[INFO] cloning repository https://github.com/Indosaram/rust-python-book
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Indosaram/rust-python-book" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FIndosaram%2Frust-python-book", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FIndosaram%2Frust-python-book'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9373278daed40f1776ac428d2f8b38ba67d0ecd8
[INFO] checking Indosaram/rust-python-book against master#e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682 for beta-170-4
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FIndosaram%2Frust-python-book" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Indosaram/rust-python-book on toolchain e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Indosaram/rust-python-book
[INFO] finished tweaking git repo https://github.com/Indosaram/rust-python-book
[INFO] tweaked toml for git repo https://github.com/Indosaram/rust-python-book written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/Indosaram/rust-python-book already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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@sha256:19e73879b68f455e41552ea35293514db52ea292d993f571636dbffedb77a1ee" "/opt/rustwide/cargo-home/bin/cargo" "+e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5ed3294140be68d6961b141856fecb58e429149673a0383b03992454ebabbcd0
[INFO] running `Command { std: "docker" "start" "-a" "5ed3294140be68d6961b141856fecb58e429149673a0383b03992454ebabbcd0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5ed3294140be68d6961b141856fecb58e429149673a0383b03992454ebabbcd0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5ed3294140be68d6961b141856fecb58e429149673a0383b03992454ebabbcd0", kill_on_drop: false }`
[INFO] [stdout] 5ed3294140be68d6961b141856fecb58e429149673a0383b03992454ebabbcd0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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@sha256:19e73879b68f455e41552ea35293514db52ea292d993f571636dbffedb77a1ee" "/opt/rustwide/cargo-home/bin/cargo" "+e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1dcac06ff1f83ee0b7e5d90e64a8dabc2df39afb4e75e488cb3dccdb6f0ba34d
[INFO] running `Command { std: "docker" "start" "-a" "1dcac06ff1f83ee0b7e5d90e64a8dabc2df39afb4e75e488cb3dccdb6f0ba34d", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.43
[INFO] [stderr]    Compiling unicode-ident v1.0.3
[INFO] [stderr]    Compiling quote v1.0.21
[INFO] [stderr]    Compiling syn v1.0.99
[INFO] [stderr]    Compiling serde_derive v1.0.144
[INFO] [stderr]    Compiling serde v1.0.144
[INFO] [stderr]    Compiling serde_json v1.0.85
[INFO] [stderr]    Compiling semver v1.0.13
[INFO] [stderr]    Compiling libc v0.2.132
[INFO] [stderr]    Compiling camino v1.1.1
[INFO] [stderr]    Compiling pulldown-cmark v0.9.2
[INFO] [stderr]    Compiling itoa v1.0.3
[INFO] [stderr]    Compiling ryu v1.0.11
[INFO] [stderr]    Compiling bitflags v1.3.2
[INFO] [stderr]    Compiling unicase v2.6.0
[INFO] [stderr]    Compiling error-chain v0.12.4
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling fastrand v1.8.0
[INFO] [stderr]    Compiling same-file v1.0.6
[INFO] [stderr]    Compiling remove_dir_all v0.5.3
[INFO] [stderr]    Compiling walkdir v2.3.2
[INFO] [stderr]    Compiling bytecount v0.6.3
[INFO] [stderr]    Compiling tempfile v3.3.0
[INFO] [stderr]     Checking cargo-platform v0.1.2
[INFO] [stderr]     Checking cargo_metadata v0.14.2
[INFO] [stderr]     Checking skeptic v0.13.7
[INFO] [stderr]    Compiling marktest v0.1.0 (/opt/rustwide/workdir/marktest)
[INFO] [stderr] error: failed to run custom build command for `marktest v0.1.0 (/opt/rustwide/workdir/marktest)`
[INFO] [stderr] note: To improve backtraces for build dependencies, set the CARGO_PROFILE_DEV_BUILD_OVERRIDE_DEBUG=true environment variable to enable debug information generation.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/target/debug/build/marktest-c46d0bff953092a2/build-script-build` (exit status: 101)
[INFO] [stderr]   --- stdout
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch10-00.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch7-00.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch9-02.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch10-02.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch2-02.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch8-01.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch13-00.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch15-01.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch3-00.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch6-00.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch2-01.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch10-03.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch13-01.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch2-03.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch15-03.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch4-02.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch9-00.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch13-02.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch4-04.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch5-01.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch7-02.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch15-02.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/SUMMARY.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch14-01.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch7-01.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch2-04.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch3-01.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch1-01.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch4-03.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/assets
