[INFO] cloning repository https://github.com/nilern/BFG
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/nilern/BFG" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnilern%2FBFG", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnilern%2FBFG'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 768fda7e741ef0c3cb70a7f5787a675178cb60e3
[INFO] checking nilern/BFG against master#5e3f1b148db5bfa27fee52464ae1f5d34c49d77b for pr-75502
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnilern%2FBFG" "/workspace/builds/worker-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/nilern/BFG on toolchain 5e3f1b148db5bfa27fee52464ae1f5d34c49d77b
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/nilern/BFG
[INFO] finished tweaking git repo https://github.com/nilern/BFG
[INFO] tweaked toml for git repo https://github.com/nilern/BFG written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/nilern/BFG already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ab8113e9619ac5a164818ce10190d8a5334a61b14e98bc0b377f08db5330790e
[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" "ab8113e9619ac5a164818ce10190d8a5334a61b14e98bc0b377f08db5330790e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ab8113e9619ac5a164818ce10190d8a5334a61b14e98bc0b377f08db5330790e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ab8113e9619ac5a164818ce10190d8a5334a61b14e98bc0b377f08db5330790e", kill_on_drop: false }`
[INFO] [stdout] ab8113e9619ac5a164818ce10190d8a5334a61b14e98bc0b377f08db5330790e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 26b2d4e90379af2ba4be80bb7c85f019c507b218d7b6e5f5523273405323281a
[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" "26b2d4e90379af2ba4be80bb7c85f019c507b218d7b6e5f5523273405323281a", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.68
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]    Compiling proc-macro2 v1.0.9
[INFO] [stderr]     Checking ucd-util v0.1.8
[INFO] [stderr]    Compiling syn v1.0.16
[INFO] [stderr]    Compiling nix v0.14.1
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]     Checking utf8-ranges v1.0.4
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]     Checking unicode-segmentation v1.6.0
[INFO] [stderr]     Checking lazy_static v0.2.11
[INFO] [stderr]    Compiling owning_ref v0.4.1
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]     Checking regex-syntax v0.5.6
[INFO] [stderr]     Checking aho-corasick v0.6.10
[INFO] [stderr]    Compiling quote v1.0.3
[INFO] [stderr]     Checking dirs-sys v0.3.4
[INFO] [stderr]     Checking memmap v0.7.0
[INFO] [stderr]     Checking dirs v2.0.2
[INFO] [stderr]     Checking dynasmrt v0.6.0
[INFO] [stderr]     Checking regex v0.2.11
[INFO] [stderr]     Checking docopt v0.7.0
[INFO] [stderr]     Checking rustyline v6.0.0
[INFO] [stderr]    Compiling dynasm v0.6.0
[INFO] [stderr] thread 'rustc' panicked at 'called `Option::unwrap()` on a `None` value', src/librustc_mir/transform/match_branches.rs:54:81
[INFO] [stderr] stack backtrace:
[INFO] [stderr]    0:     0x7f6234d86200 - std::backtrace_rs::backtrace::libunwind::trace::ha1eabb142084ea37
[INFO] [stderr]                                at /rustc/5e3f1b148db5bfa27fee52464ae1f5d34c49d77b/library/std/src/../../backtrace/src/backtrace/libunwind.rs:96
[INFO] [stderr]    1:     0x7f6234d86200 - std::backtrace_rs::backtrace::trace_unsynchronized::hbb8825661d997281
