[INFO] cloning repository https://github.com/abuit/rust-markov
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/abuit/rust-markov" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fabuit%2Frust-markov", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fabuit%2Frust-markov'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 95ec4e97ce1f93dc5a402b4659a30b83966e182f
[INFO] building abuit/rust-markov against try#14accda7ba2c586835d15379a621955d9f047371 for pr-103610
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fabuit%2Frust-markov" "/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/abuit/rust-markov on toolchain 14accda7ba2c586835d15379a621955d9f047371
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+14accda7ba2c586835d15379a621955d9f047371" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/abuit/rust-markov
[INFO] finished tweaking git repo https://github.com/abuit/rust-markov
[INFO] tweaked toml for git repo https://github.com/abuit/rust-markov written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/abuit/rust-markov already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+14accda7ba2c586835d15379a621955d9f047371" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:83125433e4fff17b1ac56874832f668d9df75ee638575aca552b68e127bedee9" "/opt/rustwide/cargo-home/bin/cargo" "+14accda7ba2c586835d15379a621955d9f047371" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 572d6e6b6eb4651748fdd34bf7ebec923f55a4c4713fb7b6c1b1f288857878ad
[INFO] running `Command { std: "docker" "start" "-a" "572d6e6b6eb4651748fdd34bf7ebec923f55a4c4713fb7b6c1b1f288857878ad", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "572d6e6b6eb4651748fdd34bf7ebec923f55a4c4713fb7b6c1b1f288857878ad", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "572d6e6b6eb4651748fdd34bf7ebec923f55a4c4713fb7b6c1b1f288857878ad", kill_on_drop: false }`
[INFO] [stdout] 572d6e6b6eb4651748fdd34bf7ebec923f55a4c4713fb7b6c1b1f288857878ad
[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" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:83125433e4fff17b1ac56874832f668d9df75ee638575aca552b68e127bedee9" "/opt/rustwide/cargo-home/bin/cargo" "+14accda7ba2c586835d15379a621955d9f047371" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c79831ac6de990fdea48574fea63db547775eebb882e91650a21e0e26df7ee15
[INFO] running `Command { std: "docker" "start" "-a" "c79831ac6de990fdea48574fea63db547775eebb882e91650a21e0e26df7ee15", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v0.1.4
[INFO] [stderr]    Compiling rand_core v0.4.0
[INFO] [stderr]    Compiling libc v0.2.55
[INFO] [stderr]    Compiling rand_core v0.3.1
[INFO] [stderr]    Compiling rand_jitter v0.1.4
[INFO] [stderr]    Compiling rand_xorshift v0.1.1
[INFO] [stderr]    Compiling rand_hc v0.1.0
[INFO] [stderr]    Compiling rand_isaac v0.1.1
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr] error: failed to run custom build command for `libc v0.2.55`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/target/debug/build/libc-0d16dfa5e4e4f516/build-script-build` (exit status: 101)
[INFO] [stderr]   --- stderr
[INFO] [stderr]   thread 'main' panicked at 'Failed to get rustc version', /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/libc-0.2.55/build.rs:7:31
[INFO] [stderr]   stack backtrace:
[INFO] [stderr]      0:     0x55b447547c60 - std::backtrace_rs::backtrace::libunwind::trace::h7633eb641459aaeb
[INFO] [stderr]                                  at /rustc/14accda7ba2c586835d15379a621955d9f047371/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
[INFO] [stderr]      1:     0x55b447547c60 - std::backtrace_rs::backtrace::trace_unsynchronized::he26627fdd4907ad8
[INFO] [stderr]                                  at /rustc/14accda7ba2c586835d15379a621955d9f047371/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
