[INFO] cloning repository https://github.com/Ninja-21-dev/Rust-Koans
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Ninja-21-dev/Rust-Koans" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNinja-21-dev%2FRust-Koans", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNinja-21-dev%2FRust-Koans'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 56949109c8f9e25d7ef9cadb33b70e4505eaa5a2
[INFO] documenting Ninja-21-dev/Rust-Koans against 1.75.0 for beta-1.76-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNinja-21-dev%2FRust-Koans" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Ninja-21-dev/Rust-Koans on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Ninja-21-dev/Rust-Koans
[INFO] finished tweaking git repo https://github.com/Ninja-21-dev/Rust-Koans
[INFO] tweaked toml for git repo https://github.com/Ninja-21-dev/Rust-Koans written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/Ninja-21-dev/Rust-Koans 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" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0d6a11fc7e8c708f2cd4f2afbc9f5edf96012514c500abb9b4233bf6efca3c4f
[INFO] running `Command { std: "docker" "start" "-a" "0d6a11fc7e8c708f2cd4f2afbc9f5edf96012514c500abb9b4233bf6efca3c4f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0d6a11fc7e8c708f2cd4f2afbc9f5edf96012514c500abb9b4233bf6efca3c4f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0d6a11fc7e8c708f2cd4f2afbc9f5edf96012514c500abb9b4233bf6efca3c4f", kill_on_drop: false }`
[INFO] [stdout] 0d6a11fc7e8c708f2cd4f2afbc9f5edf96012514c500abb9b4233bf6efca3c4f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c623eac436984c06acdc0a9c70962871af6c7193b0a45a9100ee2ab0d6ea0a8f
[INFO] running `Command { std: "docker" "start" "-a" "c623eac436984c06acdc0a9c70962871af6c7193b0a45a9100ee2ab0d6ea0a8f", kill_on_drop: false }`
[INFO] [stderr]    Compiling koans v0.2.2 (/opt/rustwide/workdir)
[INFO] [stderr] error: failed to run custom build command for `koans v0.2.2 (/opt/rustwide/workdir)`
[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/koans-a332ee0a99f61485/build-script-build` (exit status: 101)
[INFO] [stderr]   --- stderr
[INFO] [stderr]   thread 'main' panicked at build.rs:13:22:
[INFO] [stderr]   Read-only file system (os error 30)
[INFO] [stderr]   stack backtrace:
[INFO] [stderr]      0:     0x55fc9e6eea3c - std::backtrace_rs::backtrace::libunwind::trace::ha637c64ce894333a
[INFO] [stderr]                                  at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
[INFO] [stderr]      1:     0x55fc9e6eea3c - std::backtrace_rs::backtrace::trace_unsynchronized::h47f62dea28e0c88d
[INFO] [stderr]                                  at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
[INFO] [stderr]      2:     0x55fc9e6eea3c - std::sys_common::backtrace::_print_fmt::h9eef0abe20ede486
[INFO] [stderr]                                  at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/sys_common/backtrace.rs:67:5
[INFO] [stderr]      3:     0x55fc9e6eea3c - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hed7f999df88cc644
[INFO] [stderr]                                  at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/sys_common/backtrace.rs:44:22
[INFO] [stderr]      4:     0x55fc9e70e3d0 - core::fmt::rt::Argument::fmt::h1539a9308b8d058d
[INFO] [stderr]                                  at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/fmt/rt.rs:142:9
[INFO] [stderr]      5:     0x55fc9e70e3d0 - core::fmt::write::h3a39390d8560d9c9
[INFO] [stderr]                                  at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/fmt/mod.rs:1120:17
[INFO] [stderr]      6:     0x55fc9e6eceef - std::io::Write::write_fmt::h5fc9997dfe05f882
[INFO] [stderr]                                  at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/io/mod.rs:1762:15
[INFO] [stderr]      7:     0x55fc9e6ee824 - std::sys_common::backtrace::_print::h894006fb5c6f3d45
[INFO] [stderr]                                  at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/sys_common/backtrace.rs:47:5
[INFO] [stderr]      8:     0x55fc9e6ee824 - std::sys_common::backtrace::print::h23a2d212c6fff936
[INFO] [stderr]                                  at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/sys_common/backtrace.rs:34:9
[INFO] [stderr]      9:     0x55fc9e6efd37 - std::panicking::default_hook::{{closure}}::h8a1d2ee00185001a
