[INFO] cloning repository https://github.com/jestarray/core_window_letterbox
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jestarray/core_window_letterbox" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjestarray%2Fcore_window_letterbox", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjestarray%2Fcore_window_letterbox'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] abee49f5e014436d12576ab1605cfd985d74a2f3
[INFO] checking jestarray/core_window_letterbox against try#9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c for pr-79472
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjestarray%2Fcore_window_letterbox" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jestarray/core_window_letterbox on toolchain 9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/jestarray/core_window_letterbox
[INFO] finished tweaking git repo https://github.com/jestarray/core_window_letterbox
[INFO] tweaked toml for git repo https://github.com/jestarray/core_window_letterbox written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/jestarray/core_window_letterbox already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded qstring v0.7.0
[INFO] [stderr]   Downloaded ureq v0.11.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bafc4199bcbd866745b47134635ef704287c93a2d9e4183e213c946c3d4f3dea
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "bafc4199bcbd866745b47134635ef704287c93a2d9e4183e213c946c3d4f3dea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bafc4199bcbd866745b47134635ef704287c93a2d9e4183e213c946c3d4f3dea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bafc4199bcbd866745b47134635ef704287c93a2d9e4183e213c946c3d4f3dea", kill_on_drop: false }`
[INFO] [stdout] bafc4199bcbd866745b47134635ef704287c93a2d9e4183e213c946c3d4f3dea
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d076d424985acbe4d66d4e80033552e8ac3c0897850de62529901ffb495297d5
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "d076d424985acbe4d66d4e80033552e8ac3c0897850de62529901ffb495297d5", kill_on_drop: false }`
[INFO] [stderr]    Compiling matches v0.1.8
[INFO] [stderr]    Compiling smallvec v1.1.0
[INFO] [stderr]    Compiling untrusted v0.7.0
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling spin v0.5.2
[INFO] [stderr]    Compiling cfg-if v0.1.10
[INFO] [stderr]    Compiling byteorder v1.3.2
[INFO] [stderr]    Compiling percent-encoding v1.0.1
[INFO] [stderr]    Compiling percent-encoding v2.1.0
[INFO] [stderr]    Compiling chunked_transfer v1.0.0
[INFO] [stderr]    Compiling base64 v0.11.0
[INFO] [stderr]    Compiling libc v0.2.66
[INFO] [stderr]    Compiling ring v0.16.9
[INFO] [stderr]    Compiling miniz-sys v0.1.12
[INFO] [stderr]    Compiling cmake v0.1.42
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]    Compiling unicode-bidi v0.3.4
[INFO] [stderr]    Compiling qstring v0.7.0
[INFO] [stderr]    Compiling unicode-normalization v0.1.11
[INFO] [stderr]    Compiling time v0.1.42
[INFO] [stderr]    Compiling xattr v0.2.2
[INFO] [stderr]    Compiling filetime v0.2.8
[INFO] [stderr]    Compiling flate2 v0.2.20
[INFO] [stderr]    Compiling tar v0.4.26
[INFO] [stderr]    Compiling base64 v0.10.1
[INFO] [stderr]    Compiling idna v0.1.5
[INFO] [stderr]    Compiling idna v0.2.0
[INFO] [stderr]    Compiling url v1.7.2
[INFO] [stderr] thread 'rustc' panicked at 'assertion failed: `(left == right)`
[INFO] [stderr]   left: `DefId(0:1310 ~ ring[1a64]::digest::sha2::)`,
[INFO] [stderr]  right: `DefId(0:1311 ~ ring[1a64]::digest::sha2::::GFp_sha256_block_data_order)`', compiler/rustc_middle/src/hir/map/collector.rs:227:13
[INFO] [stderr] stack backtrace:
[INFO] [stderr]    0:     0x7f344b458e30 - std::backtrace_rs::backtrace::libunwind::trace::h746c3e9529d524bc
[INFO] [stderr]                                at /rustc/9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c/library/std/src/../../backtrace/src/backtrace/libunwind.rs:90:5
[INFO] [stderr]    1:     0x7f344b458e30 - std::backtrace_rs::backtrace::trace_unsynchronized::h86340908ff889faa
[INFO] [stderr]                                at /rustc/9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
[INFO] [stderr]    2:     0x7f344b458e30 - std::sys_common::backtrace::_print_fmt::h43f85f9b18230404