[INFO] [stderr]                                at /rustc/5e3f1b148db5bfa27fee52464ae1f5d34c49d77b/library/std/src/../../backtrace/src/backtrace/mod.rs:66
[INFO] [stderr]    2:     0x7f6234d86200 - std::sys_common::backtrace::_print_fmt::h26d850e2f7183914
[INFO] [stderr]                                at /rustc/5e3f1b148db5bfa27fee52464ae1f5d34c49d77b/library/std/src/sys_common/backtrace.rs:79
[INFO] [stderr]    3:     0x7f6234d86200 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h3834b06f68a2b012
[INFO] [stderr]                                at /rustc/5e3f1b148db5bfa27fee52464ae1f5d34c49d77b/library/std/src/sys_common/backtrace.rs:58
[INFO] [stderr]    4:     0x7f6234df615c - core::fmt::write::h3a043650ba7bf668
[INFO] [stderr]                                at /rustc/5e3f1b148db5bfa27fee52464ae1f5d34c49d77b/library/core/src/fmt/mod.rs:1117
[INFO] [stderr]    5:     0x7f6234d78df5 - std::io::Write::write_fmt::h9c0c8944a1898139
[INFO] [stderr]                                at /rustc/5e3f1b148db5bfa27fee52464ae1f5d34c49d77b/library/std/src/io/mod.rs:1510
[INFO] [stderr]    6:     0x7f6234d8acb0 - std::sys_common::backtrace::_print::h693c0c2cc41d4d10
[INFO] [stderr]                                at /rustc/5e3f1b148db5bfa27fee52464ae1f5d34c49d77b/library/std/src/sys_common/backtrace.rs:61
[INFO] [stderr]    7:     0x7f6234d8acb0 - std::sys_common::backtrace::print::h213be73e5670b8ea
[INFO] [stderr]                                at /rustc/5e3f1b148db5bfa27fee52464ae1f5d34c49d77b/library/std/src/sys_common/backtrace.rs:48
[INFO] [stderr]    8:     0x7f6234d8acb0 - std::panicking::default_hook::{{closure}}::h2d49a3361cc4e7ea
[INFO] [stderr]                                at /rustc/5e3f1b148db5bfa27fee52464ae1f5d34c49d77b/library/std/src/panicking.rs:200
[INFO] [stderr]    9:     0x7f6234d8a9fc - std::panicking::default_hook::hd41fbdeba93207ba
[INFO] [stderr]                                at /rustc/5e3f1b148db5bfa27fee52464ae1f5d34c49d77b/library/std/src/panicking.rs:219
[INFO] [stderr]   10:     0x7f62355c62a9 - rustc_driver::report_ice::h1120fbf2656cc9f3
[INFO] [stderr]   11:     0x7f6234d8b448 - std::panicking::rust_panic_with_hook::hcab398664b4bd473
[INFO] [stderr]                                at /rustc/5e3f1b148db5bfa27fee52464ae1f5d34c49d77b/library/std/src/panicking.rs:573
[INFO] [stderr]   12:     0x7f6234d8aff9 - std::panicking::begin_panic_handler::{{closure}}::h7512c6f2998ba93d
[INFO] [stderr]                                at /rustc/5e3f1b148db5bfa27fee52464ae1f5d34c49d77b/library/std/src/panicking.rs:476
[INFO] [stderr]   13:     0x7f6234d8666c - std::sys_common::backtrace::__rust_end_short_backtrace::h1a25d7e7e1864d3d
[INFO] [stderr]                                at /rustc/5e3f1b148db5bfa27fee52464ae1f5d34c49d77b/library/std/src/sys_common/backtrace.rs:153
[INFO] [stderr]   14:     0x7f6234d8afb9 - rust_begin_unwind
[INFO] [stderr]                                at /rustc/5e3f1b148db5bfa27fee52464ae1f5d34c49d77b/library/std/src/panicking.rs:475
[INFO] [stderr]   15:     0x7f6234df2d01 - core::panicking::panic_fmt::h019ad16a92ccd092
[INFO] [stderr]                                at /rustc/5e3f1b148db5bfa27fee52464ae1f5d34c49d77b/library/core/src/panicking.rs:85
[INFO] [stderr]   16:     0x7f6234df2c4d - core::panicking::panic::hf72d67b706869386
