[INFO] cloning repository https://github.com/meganriley/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/meganriley/rust-koans" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmeganriley%2Frust-koans", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmeganriley%2Frust-koans'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 150ce4defb1d8277f8fbc4ab044685598430a926
[INFO] testing meganriley/rust-koans/150ce4defb1d8277f8fbc4ab044685598430a926 against master#1871252fc8bb672d40787e67404e6eaae7059369 for pr-125151
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmeganriley%2Frust-koans" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/meganriley/rust-koans on toolchain 1871252fc8bb672d40787e67404e6eaae7059369
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1871252fc8bb672d40787e67404e6eaae7059369" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/meganriley/rust-koans
[INFO] finished tweaking git repo https://github.com/meganriley/rust-koans
[INFO] tweaked toml for git repo https://github.com/meganriley/rust-koans written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/meganriley/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" "+1871252fc8bb672d40787e67404e6eaae7059369" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:59a85a07ab18ca8720692f8e61effa1c651d9e2ca591e072c2b212bb91a6b8b5" "/opt/rustwide/cargo-home/bin/cargo" "+1871252fc8bb672d40787e67404e6eaae7059369" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8396c7eb5842edfd65ba8e4d4b57fc98cb684c866631a23ec349b079ec019b0e
[INFO] running `Command { std: "docker" "start" "-a" "8396c7eb5842edfd65ba8e4d4b57fc98cb684c866631a23ec349b079ec019b0e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8396c7eb5842edfd65ba8e4d4b57fc98cb684c866631a23ec349b079ec019b0e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8396c7eb5842edfd65ba8e4d4b57fc98cb684c866631a23ec349b079ec019b0e", kill_on_drop: false }`
[INFO] [stdout] 8396c7eb5842edfd65ba8e4d4b57fc98cb684c866631a23ec349b079ec019b0e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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=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@sha256:59a85a07ab18ca8720692f8e61effa1c651d9e2ca591e072c2b212bb91a6b8b5" "/opt/rustwide/cargo-home/bin/cargo" "+1871252fc8bb672d40787e67404e6eaae7059369" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 95ad2219a6c45fe983fd8a9b5bd27bbd2dad69a67c1aacd93a174b354553c2a6
[INFO] running `Command { std: "docker" "start" "-a" "95ad2219a6c45fe983fd8a9b5bd27bbd2dad69a67c1aacd93a174b354553c2a6", 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-6423e879e0081c5b/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:     0x55cf87cf7a85 - std::backtrace_rs::backtrace::libunwind::trace::h59d96bdb08384354
[INFO] [stderr]                                  at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/../../backtrace/src/backtrace/libunwind.rs:105:5
[INFO] [stderr]      1:     0x55cf87cf7a85 - std::backtrace_rs::backtrace::trace_unsynchronized::h9cf5becacfc93fba
[INFO] [stderr]                                  at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
[INFO] [stderr]      2:     0x55cf87cf7a85 - std::sys_common::backtrace::_print_fmt::h10b76d10405dbd48
[INFO] [stderr]                                  at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/sys_common/backtrace.rs:68:5
[INFO] [stderr]      3:     0x55cf87cf7a85 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h6ed9e62a156d84e4
[INFO] [stderr]                                  at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/sys_common/backtrace.rs:44:22
[INFO] [stderr]      4:     0x55cf87d14c0b - core::fmt::rt::Argument::fmt::h645c680983f03c9f
[INFO] [stderr]                                  at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/core/src/fmt/rt.rs:165:63
[INFO] [stderr]      5:     0x55cf87d14c0b - core::fmt::write::h8bcd80919a02be29
[INFO] [stderr]                                  at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/core/src/fmt/mod.rs:1169:21
[INFO] [stderr]      6:     0x55cf87cf5d0f - std::io::Write::write_fmt::hed769ca6c29434ec
[INFO] [stderr]                                  at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/io/mod.rs:1835:15
[INFO] [stderr]      7:     0x55cf87cf785e - std::sys_common::backtrace::_print::h6306f131a28d62b0
[INFO] [stderr]                                  at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/sys_common/backtrace.rs:47:5
[INFO] [stderr]      8:     0x55cf87cf785e - std::sys_common::backtrace::print::h7079288e0a26dfcc
[INFO] [stderr]                                  at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/sys_common/backtrace.rs:34:9