[INFO] [stderr]                                at /rustc/9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c/library/std/src/sys_common/backtrace.rs:67:5
[INFO] [stderr]    3:     0x7f344b458e30 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hc132ae1a5b5aa7cd
[INFO] [stderr]                                at /rustc/9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c/library/std/src/sys_common/backtrace.rs:46:22
[INFO] [stderr]    4:     0x7f344b4cbbfc - core::fmt::write::hdf023a0036d2a25f
[INFO] [stderr]                                at /rustc/9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c/library/core/src/fmt/mod.rs:1078:17
[INFO] [stderr]    5:     0x7f344b44a9a2 - std::io::Write::write_fmt::h8580846154bcb66a
[INFO] [stderr]                                at /rustc/9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c/library/std/src/io/mod.rs:1519:15
[INFO] [stderr]    6:     0x7f344b45ca95 - std::sys_common::backtrace::_print::h7ee55fed88d107a3
[INFO] [stderr]                                at /rustc/9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c/library/std/src/sys_common/backtrace.rs:49:5
[INFO] [stderr]    7:     0x7f344b45ca95 - std::sys_common::backtrace::print::h54a7d3e52a524177
[INFO] [stderr]                                at /rustc/9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c/library/std/src/sys_common/backtrace.rs:36:9
[INFO] [stderr]    8:     0x7f344b45ca95 - std::panicking::default_hook::{{closure}}::h60921e857bf55a40
[INFO] [stderr]                                at /rustc/9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c/library/std/src/panicking.rs:208:50
[INFO] [stderr]    9:     0x7f344b45c5ea - std::panicking::default_hook::hf0f9afb1017317fc
[INFO] [stderr]                                at /rustc/9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c/library/std/src/panicking.rs:225:9
[INFO] [stderr]    Compiling url v2.1.1
[INFO] [stderr]   10:     0x7f344bcece88 - rustc_driver::report_ice::ha25ae86a5858acc3
[INFO] [stderr]   11:     0x7f344b45d396 - std::panicking::rust_panic_with_hook::h8d66bf42b407aaea
[INFO] [stderr]                                at /rustc/9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c/library/std/src/panicking.rs:595:17
[INFO] [stderr]   12:     0x7f344b45ceb7 - std::panicking::begin_panic_handler::{{closure}}::hde71edcd925d0c5e
[INFO] [stderr]                                at /rustc/9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c/library/std/src/panicking.rs:497:13
[INFO] [stderr]   13:     0x7f344b4592ec - std::sys_common::backtrace::__rust_end_short_backtrace::h8a3c7d6cea578919
[INFO] [stderr]                                at /rustc/9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c/library/std/src/sys_common/backtrace.rs:141:18
[INFO] [stderr]   14:     0x7f344b45ce19 - rust_begin_unwind
[INFO] [stderr]                                at /rustc/9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c/library/std/src/panicking.rs:493:5
[INFO] [stderr]   15:     0x7f344b4c7fe1 - core::panicking::panic_fmt::h20225113c4a2f8fd
[INFO] [stderr]                                at /rustc/9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c/library/core/src/panicking.rs:92:14
[INFO] [stderr]   16:     0x7f344ea7f692 - rustc_middle::hir::map::collector::NodeCollector::insert_entry::hca669a46f64fdb43
[INFO] [stderr]   17:     0x7f344e6691d5 - rustc_hir::intravisit::walk_item::hc46606fd2b20aa7f
[INFO] [stderr]   18:     0x7f344ea7fb15 - <rustc_middle::hir::map::collector::NodeCollector as rustc_hir::intravisit::Visitor>::visit_item::h0f587429024a5cb5
[INFO] [stderr]   19:     0x7f344e669116 - rustc_hir::intravisit::walk_item::hc46606fd2b20aa7f
[INFO] [stderr]   20:     0x7f344ea7fb15 - <rustc_middle::hir::map::collector::NodeCollector as rustc_hir::intravisit::Visitor>::visit_item::h0f587429024a5cb5
[INFO] [stderr]   21:     0x7f344e669116 - rustc_hir::intravisit::walk_item::hc46606fd2b20aa7f
[INFO] [stderr]   22:     0x7f344ea7fb15 - <rustc_middle::hir::map::collector::NodeCollector as rustc_hir::intravisit::Visitor>::visit_item::h0f587429024a5cb5
[INFO] [stderr]   23:     0x7f344e81f0b8 - rustc_middle::hir::map::index_hir::hf439917ce696bd94