[INFO] [stderr]                                at /rustc/5e3f1b148db5bfa27fee52464ae1f5d34c49d77b/library/core/src/panicking.rs:50
[INFO] [stderr]   17:     0x7f6236a0451c - <rustc_mir::transform::match_branches::MatchBranchSimplification as rustc_mir::transform::MirPass>::run_pass::hcfac8558bd52d9ad
[INFO] [stderr]   18:     0x7f6236dfc825 - rustc_mir::transform::run_passes::h5d2d711a3423ab80
[INFO] [stderr]   19:     0x7f6236dfe97d - rustc_mir::transform::run_optimization_passes::h9c3b574885293427
[INFO] [stderr]   20:     0x7f6236dfed50 - rustc_mir::transform::inner_optimized_mir::hfad84173074cc037
[INFO] [stderr]   21:     0x7f6236dfeb0d - rustc_mir::transform::optimized_mir::h9e54a66d9e6f2339
[INFO] [stderr]   22:     0x7f6237f24120 - rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl::h6cecaa49ba76c0a3
[INFO] [stderr]   23:     0x7f6238182872 - rustc_data_structures::stack::ensure_sufficient_stack::hfe875ede115d67ca
[INFO] [stderr]   24:     0x7f6237e0f188 - rustc_query_system::query::plumbing::get_query_impl::he20f0bfe9c12825f
[INFO] [stderr]   25:     0x7f62381f9b81 - rustc_middle::ty::<impl rustc_middle::ty::context::TyCtxt>::instance_mir::h346400239c191f09
[INFO] [stderr]   26:     0x7f6236b7eb18 - rustc_mir::monomorphize::collector::collect_neighbours::h8ce8c636fe5b1784
[INFO] [stderr]   27:     0x7f6236b7a1bb - rustc_mir::monomorphize::collector::collect_items_rec::h418d757a46fb996f
[INFO] [stderr]   28:     0x7f6236b79a13 - rustc_mir::monomorphize::collector::collect_items_rec::h418d757a46fb996f
[INFO] [stderr]   29:     0x7f6236b79a13 - rustc_mir::monomorphize::collector::collect_items_rec::h418d757a46fb996f
[INFO] [stderr]   30:     0x7f6236b79a13 - rustc_mir::monomorphize::collector::collect_items_rec::h418d757a46fb996f
[INFO] [stderr]   31:     0x7f6236b79a13 - rustc_mir::monomorphize::collector::collect_items_rec::h418d757a46fb996f
[INFO] [stderr]   32:     0x7f6236b79a13 - rustc_mir::monomorphize::collector::collect_items_rec::h418d757a46fb996f
[INFO] [stderr]   33:     0x7f6236b79a13 - rustc_mir::monomorphize::collector::collect_items_rec::h418d757a46fb996f
[INFO] [stderr]   34:     0x7f6236b79a13 - rustc_mir::monomorphize::collector::collect_items_rec::h418d757a46fb996f
[INFO] [stderr]   35:     0x7f6236b79a13 - rustc_mir::monomorphize::collector::collect_items_rec::h418d757a46fb996f
[INFO] [stderr]   36:     0x7f6236b79a13 - rustc_mir::monomorphize::collector::collect_items_rec::h418d757a46fb996f
[INFO] [stderr]   37:     0x7f6236b79a13 - rustc_mir::monomorphize::collector::collect_items_rec::h418d757a46fb996f
[INFO] [stderr]   38:     0x7f6236b79a13 - rustc_mir::monomorphize::collector::collect_items_rec::h418d757a46fb996f
[INFO] [stderr]   39:     0x7f6236b79a13 - rustc_mir::monomorphize::collector::collect_items_rec::h418d757a46fb996f
[INFO] [stderr]   40:     0x7f6236d29304 - rustc_session::utils::<impl rustc_session::session::Session>::time::hd6a08884a011ba31
[INFO] [stderr]   41:     0x7f6236b78b91 - rustc_mir::monomorphize::collector::collect_crate_mono_items::h75156df70a58ab8b
[INFO] [stderr]   42:     0x7f6236e91844 - rustc_mir::monomorphize::partitioning::collect_and_partition_mono_items::h4fb78fb6b31230fe
[INFO] [stderr]   43:     0x7f6235bf39d2 - rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::collect_and_partition_mono_items>::compute::h773f634efe0f6eb1
