[INFO] cloning repository https://github.com/robertbrignull/rhythmical
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/robertbrignull/rhythmical" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frobertbrignull%2Frhythmical", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frobertbrignull%2Frhythmical'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 87b95154a7ec4732ebef6103d50157f14f985934
[INFO] checking robertbrignull/rhythmical against master#e22b61bff0bdd08be7665607cb7be3748c8a35d2 for pr-74627
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frobertbrignull%2Frhythmical" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/robertbrignull/rhythmical on toolchain e22b61bff0bdd08be7665607cb7be3748c8a35d2
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+e22b61bff0bdd08be7665607cb7be3748c8a35d2" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/robertbrignull/rhythmical
[INFO] finished tweaking git repo https://github.com/robertbrignull/rhythmical
[INFO] tweaked toml for git repo https://github.com/robertbrignull/rhythmical written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/robertbrignull/rhythmical already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+e22b61bff0bdd08be7665607cb7be3748c8a35d2" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+e22b61bff0bdd08be7665607cb7be3748c8a35d2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6d0a8e8bb2901896a02629e69089c550bed1dbd4834133dbbee4216f55860b40
[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" "6d0a8e8bb2901896a02629e69089c550bed1dbd4834133dbbee4216f55860b40", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6d0a8e8bb2901896a02629e69089c550bed1dbd4834133dbbee4216f55860b40", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6d0a8e8bb2901896a02629e69089c550bed1dbd4834133dbbee4216f55860b40", kill_on_drop: false }`
[INFO] [stdout] 6d0a8e8bb2901896a02629e69089c550bed1dbd4834133dbbee4216f55860b40
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+e22b61bff0bdd08be7665607cb7be3748c8a35d2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] db6744ebd3194b6d7374c4e027c8ded58ce6d09190e1ae40cad290686716c43c
[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" "db6744ebd3194b6d7374c4e027c8ded58ce6d09190e1ae40cad290686716c43c", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.48
[INFO] [stderr]    Compiling rand_core v0.4.0
[INFO] [stderr]    Compiling version_check v0.1.5
[INFO] [stderr]     Checking cfg-if v0.1.6
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]    Compiling autocfg v0.1.2
[INFO] [stderr]    Compiling siphasher v0.2.3
[INFO] [stderr]    Compiling memchr v2.1.3
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]    Compiling num-traits v0.2.6
[INFO] [stderr]    Compiling build_const v0.2.1
[INFO] [stderr]    Compiling proc-macro2 v0.4.27
[INFO] [stderr]    Compiling byteorder v1.3.1
[INFO] [stderr]     Checking matches v0.1.8
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling cc v1.0.29
[INFO] [stderr]    Compiling num-integer v0.1.39
[INFO] [stderr]    Compiling serde v1.0.87
[INFO] [stderr]    Compiling httparse v1.3.3
[INFO] [stderr]    Compiling ryu v0.2.7
[INFO] [stderr]     Checking remove_dir_all v0.5.1
[INFO] [stderr]     Checking safemem v0.3.0
[INFO] [stderr]     Checking ascii v0.8.7
[INFO] [stderr]     Checking lazy_static v1.2.0
[INFO] [stderr]     Checking chunked_transfer v0.3.1
[INFO] [stderr]    Compiling regex v1.1.0
[INFO] [stderr]     Checking itoa v0.4.3
[INFO] [stderr]     Checking ucd-util v0.1.3
[INFO] [stderr]     Checking adler32 v1.0.3