[INFO] [stderr]      9:     0x55cf87cf8bc9 - std::panicking::default_hook::{{closure}}::hb063ecec81a736ba
[INFO] [stderr]     10:     0x55cf87cf890d - std::panicking::default_hook::hd56ee406bf547b5c
[INFO] [stderr]                                  at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/panicking.rs:298:9
[INFO] [stderr]     11:     0x55cf87cf9063 - std::panicking::rust_panic_with_hook::h624aa3ca42ebb8f2
[INFO] [stderr]                                  at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/panicking.rs:795:13
[INFO] [stderr]     12:     0x55cf87cf8f44 - std::panicking::begin_panic_handler::{{closure}}::hbc4e76194a5e287c
[INFO] [stderr]                                  at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/panicking.rs:664:13
[INFO] [stderr]     13:     0x55cf87cf7f49 - std::sys_common::backtrace::__rust_end_short_backtrace::h847fedc9d1ff7b6d
[INFO] [stderr]                                  at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/sys_common/backtrace.rs:171:18
[INFO] [stderr]     14:     0x55cf87cf8c77 - rust_begin_unwind
[INFO] [stderr]                                  at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/panicking.rs:652:5
[INFO] [stderr]     15:     0x55cf87cdbb63 - core::panicking::panic_fmt::hec11a924b87ce965
[INFO] [stderr]                                  at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/core/src/panicking.rs:72:14
[INFO] [stderr]     16:     0x55cf87cddb08 - core::panicking::panic_display::h57fd2602cb08e460
[INFO] [stderr]     17:     0x55cf87cde16e - build_script_build::main::h34d982cf3e0d7d50
[INFO] [stderr]     18:     0x55cf87cdd523 - core::ops::function::FnOnce::call_once::h86ebc986b1915569
[INFO] [stderr]     19:     0x55cf87cdc3f6 - std::sys_common::backtrace::__rust_begin_short_backtrace::haefd6b2fadd2471c
[INFO] [stderr]     20:     0x55cf87cdd069 - std::rt::lang_start::{{closure}}::h7a06ef576de8d182
[INFO] [stderr]     21:     0x55cf87cf3a1d - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::h239f0051f1e18680
[INFO] [stderr]                                  at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/core/src/ops/function.rs:284:13
[INFO] [stderr]     22:     0x55cf87cf3a1d - std::panicking::try::do_call::hf7072797cbfea7fa
[INFO] [stderr]                                  at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/panicking.rs:559:40
[INFO] [stderr]     23:     0x55cf87cf3a1d - std::panicking::try::h3a37e38691a5244b
[INFO] [stderr]                                  at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/panicking.rs:523:19
[INFO] [stderr]     24:     0x55cf87cf3a1d - std::panic::catch_unwind::hc7cc1460e4236209
[INFO] [stderr]                                  at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/panic.rs:149:14
[INFO] [stderr]     25:     0x55cf87cf3a1d - std::rt::lang_start_internal::{{closure}}::hce632608b277cffc
[INFO] [stderr]                                  at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/rt.rs:141:48
[INFO] [stderr]     26:     0x55cf87cf3a1d - std::panicking::try::do_call::hafc0f13e6abd9d79
[INFO] [stderr]                                  at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/panicking.rs:559:40
[INFO] [stderr]     27:     0x55cf87cf3a1d - std::panicking::try::h67b8f1800ef15799
[INFO] [stderr]                                  at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/panicking.rs:523:19
[INFO] [stderr]     28:     0x55cf87cf3a1d - std::panic::catch_unwind::he5b260dc522c68be
[INFO] [stderr]                                  at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/panic.rs:149:14
[INFO] [stderr]     29:     0x55cf87cf3a1d - std::rt::lang_start_internal::hf119eb75d1ffe221
[INFO] [stderr]                                  at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/rt.rs:141:20
[INFO] [stderr]     30:     0x55cf87cdd047 - std::rt::lang_start::h7da77a0b32db7944
[INFO] [stderr]     31:     0x55cf87cde195 - main
[INFO] [stderr]     32:     0x7f4e933edd90 - <unknown>
[INFO] [stderr]     33:     0x7f4e933ede40 - __libc_start_main
[INFO] [stderr]     34:     0x55cf87cdc155 - _start
[INFO] [stderr]     35:                0x0 - <unknown>
[INFO] running `Command { std: "docker" "inspect" "95ad2219a6c45fe983fd8a9b5bd27bbd2dad69a67c1aacd93a174b354553c2a6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "95ad2219a6c45fe983fd8a9b5bd27bbd2dad69a67c1aacd93a174b354553c2a6", kill_on_drop: false }`
[INFO] [stdout] 95ad2219a6c45fe983fd8a9b5bd27bbd2dad69a67c1aacd93a174b354553c2a6