[INFO] [stderr]     10:     0x55fc9e6efa9f - std::panicking::default_hook::h6038f2eba384e475
[INFO] [stderr]                                  at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panicking.rs:292:9
[INFO] [stderr]     11:     0x55fc9e6f01b8 - std::panicking::rust_panic_with_hook::h2b5517d590cab22e
[INFO] [stderr]                                  at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panicking.rs:779:13
[INFO] [stderr]     12:     0x55fc9e6f009e - std::panicking::begin_panic_handler::{{closure}}::h233112c06e0ef43e
[INFO] [stderr]                                  at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panicking.rs:657:13
[INFO] [stderr]     13:     0x55fc9e6eef06 - std::sys_common::backtrace::__rust_end_short_backtrace::h6e893f24d7ebbff8
[INFO] [stderr]                                  at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/sys_common/backtrace.rs:170:18
[INFO] [stderr]     14:     0x55fc9e6efe02 - rust_begin_unwind
[INFO] [stderr]                                  at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panicking.rs:645:5
[INFO] [stderr]     15:     0x55fc9e6d1df5 - core::panicking::panic_fmt::hbf0e066aabfa482c
[INFO] [stderr]                                  at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/panicking.rs:72:14
[INFO] [stderr]     16:     0x55fc9e6d3b15 - core::panicking::panic_display::h85d86267d61434de
[INFO] [stderr]     17:     0x55fc9e6d3f25 - build_script_build::main::hfe0c69e61d17fc06
[INFO] [stderr]     18:     0x55fc9e6d35a3 - core::ops::function::FnOnce::call_once::habc1a4c2e2f60977
[INFO] [stderr]     19:     0x55fc9e6d2696 - std::sys_common::backtrace::__rust_begin_short_backtrace::h53800048520bc214
[INFO] [stderr]     20:     0x55fc9e6d31a9 - std::rt::lang_start::{{closure}}::hc997188ed00d71c3
[INFO] [stderr]     21:     0x55fc9e6eaa27 - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::hd95060ecd5e1ca24
[INFO] [stderr]                                  at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/ops/function.rs:284:13
[INFO] [stderr]     22:     0x55fc9e6eaa27 - std::panicking::try::do_call::h6e8cf51db32a6e4b
[INFO] [stderr]                                  at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panicking.rs:552:40
[INFO] [stderr]     23:     0x55fc9e6eaa27 - std::panicking::try::h3a52eefe24fe3c29
[INFO] [stderr]                                  at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panicking.rs:516:19
[INFO] [stderr]     24:     0x55fc9e6eaa27 - std::panic::catch_unwind::h24c28c23c02c3841
[INFO] [stderr]                                  at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panic.rs:142:14
[INFO] [stderr]     25:     0x55fc9e6eaa27 - std::rt::lang_start_internal::{{closure}}::h705d3c9cbc06ef47
[INFO] [stderr]                                  at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/rt.rs:148:48
[INFO] [stderr]     26:     0x55fc9e6eaa27 - std::panicking::try::do_call::ha21f52ba13158470
[INFO] [stderr]                                  at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panicking.rs:552:40
[INFO] [stderr]     27:     0x55fc9e6eaa27 - std::panicking::try::h5581346bf6aeb1f8
[INFO] [stderr]                                  at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panicking.rs:516:19
[INFO] [stderr]     28:     0x55fc9e6eaa27 - std::panic::catch_unwind::h7919645a6b72e25b
[INFO] [stderr]                                  at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panic.rs:142:14
[INFO] [stderr]     29:     0x55fc9e6eaa27 - std::rt::lang_start_internal::h12de51168669836e
[INFO] [stderr]                                  at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/rt.rs:148:20
[INFO] [stderr]     30:     0x55fc9e6d3187 - std::rt::lang_start::hccde4d4644a5365e
[INFO] [stderr]     31:     0x55fc9e6d3f45 - main
[INFO] [stderr]     32:     0x7fb7b5178d90 - <unknown>
[INFO] [stderr]     33:     0x7fb7b5178e40 - __libc_start_main
[INFO] [stderr]     34:     0x55fc9e6d2515 - _start
[INFO] [stderr]     35:                0x0 - <unknown>
[INFO] running `Command { std: "docker" "inspect" "c623eac436984c06acdc0a9c70962871af6c7193b0a45a9100ee2ab0d6ea0a8f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c623eac436984c06acdc0a9c70962871af6c7193b0a45a9100ee2ab0d6ea0a8f", kill_on_drop: false }`
[INFO] [stdout] c623eac436984c06acdc0a9c70962871af6c7193b0a45a9100ee2ab0d6ea0a8f