[INFO] [stderr]     Checking quick-error v1.2.2
[INFO] [stderr]     Checking sha1 v0.6.0
[INFO] [stderr]    Compiling rhythmical v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking utf8-ranges v1.0.2
[INFO] [stderr]     Checking htmlescape v0.3.1
[INFO] [stderr]     Checking log v0.4.6
[INFO] [stderr]     Checking unicode-bidi v0.3.4
[INFO] [stderr]     Checking unreachable v1.0.0
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling rand_core v0.3.1
[INFO] [stderr]    Compiling rand_jitter v0.1.2
[INFO] [stderr]    Compiling crc v1.8.1
[INFO] [stderr]    Compiling unicase v1.4.2
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]     Checking regex-syntax v0.6.5
[INFO] [stderr]    Compiling rand_isaac v0.1.1
[INFO] [stderr]    Compiling rand_hc v0.1.0
[INFO] [stderr]    Compiling rand_xorshift v0.1.1
[INFO] [stderr]     Checking smallvec v0.6.8
[INFO] [stderr]     Checking log v0.3.9
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr] error: failed to run custom build command for `rhythmical v0.1.0 (/opt/rustwide/workdir)`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/target/debug/build/rhythmical-7ad0f3a32855f02c/build-script-build` (exit code: 101)
[INFO] [stderr]   --- stderr
[INFO] [stderr]   thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Os { code: 2, kind: NotFound, message: "No such file or directory" }', build.rs:15:14
[INFO] [stderr]   stack backtrace:
[INFO] [stderr]      0:     0x55ca44db262f - std::backtrace_rs::backtrace::libunwind::trace::h8864605b5c3dbe2c
[INFO] [stderr]                                  at /rustc/e22b61bff0bdd08be7665607cb7be3748c8a35d2/src/libstd/../backtrace/src/backtrace/libunwind.rs:96
[INFO] [stderr]      1:     0x55ca44db262f - std::backtrace_rs::backtrace::trace_unsynchronized::h1f622efed412f077
[INFO] [stderr]                                  at /rustc/e22b61bff0bdd08be7665607cb7be3748c8a35d2/src/libstd/../backtrace/src/backtrace/mod.rs:66
[INFO] [stderr]      2:     0x55ca44db262f - std::sys_common::backtrace::_print_fmt::h8e17da323f21cc2b
[INFO] [stderr]                                  at /rustc/e22b61bff0bdd08be7665607cb7be3748c8a35d2/src/libstd/sys_common/backtrace.rs:77
[INFO] [stderr]      3:     0x55ca44db262f - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hd4a7293426badf40
[INFO] [stderr]                                  at /rustc/e22b61bff0bdd08be7665607cb7be3748c8a35d2/src/libstd/sys_common/backtrace.rs:58
[INFO] [stderr]      4:     0x55ca44dd081c - core::fmt::write::hfbd2baad61ed21a8
[INFO] [stderr]                                  at /rustc/e22b61bff0bdd08be7665607cb7be3748c8a35d2/src/libcore/fmt/mod.rs:1117
[INFO] [stderr]      5:     0x55ca44db0b52 - std::io::Write::write_fmt::h54828fb1bd41a052
[INFO] [stderr]                                  at /rustc/e22b61bff0bdd08be7665607cb7be3748c8a35d2/src/libstd/io/mod.rs:1508
[INFO] [stderr]      6:     0x55ca44db4b30 - std::sys_common::backtrace::_print::h6ba0300926b9fb58
[INFO] [stderr]                                  at /rustc/e22b61bff0bdd08be7665607cb7be3748c8a35d2/src/libstd/sys_common/backtrace.rs:61
[INFO] [stderr]      7:     0x55ca44db4b30 - std::sys_common::backtrace::print::hd11f0188385cb859
[INFO] [stderr]                                  at /rustc/e22b61bff0bdd08be7665607cb7be3748c8a35d2/src/libstd/sys_common/backtrace.rs:48
[INFO] [stderr]      8:     0x55ca44db4b30 - std::panicking::default_hook::{{closure}}::h57b45fcdc30fe8e4
[INFO] [stderr]                                  at /rustc/e22b61bff0bdd08be7665607cb7be3748c8a35d2/src/libstd/panicking.rs:198