[INFO] [stderr]      2:     0x55b447547c60 - std::sys_common::backtrace::_print_fmt::h7469132437f98c76
[INFO] [stderr]                                  at /rustc/14accda7ba2c586835d15379a621955d9f047371/library/std/src/sys_common/backtrace.rs:65:5
[INFO] [stderr]      3:     0x55b447547c60 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h251859263554ada4
[INFO] [stderr]                                  at /rustc/14accda7ba2c586835d15379a621955d9f047371/library/std/src/sys_common/backtrace.rs:44:22
[INFO] [stderr]      4:     0x55b447564c4e - core::fmt::write::hc10398849ebfa2c4
[INFO] [stderr]                                  at /rustc/14accda7ba2c586835d15379a621955d9f047371/library/core/src/fmt/mod.rs:1209:17
[INFO] [stderr]      5:     0x55b447545225 - std::io::Write::write_fmt::h379fea3228f07ce0
[INFO] [stderr]                                  at /rustc/14accda7ba2c586835d15379a621955d9f047371/library/std/src/io/mod.rs:1682:15
[INFO] [stderr]      6:     0x55b447547a25 - std::sys_common::backtrace::_print::hddc08f10d993470f
[INFO] [stderr]                                  at /rustc/14accda7ba2c586835d15379a621955d9f047371/library/std/src/sys_common/backtrace.rs:47:5
[INFO] [stderr]      7:     0x55b447547a25 - std::sys_common::backtrace::print::h9971de2c9fdfbc98
[INFO] [stderr]                                  at /rustc/14accda7ba2c586835d15379a621955d9f047371/library/std/src/sys_common/backtrace.rs:34:9
[INFO] [stderr]      8:     0x55b44754912f - std::panicking::default_hook::{{closure}}::h2b011782b6ba69da
[INFO] [stderr]                                  at /rustc/14accda7ba2c586835d15379a621955d9f047371/library/std/src/panicking.rs:267:22
[INFO] [stderr]      9:     0x55b447548e6a - std::panicking::default_hook::hcb801ed1969610aa
[INFO] [stderr]                                  at /rustc/14accda7ba2c586835d15379a621955d9f047371/library/std/src/panicking.rs:286:9
[INFO] [stderr]     10:     0x55b447549828 - std::panicking::rust_panic_with_hook::hd24ee2ee98b62fd0
[INFO] [stderr]                                  at /rustc/14accda7ba2c586835d15379a621955d9f047371/library/std/src/panicking.rs:688:13
[INFO] [stderr]     11:     0x55b4475495c7 - std::panicking::begin_panic_handler::{{closure}}::h4128f55dcad95665
[INFO] [stderr]                                  at /rustc/14accda7ba2c586835d15379a621955d9f047371/library/std/src/panicking.rs:579:13
[INFO] [stderr]     12:     0x55b44754810c - std::sys_common::backtrace::__rust_end_short_backtrace::hddedce0aa92e3938
[INFO] [stderr]                                  at /rustc/14accda7ba2c586835d15379a621955d9f047371/library/std/src/sys_common/backtrace.rs:137:18
[INFO] [stderr]     13:     0x55b4475492e2 - rust_begin_unwind
[INFO] [stderr]                                  at /rustc/14accda7ba2c586835d15379a621955d9f047371/library/std/src/panicking.rs:575:5
[INFO] [stderr]     14:     0x55b447524083 - core::panicking::panic_fmt::h3331ce9446971266
[INFO] [stderr]                                  at /rustc/14accda7ba2c586835d15379a621955d9f047371/library/core/src/panicking.rs:65:14
[INFO] [stderr]     15:     0x55b447563ef1 - core::panicking::panic_display::h8da214595d9c651c
[INFO] [stderr]                                  at /rustc/14accda7ba2c586835d15379a621955d9f047371/library/core/src/panicking.rs:139:5
[INFO] [stderr]     16:     0x55b447563e9b - core::panicking::panic_str::hdf71a800693243e9
[INFO] [stderr]                                  at /rustc/14accda7ba2c586835d15379a621955d9f047371/library/core/src/panicking.rs:123:5
[INFO] [stderr]     17:     0x55b447524046 - core::option::expect_failed::h5e66c23b1347b659
[INFO] [stderr]                                  at /rustc/14accda7ba2c586835d15379a621955d9f047371/library/core/src/option.rs:1879:5
[INFO] [stderr]     18:     0x55b4475286ea - core::option::Option<T>::expect::h93a2bc5ed36c3785