[INFO] [stderr]   24:     0x7f344ece8396 - rustc_query_system::dep_graph::graph::DepGraph<K>::with_eval_always_task::h8bd29a88a93658cd
[INFO] [stderr]   25:     0x7f344e8eca9e - rustc_data_structures::stack::ensure_sufficient_stack::h342dc757722bd1db
[INFO] [stderr]   26:     0x7f344eb87e2f - rustc_query_system::query::plumbing::get_query_impl::hb09330ad44d3182c
[INFO] [stderr]   27:     0x7f344e92e7cd - core::ops::function::FnOnce::call_once::h5a7eb1d6379c8762
[INFO] [stderr]   28:     0x7f344ececf26 - rustc_query_system::dep_graph::graph::DepGraph<K>::with_eval_always_task::h9f649dad743b6654
[INFO] [stderr]   29:     0x7f344e8f5c8e - rustc_data_structures::stack::ensure_sufficient_stack::h7d600bd62a1740c1
[INFO] [stderr]   30:     0x7f344eb6030e - rustc_query_system::query::plumbing::get_query_impl::h8f65053f4158eee3
[INFO] [stderr]   31:     0x7f344e81c2e3 - rustc_middle::hir::map::Map::expect_item::hfd87383e47c97d54
[INFO] [stderr]   32:     0x7f344cd8232e - rustc_middle::hir::map::Map::visit_item_likes_in_module::h247672bea00725ec
[INFO] [stderr]   33:     0x7f344cda214c - rustc_passes::hir_id_validator::check_crate::h59836737852b1597
[INFO] [stderr]   34:     0x7f344bf4ad22 - rustc_interface::passes::analysis::h342855b4d8ce9897
[INFO] [stderr]   35:     0x7f344bca99ab - rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::analysis>::compute::h95ff81a8a73eaff3
[INFO] [stderr]   36:     0x7f344bd3acd6 - rustc_query_system::dep_graph::graph::DepGraph<K>::with_eval_always_task::h9b1ab6f92ac4abd3
[INFO] [stderr]   37:     0x7f344bd4a206 - rustc_data_structures::stack::ensure_sufficient_stack::hd767cf5f976dec26
[INFO] [stderr]   38:     0x7f344bcd75a4 - rustc_query_system::query::plumbing::get_query_impl::h59cb47161047ab66
[INFO] [stderr]   39:     0x7f344bcac07b - rustc_interface::passes::QueryContext::enter::heace2ac35bf577de
[INFO] [stderr]   40:     0x7f344bd474a5 - rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter::hcfd2504bb4e8d292
[INFO] [stderr]   41:     0x7f344bd15797 - rustc_span::with_source_map::hdf17fa3a4d8fe35b
[INFO] [stderr]   42:     0x7f344bd438cc - scoped_tls::ScopedKey<T>::set::h5dca480b178bbfab
[INFO] [stderr]   43:     0x7f344bd4a9e5 - std::sys_common::backtrace::__rust_begin_short_backtrace::ha4cbf96baa7e4912
[INFO] [stderr]   44:     0x7f344bcb35ca - core::ops::function::FnOnce::call_once{{vtable.shim}}::he2d69591c700ddc8
[INFO] [stderr]   45:     0x7f344b46c65a - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hea1090dbdcecbf5a
[INFO] [stderr]                                at /rustc/9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c/library/alloc/src/boxed.rs:1318:9
[INFO] [stderr]   46:     0x7f344b46c65a - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h8d5723d3912bd325
[INFO] [stderr]                                at /rustc/9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c/library/alloc/src/boxed.rs:1318:9
[INFO] [stderr]   47:     0x7f344b46c65a - std::sys::unix::thread::Thread::new::thread_start::hc17a425ca2995724
[INFO] [stderr]                                at /rustc/9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c/library/std/src/sys/unix/thread.rs:71:17
[INFO] [stderr]   48:     0x7f344b384609 - start_thread
[INFO] [stderr]   49:     0x7f344b298293 - clone
[INFO] [stderr]   50:                0x0 - <unknown>
[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/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md
[INFO] [stderr] 
[INFO] [stderr] note: rustc 1.50.0-nightly (9b49d8c6c 2020-11-27) running on x86_64-unknown-linux-gnu
[INFO] [stderr] 
[INFO] [stderr] note: compiler flags: -C embed-bitcode=no -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] query stack during panic:
[INFO] [stderr] #0 [index_hir] index HIR
[INFO] [stderr] #1 [hir_owner] HIR owner of `{misc#0}`
[INFO] [stderr] #2 [analysis] running analysis passes on this crate
[INFO] [stderr] end of query stack
[INFO] [stderr] error: could not compile `ring`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "d076d424985acbe4d66d4e80033552e8ac3c0897850de62529901ffb495297d5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d076d424985acbe4d66d4e80033552e8ac3c0897850de62529901ffb495297d5", kill_on_drop: false }`
[INFO] [stdout] d076d424985acbe4d66d4e80033552e8ac3c0897850de62529901ffb495297d5