[INFO] [stderr]      9:     0x55ca44db487c - std::panicking::default_hook::h067cd795bad37ff3
[INFO] [stderr]                                  at /rustc/e22b61bff0bdd08be7665607cb7be3748c8a35d2/src/libstd/panicking.rs:217
[INFO] [stderr]     10:     0x55ca44db5173 - std::panicking::rust_panic_with_hook::hd1b93581b69959be
[INFO] [stderr]                                  at /rustc/e22b61bff0bdd08be7665607cb7be3748c8a35d2/src/libstd/panicking.rs:526
[INFO] [stderr]     11:     0x55ca44db4d6b - rust_begin_unwind
[INFO] [stderr]                                  at /rustc/e22b61bff0bdd08be7665607cb7be3748c8a35d2/src/libstd/panicking.rs:437
[INFO] [stderr]     12:     0x55ca44dcfc21 - core::panicking::panic_fmt::h9cc57011b345cfad
[INFO] [stderr]                                  at /rustc/e22b61bff0bdd08be7665607cb7be3748c8a35d2/src/libcore/panicking.rs:85
[INFO] [stderr]     13:     0x55ca44dcfa43 - core::option::expect_none_failed::h10abb5a6aef32df8
[INFO] [stderr]                                  at /rustc/e22b61bff0bdd08be7665607cb7be3748c8a35d2/src/libcore/option.rs:1273
[INFO] [stderr]     14:     0x55ca44d9882b - core::result::Result<T,E>::unwrap::h2eced39ac3e2b0c3
[INFO] [stderr]                                  at /rustc/e22b61bff0bdd08be7665607cb7be3748c8a35d2/src/libcore/result.rs:1005
[INFO] [stderr]     15:     0x55ca44d9cd0d - build_script_build::main::h6571844b4d46b9bd
[INFO] [stderr]                                  at /opt/rustwide/workdir/build.rs:12
[INFO] [stderr]     16:     0x55ca44d9a63b - std::rt::lang_start::{{closure}}::hfed5e4131fd91c8a
[INFO] [stderr]                                  at /rustc/e22b61bff0bdd08be7665607cb7be3748c8a35d2/src/libstd/rt.rs:67
[INFO] [stderr]     17:     0x55ca44db5543 - std::rt::lang_start_internal::{{closure}}::h9a7ec4d0a4846786
[INFO] [stderr]                                  at /rustc/e22b61bff0bdd08be7665607cb7be3748c8a35d2/src/libstd/rt.rs:52
[INFO] [stderr]     18:     0x55ca44db5543 - std::panicking::try::do_call::h31d9073533c95062
[INFO] [stderr]                                  at /rustc/e22b61bff0bdd08be7665607cb7be3748c8a35d2/src/libstd/panicking.rs:348
[INFO] [stderr]     19:     0x55ca44db5543 - std::panicking::try::h9be90170880ba1d0
[INFO] [stderr]                                  at /rustc/e22b61bff0bdd08be7665607cb7be3748c8a35d2/src/libstd/panicking.rs:325
[INFO] [stderr]     20:     0x55ca44db5543 - std::panic::catch_unwind::hba3ee29aa4d47586
[INFO] [stderr]                                  at /rustc/e22b61bff0bdd08be7665607cb7be3748c8a35d2/src/libstd/panic.rs:394
[INFO] [stderr]     21:     0x55ca44db5543 - std::rt::lang_start_internal::h90880417661a7eb6
[INFO] [stderr]                                  at /rustc/e22b61bff0bdd08be7665607cb7be3748c8a35d2/src/libstd/rt.rs:51
[INFO] [stderr]     22:     0x55ca44d9a617 - std::rt::lang_start::h96afade37ce01a96
[INFO] [stderr]                                  at /rustc/e22b61bff0bdd08be7665607cb7be3748c8a35d2/src/libstd/rt.rs:67
[INFO] [stderr]     23:     0x55ca44d9d12a - main
[INFO] [stderr]     24:     0x7f42240390b3 - __libc_start_main
[INFO] [stderr]     25:     0x55ca44d9609e - _start
[INFO] [stderr]     26:                0x0 - <unknown>
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "db6744ebd3194b6d7374c4e027c8ded58ce6d09190e1ae40cad290686716c43c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "db6744ebd3194b6d7374c4e027c8ded58ce6d09190e1ae40cad290686716c43c", kill_on_drop: false }`
[INFO] [stdout] db6744ebd3194b6d7374c4e027c8ded58ce6d09190e1ae40cad290686716c43c