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch3-03.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch9-04.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch4-00.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch12-02.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch11-03.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch1-03.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch6-03.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch6-02.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch1-00.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch13-03.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch2-05.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch14-03.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch10-01.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch12-03.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch4-01.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch12-00.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch4-05.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch6-01.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch1-04.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch12-01.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch9-03.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch11-02.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch9-01.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch14-00.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch5-02.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch10-04.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch11-01.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch2-00.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch15-00.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/project.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch5-03.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch11-00.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch14-02.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch8-02.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch3-02.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch1-02.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch5-00.md
[INFO] [stderr]   cargo:rerun-if-changed=../src/ch8-00.md
[INFO] [stderr] 
[INFO] [stderr]   --- stderr
[INFO] [stderr]   thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Os { code: 21, kind: IsADirectory, message: "Is a directory" }', /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/skeptic-0.13.7/src/lib.rs:133:39
[INFO] [stderr]   stack backtrace:
[INFO] [stderr]      0:     0x55be4286de31 - std::backtrace_rs::backtrace::libunwind::trace::ha9d9de1bf4176bfa
[INFO] [stderr]                                  at /rustc/e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
[INFO] [stderr]      1:     0x55be4286de31 - std::backtrace_rs::backtrace::trace_unsynchronized::h165c36ef694ada1c
[INFO] [stderr]                                  at /rustc/e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
[INFO] [stderr]      2:     0x55be4286de31 - std::sys_common::backtrace::_print_fmt::h4d89c7ce1e89b43d
[INFO] [stderr]                                  at /rustc/e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682/library/std/src/sys_common/backtrace.rs:65:5
[INFO] [stderr]      3:     0x55be4286de31 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hfc68e8a2f3b7b37c
[INFO] [stderr]                                  at /rustc/e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682/library/std/src/sys_common/backtrace.rs:44:22
[INFO] [stderr]      4:     0x55be4288a9df - core::fmt::rt::Argument::fmt::hc7dd5538f3de21b7
[INFO] [stderr]                                  at /rustc/e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682/library/core/src/fmt/rt.rs:138:9
[INFO] [stderr]      5:     0x55be4288a9df - core::fmt::write::hac9705ca9b43c249
[INFO] [stderr]                                  at /rustc/e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682/library/core/src/fmt/mod.rs:1094:21
[INFO] [stderr]      6:     0x55be4286b9c1 - std::io::Write::write_fmt::h7bc9466b47d6774b
[INFO] [stderr]                                  at /rustc/e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682/library/std/src/io/mod.rs:1713:15
[INFO] [stderr]      7:     0x55be4286dc45 - std::sys_common::backtrace::_print::h03072469d8150f3e
[INFO] [stderr]                                  at /rustc/e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682/library/std/src/sys_common/backtrace.rs:47:5
[INFO] [stderr]      8:     0x55be4286dc45 - std::sys_common::backtrace::print::hd0f67791f02b87ae
[INFO] [stderr]                                  at /rustc/e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682/library/std/src/sys_common/backtrace.rs:34:9
[INFO] [stderr]      9:     0x55be4286efc7 - std::panicking::default_hook::{{closure}}::h7c8ccb2c703d1528