[INFO] [stderr]   44:     0x7f6235b53d09 - rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl::h059c5cbcd29e810b
[INFO] [stderr]   45:     0x7f6235bc2c2c - rustc_data_structures::stack::ensure_sufficient_stack::hcece758719110f6c
[INFO] [stderr]   46:     0x7f6235ac0d53 - rustc_query_system::query::plumbing::get_query_impl::h0a8e0df37d2bb58a
[INFO] [stderr]   47:     0x7f6235c00419 - rustc_codegen_ssa::base::codegen_crate::hdf396a21f4c9d336
[INFO] [stderr]   48:     0x7f6235bee1b5 - <rustc_codegen_llvm::LlvmCodegenBackend as rustc_codegen_ssa::traits::backend::CodegenBackend>::codegen_crate::h6358a6d1778d55a3
[INFO] [stderr]   49:     0x7f6235947150 - rustc_session::utils::<impl rustc_session::session::Session>::time::hfca446ba2d5e39d2
[INFO] [stderr]   50:     0x7f6235996ec3 - rustc_interface::passes::QueryContext::enter::h28318a481c9f153f
[INFO] [stderr]   51:     0x7f62359c4fa3 - rustc_interface::queries::Queries::ongoing_codegen::h04630f86a5de5c66
[INFO] [stderr]   52:     0x7f6235609ac2 - rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter::hdf18b982b0040d8c
[INFO] [stderr]   53:     0x7f62355cb37d - rustc_span::with_source_map::h4312ff0660509f98
[INFO] [stderr]   54:     0x7f623560a7f5 - rustc_interface::interface::create_compiler_and_run::hb2f7781764c10c57
[INFO] [stderr]   55:     0x7f62355cc4bb - rustc_span::with_session_globals::h6f0396829c123936
[INFO] [stderr]   56:     0x7f62355fa3fd - std::sys_common::backtrace::__rust_begin_short_backtrace::habb527642304c3bb
[INFO] [stderr]   57:     0x7f62355b071e - core::ops::function::FnOnce::call_once{{vtable.shim}}::hbe0f8ecc165e4f02
[INFO] [stderr]   58:     0x7f6234d9c27a - <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::h8a8db08de617a605
[INFO] [stderr]                                at /rustc/5e3f1b148db5bfa27fee52464ae1f5d34c49d77b/library/alloc/src/boxed.rs:1025
[INFO] [stderr]   59:     0x7f6234d9c27a - <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::hddfcff0ffd25c0c4
[INFO] [stderr]                                at /rustc/5e3f1b148db5bfa27fee52464ae1f5d34c49d77b/library/alloc/src/boxed.rs:1025
[INFO] [stderr]   60:     0x7f6234d9c27a - std::sys::unix::thread::Thread::new::thread_start::h8e648f9ee2e9cb3a
[INFO] [stderr]                                at /rustc/5e3f1b148db5bfa27fee52464ae1f5d34c49d77b/library/std/src/sys/unix/thread.rs:87
[INFO] [stderr]   61:     0x7f6234cb9609 - start_thread
[INFO] [stderr]   62:     0x7f6234bcd103 - clone
[INFO] [stderr]   63:                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 1.47.0-nightly (5e3f1b148 2020-08-13) running on x86_64-unknown-linux-gnu
[INFO] [stderr] 
[INFO] [stderr] note: compiler flags: -C prefer-dynamic -C embed-bitcode=no -C debuginfo=2 --crate-type proc-macro
[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 [optimized_mir] optimizing MIR for `arch::x64::compiler::compile_instruction`
[INFO] [stderr] #1 [collect_and_partition_mono_items] collect_and_partition_mono_items
[INFO] [stderr] end of query stack
[INFO] [stderr] error: could not compile `dynasm`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "26b2d4e90379af2ba4be80bb7c85f019c507b218d7b6e5f5523273405323281a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "26b2d4e90379af2ba4be80bb7c85f019c507b218d7b6e5f5523273405323281a", kill_on_drop: false }`
[INFO] [stdout] 26b2d4e90379af2ba4be80bb7c85f019c507b218d7b6e5f5523273405323281a