor::ExprUseVisitor::consume_expr::h2f423179c40056f0 [INFO] [stderr] 16: 0x7f8cdd0e5ce8 - rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr::h31673a8e3bb0291f [INFO] [stderr] 17: 0x7f8cdd0e423a - rustc::middle::expr_use_visitor::ExprUseVisitor::consume_expr::h2f423179c40056f0 [INFO] [stderr] 18: 0x7f8cdd0e5d97 - rustc::middle::expr_use_visitor::ExprUseVisitor::walk_expr::h31673a8e3bb0291f [INFO] [stderr] 19: 0x7f8cdd0e423a - rustc::middle::expr_use_visitor::ExprUseVisitor::consume_expr::h2f423179c40056f0 [INFO] [stderr] 20: 0x7f8cdc1fedb4 - rustc_borrowck::borrowck::check_loans::check_loans::h89c20aca8b39ea8a [INFO] [stderr] 21: 0x7f8cdc20c4b5 - rustc_borrowck::borrowck::borrowck::h2d6f2ec2ab014daf [INFO] [stderr] 22: 0x7f8cdc4188ce - rustc::ty::query::__query_compute::borrowck::hcc586f31bf624aab [INFO] [stderr] 23: 0x7f8cdc2c089b - rustc::ty::query::::compute::h012c002b27943726 [INFO] [stderr] 24: 0x7f8cdc4537ea - rustc::dep_graph::graph::DepGraph::with_task_impl::h8c2b34c83e47f5b9 [INFO] [stderr] 25: 0x7f8cdc2da62d - rustc::ty::query::plumbing::::get_query::h1527d1348e338e25 [INFO] [stderr] 26: 0x7f8cdc48167c - rustc_mir::borrow_check::do_mir_borrowck::hcc7aa9d725279b59 [INFO] [stderr] 27: 0x7f8cdc344e16 - rustc::ty::context::GlobalCtxt::enter_local::h13bd3686812dfa4e [INFO] [stderr] 28: 0x7f8cdc47e54e - rustc_mir::borrow_check::mir_borrowck::h66f54efa008bf946 [INFO] [stderr] 29: 0x7f8cdba42c66 - rustc::ty::query::__query_compute::mir_borrowck::hea950c290a062aa3 [INFO] [stderr] 30: 0x7f8cdba1a6fc - rustc::ty::query::::compute::h79f2aa5df3efe05e [INFO] [stderr] 31: 0x7f8cdba4a024 - rustc::dep_graph::graph::DepGraph::with_task_impl::hf106502afef77191 [INFO] [stderr] 32: 0x7f8cdba2cf2f - rustc::ty::query::plumbing::::get_query::ha0d26acf93bdb49e [INFO] [stderr] 33: 0x7f8cdba1a459 - rustc::ty::::par_body_owners::h0c84603cccc00669 [INFO] [stderr] 34: 0x7f8cdb9d8a9c - rustc::util::common::time::h7b23f5e084835274 [INFO] [stderr] 35: 0x7f8cdb9947ed - rustc_interface::passes::analysis::hcc2364d20e32d836 [INFO] [stderr] 36: 0x7f8cdb918f05 - rustc::ty::query::__query_compute::analysis::hb6494d9db9853dcd [INFO] [stderr] 37: 0x7f8cdb91b37d - rustc::dep_graph::graph::DepGraph::with_task_impl::hc526faaa29e0549a [INFO] [stderr] 38: 0x7f8cdb888525 - rustc::ty::query::plumbing::::get_query::hc2ff9ebdf5b52ec2 [INFO] [stderr] 39: 0x7f8cdb8a599a - rustc_interface::passes::BoxedGlobalCtxt::access::{{closure}}::h14f5a411e02f867a [INFO] [stderr] 40: 0x7f8cdb9dc32a - rustc_interface::passes::create_global_ctxt::{{closure}}::h373e0b54add389be [INFO] [stderr] 41: 0x7f8cdb8a84a8 - rustc_interface::interface::run_compiler_in_existing_thread_pool::he615c75133ce557e [INFO] [stderr] 42: 0x7f8cdb8bb9e2 - std::thread::local::LocalKey::with::h01d8730b937bafe6 [INFO] [stderr] 43: 0x7f8cdb8cec61 - scoped_tls::ScopedKey::set::h93202ef68249584c [INFO] [stderr] 44: 0x7f8cdb8e67e4 - syntax::with_globals::hec7bd40bfbb002de [INFO] [stderr] 45: 0x7f8cdb91039d - std::sys_common::backtrace::__rust_begin_short_backtrace::h1b4bf6169be40163 [INFO] [stderr] 46: 0x7f8cdb3ed4fa - __rust_maybe_catch_panic [INFO] [stderr] at src/libpanic_unwind/lib.rs:82 [INFO] [stderr] 47: 0x7f8cdb88efd9 - core::ops::function::FnOnce::call_once{{vtable.shim}}::hb217ce5152f7b02c [INFO] [stderr] 48: 0x7f8cdb3bfe7f - as core::ops::function::FnOnce>::call_once::h352281c34878505f [INFO] [stderr] at /rustc/78ca1bda3522b14bc0336bc01dd1d49fdba2cda7/src/liballoc/boxed.rs:766 [INFO] [stderr] 49: 0x7f8cdb3ec1e0 - as core::ops::function::FnOnce>::call_once::h77507a97b5d0b6ca [INFO] [stderr] at /rustc/78ca1bda3522b14bc0336bc01dd1d49fdba2cda7/src/liballoc/boxed.rs:766 [INFO] [stderr] 50: 0x7f8cdb3ec1e0 - std::sys_common::thread::start_thread::h8e874688d93a6d97 [INFO] [stderr] at src/libstd/sys_common/thread.rs:13 [INFO] [stderr] 51: 0x7f8cdb3ec1e0 - std::sys::unix::thread::Thread::new::thread_start::hbfd3b1248521427e [INFO] [stderr] at src/libstd/sys/unix/thread.rs:79 [INFO] [stderr] 52: 0x7f8cdb15e4a4 - start_thread [INFO] [stderr] 53: 0x7f8cdaa94d0f - __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 (78ca1bda3 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] [INFO] [stderr] To learn more, run the command again with --verbose. [INFO] running `"docker" "inspect" "0c7fad5cd97d3e50417e38ccbda38d234dc7d040902cd513521039eea468c234"` [INFO] running `"docker" "rm" "-f" "0c7fad5cd97d3e50417e38ccbda38d234dc7d040902cd513521039eea468c234"` [INFO] [stdout] 0c7fad5cd97d3e50417e38ccbda38d234dc7d040902cd513521039eea468c234