[INFO] [stderr]     10:     0x55be4286edb4 - std::panicking::default_hook::h770c31d58b53801e
[INFO] [stderr]                                  at /rustc/e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682/library/std/src/panicking.rs:288:9
[INFO] [stderr]     11:     0x55be4286f47c - std::panicking::rust_panic_with_hook::hb50e58c42f5187f2
[INFO] [stderr]                                  at /rustc/e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682/library/std/src/panicking.rs:705:13
[INFO] [stderr]     12:     0x55be4286f377 - std::panicking::begin_panic_handler::{{closure}}::h4d6093b91efbd52e
[INFO] [stderr]                                  at /rustc/e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682/library/std/src/panicking.rs:597:13
[INFO] [stderr]     13:     0x55be4286e266 - std::sys_common::backtrace::__rust_end_short_backtrace::h318963d1ef4510cb
[INFO] [stderr]                                  at /rustc/e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682/library/std/src/sys_common/backtrace.rs:151:18
[INFO] [stderr]     14:     0x55be4286f0c2 - rust_begin_unwind
[INFO] [stderr]                                  at /rustc/e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682/library/std/src/panicking.rs:593:5
[INFO] [stderr]     15:     0x55be427e56b3 - core::panicking::panic_fmt::h6ce9f4b93775846b
[INFO] [stderr]                                  at /rustc/e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682/library/core/src/panicking.rs:67:14
[INFO] [stderr]     16:     0x55be427e5b83 - core::result::unwrap_failed::h45c53cbae19f42f6
[INFO] [stderr]                                  at /rustc/e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682/library/core/src/result.rs:1651:5
[INFO] [stderr]     17:     0x55be427f1ecc - core::result::Result<T,E>::unwrap::h6184f84b6d32fb48
[INFO] [stderr]     18:     0x55be427e8b5d - skeptic::run::h8de3d2f54e69efdf
[INFO] [stderr]     19:     0x55be427e7ace - skeptic::generate_doc_tests::h4342f9a25c6c9f9b
[INFO] [stderr]     20:     0x55be427e6e79 - build_script_build::main::h45cbf63f47d73dfa
[INFO] [stderr]     21:     0x55be427e6f73 - core::ops::function::FnOnce::call_once::h452d14a91b98c733
[INFO] [stderr]     22:     0x55be427e71b6 - std::sys_common::backtrace::__rust_begin_short_backtrace::hd4a087c111a38458
[INFO] [stderr]     23:     0x55be427e6c89 - std::rt::lang_start::{{closure}}::ha3b456920ba59da0
[INFO] [stderr]     24:     0x55be42868955 - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::hb332f02ff9fc81e2
[INFO] [stderr]                                  at /rustc/e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682/library/core/src/ops/function.rs:284:13
[INFO] [stderr]     25:     0x55be42868955 - std::panicking::try::do_call::hed879afea606d968
[INFO] [stderr]                                  at /rustc/e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682/library/std/src/panicking.rs:500:40
[INFO] [stderr]     26:     0x55be42868955 - std::panicking::try::h395a878f3e4bd2f0
[INFO] [stderr]                                  at /rustc/e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682/library/std/src/panicking.rs:464:19
[INFO] [stderr]     27:     0x55be42868955 - std::panic::catch_unwind::hb44b6ea043448d57
[INFO] [stderr]                                  at /rustc/e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682/library/std/src/panic.rs:142:14
[INFO] [stderr]     28:     0x55be42868955 - std::rt::lang_start_internal::{{closure}}::h6184ba9e5b3e5fbf
[INFO] [stderr]                                  at /rustc/e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682/library/std/src/rt.rs:148:48
[INFO] [stderr]     29:     0x55be42868955 - std::panicking::try::do_call::h8b2c97d4d3608274
[INFO] [stderr]                                  at /rustc/e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682/library/std/src/panicking.rs:500:40
[INFO] [stderr]     30:     0x55be42868955 - std::panicking::try::hfa4cc536e097f1fe
[INFO] [stderr]                                  at /rustc/e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682/library/std/src/panicking.rs:464:19
[INFO] [stderr]     31:     0x55be42868955 - std::panic::catch_unwind::ha3e2192625bb4844
[INFO] [stderr]                                  at /rustc/e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682/library/std/src/panic.rs:142:14
[INFO] [stderr]     32:     0x55be42868955 - std::rt::lang_start_internal::hbd6687884d030770
[INFO] [stderr]                                  at /rustc/e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682/library/std/src/rt.rs:148:20
[INFO] [stderr]     33:     0x55be427e6c67 - std::rt::lang_start::h5b7c6aaa029169b0
[INFO] [stderr]     34:     0x55be427e6f55 - main
[INFO] [stderr]     35:     0x7f9387311d90 - <unknown>
[INFO] [stderr]     36:     0x7f9387311e40 - __libc_start_main
[INFO] [stderr]     37:     0x55be427e5e85 - _start
[INFO] [stderr]     38:                0x0 - <unknown>
[INFO] running `Command { std: "docker" "inspect" "1dcac06ff1f83ee0b7e5d90e64a8dabc2df39afb4e75e488cb3dccdb6f0ba34d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1dcac06ff1f83ee0b7e5d90e64a8dabc2df39afb4e75e488cb3dccdb6f0ba34d", kill_on_drop: false }`
[INFO] [stdout] 1dcac06ff1f83ee0b7e5d90e64a8dabc2df39afb4e75e488cb3dccdb6f0ba34d