[INFO] [stderr]                                  at /rustc/14accda7ba2c586835d15379a621955d9f047371/library/core/src/option.rs:741:21
[INFO] [stderr]     19:     0x55b44752a394 - build_script_build::main::hc2cc8a4a18690e1a
[INFO] [stderr]                                  at /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/libc-0.2.55/build.rs:7:9
[INFO] [stderr]     20:     0x55b4475279bb - core::ops::function::FnOnce::call_once::hea6e5320fd3736df
[INFO] [stderr]                                  at /rustc/14accda7ba2c586835d15379a621955d9f047371/library/core/src/ops/function.rs:251:5
[INFO] [stderr]     21:     0x55b447529f7e - std::sys_common::backtrace::__rust_begin_short_backtrace::h52057cf555b1e840
[INFO] [stderr]                                  at /rustc/14accda7ba2c586835d15379a621955d9f047371/library/std/src/sys_common/backtrace.rs:121:18
[INFO] [stderr]     22:     0x55b447529ff1 - std::rt::lang_start::{{closure}}::he93626343cd51a22
[INFO] [stderr]                                  at /rustc/14accda7ba2c586835d15379a621955d9f047371/library/std/src/rt.rs:166:18
[INFO] [stderr]     23:     0x55b44754268b - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::h96047c53f25c9ab9
[INFO] [stderr]                                  at /rustc/14accda7ba2c586835d15379a621955d9f047371/library/core/src/ops/function.rs:286:13
[INFO] [stderr]     24:     0x55b44754268b - std::panicking::try::do_call::hd93cc5ad7d7f3960
[INFO] [stderr]                                  at /rustc/14accda7ba2c586835d15379a621955d9f047371/library/std/src/panicking.rs:483:40
[INFO] [stderr]     25:     0x55b44754268b - std::panicking::try::h3f8a0aec10bf973e
[INFO] [stderr]                                  at /rustc/14accda7ba2c586835d15379a621955d9f047371/library/std/src/panicking.rs:447:19
[INFO] [stderr]     26:     0x55b44754268b - std::panic::catch_unwind::hf6db73add5b88e9f
[INFO] [stderr]                                  at /rustc/14accda7ba2c586835d15379a621955d9f047371/library/std/src/panic.rs:137:14
[INFO] [stderr]     27:     0x55b44754268b - std::rt::lang_start_internal::{{closure}}::h298464fec6b50def
[INFO] [stderr]                                  at /rustc/14accda7ba2c586835d15379a621955d9f047371/library/std/src/rt.rs:148:48
[INFO] [stderr]     28:     0x55b44754268b - std::panicking::try::do_call::h23d2246eb2e6e555
[INFO] [stderr]                                  at /rustc/14accda7ba2c586835d15379a621955d9f047371/library/std/src/panicking.rs:483:40
[INFO] [stderr]     29:     0x55b44754268b - std::panicking::try::h06faa2d99f64be23
[INFO] [stderr]                                  at /rustc/14accda7ba2c586835d15379a621955d9f047371/library/std/src/panicking.rs:447:19
[INFO] [stderr]     30:     0x55b44754268b - std::panic::catch_unwind::hc70f54f4b97a18c9
[INFO] [stderr]                                  at /rustc/14accda7ba2c586835d15379a621955d9f047371/library/std/src/panic.rs:137:14
[INFO] [stderr]     31:     0x55b44754268b - std::rt::lang_start_internal::hc6c949349c843066
[INFO] [stderr]                                  at /rustc/14accda7ba2c586835d15379a621955d9f047371/library/std/src/rt.rs:148:20
[INFO] [stderr]     32:     0x55b447529fca - std::rt::lang_start::h3a1f786432bf6dcc
[INFO] [stderr]                                  at /rustc/14accda7ba2c586835d15379a621955d9f047371/library/std/src/rt.rs:165:17
[INFO] [stderr]     33:     0x55b44752abde - main
[INFO] [stderr]     34:     0x7f1c6bcaa083 - __libc_start_main
[INFO] [stderr]     35:     0x55b4475243ce - _start
[INFO] [stderr]     36:                0x0 - <unknown>
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "c79831ac6de990fdea48574fea63db547775eebb882e91650a21e0e26df7ee15", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c79831ac6de990fdea48574fea63db547775eebb882e91650a21e0e26df7ee15", kill_on_drop: false }`
[INFO] [stdout] c79831ac6de990fdea48574fea63db547775eebb882e91650a21e0e26df7ee15