[INFO] cloning repository https://github.com/bitcartel/rust-koans-solutions
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/bitcartel/rust-koans-solutions" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbitcartel%2Frust-koans-solutions", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbitcartel%2Frust-koans-solutions'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] fa1cc79b191627ba13abd5c639ffff97f6c9e08a
[INFO] checking bitcartel/rust-koans-solutions against f1c52bf13c990fc425c542cc90a0396a87db24ba for pr-164812
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbitcartel%2Frust-koans-solutions" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/bitcartel/rust-koans-solutions
[INFO] finished tweaking git repo https://github.com/bitcartel/rust-koans-solutions
[INFO] tweaked toml for git repo https://github.com/bitcartel/rust-koans-solutions written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/bitcartel/rust-koans-solutions on toolchain f1c52bf13c990fc425c542cc90a0396a87db24ba
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f1c52bf13c990fc425c542cc90a0396a87db24ba" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/bitcartel/rust-koans-solutions 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" "+f1c52bf13c990fc425c542cc90a0396a87db24ba" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: Cargo.toml: `package.edition` is unspecified, defaulting to `2015` while the latest is `2024`
[INFO] [stderr] warning: `koans` (manifest) generated 1 warning
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:c0af3998e971868164375a7dfb646c9933ddd1a3bdb00fa2041266763dc1eeab" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] d2067d196ffa5c1cbc37e09feeb251b5144712b093f2c65679f96e1327a13356
[INFO] running `Command { std: "docker" "start" "d2067d196ffa5c1cbc37e09feeb251b5144712b093f2c65679f96e1327a13356", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d2067d196ffa5c1cbc37e09feeb251b5144712b093f2c65679f96e1327a13356", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "d2067d196ffa5c1cbc37e09feeb251b5144712b093f2c65679f96e1327a13356" "/opt/rustwide/cargo-home/bin/cargo" "+f1c52bf13c990fc425c542cc90a0396a87db24ba" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d2067d196ffa5c1cbc37e09feeb251b5144712b093f2c65679f96e1327a13356", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-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" "-w" "/opt/rustwide/workdir" "--user" "0:0" "d2067d196ffa5c1cbc37e09feeb251b5144712b093f2c65679f96e1327a13356" "/opt/rustwide/cargo-home/bin/cargo" "+f1c52bf13c990fc425c542cc90a0396a87db24ba" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] warning: Cargo.toml: `package.edition` is unspecified, defaulting to `2015` while the latest is `2024`
[INFO] [stderr] warning: `koans` (manifest) generated 1 warning
[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/4a28024071439e5c/out/build_script_build` (exit status: 101)
[INFO] [stderr]   --- stderr
[INFO] [stderr] 
[INFO] [stderr]   thread 'main' (81) panicked at build.rs:13:22:
[INFO] [stderr]   Read-only file system (os error 30)
[INFO] [stderr]   stack backtrace:
[INFO] [stderr]      0:     0x58f371e77ca1 - std[f468023bfb101e9]::backtrace_rs::backtrace::libunwind::trace
[INFO] [stderr]                                  at /rustc/f1c52bf13c990fc425c542cc90a0396a87db24ba/library/std/src/../../backtrace/src/backtrace/libunwind.rs:117:9
[INFO] [stderr]      1:     0x58f371e77ca1 - std[f468023bfb101e9]::backtrace_rs::backtrace::trace_unsynchronized::<std[f468023bfb101e9]::sys::backtrace::_print_fmt::{closure#1}>
[INFO] [stderr]                                  at /rustc/f1c52bf13c990fc425c542cc90a0396a87db24ba/library/std/src/../../backtrace/src/backtrace/mod.rs:66:14
[INFO] [stderr]      2:     0x58f371e77ca1 - std[f468023bfb101e9]::sys::backtrace::_print_fmt
[INFO] [stderr]                                  at /rustc/f1c52bf13c990fc425c542cc90a0396a87db24ba/library/std/src/sys/backtrace.rs:74:9
[INFO] [stderr]      3:     0x58f371e77ca1 - <<std[f468023bfb101e9]::sys::backtrace::BacktraceLock>::print::DisplayBacktrace as core[fe826646241d7baf]::fmt::Display>::fmt
[INFO] [stderr]                                  at /rustc/f1c52bf13c990fc425c542cc90a0396a87db24ba/library/std/src/sys/backtrace.rs:44:26
[INFO] [stderr]      4:     0x58f371e8827a - <core[fe826646241d7baf]::fmt::rt::Argument>::fmt
[INFO] [stderr]                                  at /rustc/f1c52bf13c990fc425c542cc90a0396a87db24ba/library/core/src/fmt/rt.rs:152:76
[INFO] [stderr]      5:     0x58f371e8827a - core[fe826646241d7baf]::fmt::write
[INFO] [stderr]      6:     0x58f371e7afdc - core[fe826646241d7baf]::io::write::default_write_fmt::<std[f468023bfb101e9]::sys::stdio::unix::Stderr>
[INFO] [stderr]                                  at /rustc/f1c52bf13c990fc425c542cc90a0396a87db24ba/library/core/src/io/write.rs:402:11
[INFO] [stderr]      7:     0x58f371e7afdc - <std[f468023bfb101e9]::sys::stdio::unix::Stderr as core[fe826646241d7baf]::io::write::Write>::write_fmt
[INFO] [stderr]                                  at /rustc/f1c52bf13c990fc425c542cc90a0396a87db24ba/library/core/src/io/write.rs:335:13
[INFO] [stderr]      8:     0x58f371e62706 - <std[f468023bfb101e9]::sys::backtrace::BacktraceLock>::print
[INFO] [stderr]                                  at /rustc/f1c52bf13c990fc425c542cc90a0396a87db24ba/library/std/src/sys/backtrace.rs:47:9
[INFO] [stderr]      9:     0x58f371e62706 - std[f468023bfb101e9]::panicking::default_hook::{closure#0}
[INFO] [stderr]                                  at /rustc/f1c52bf13c990fc425c542cc90a0396a87db24ba/library/std/src/panicking.rs:289:27
[INFO] [stderr]     10:     0x58f371e74671 - std[f468023bfb101e9]::panicking::default_hook
[INFO] [stderr]                                  at /rustc/f1c52bf13c990fc425c542cc90a0396a87db24ba/library/std/src/panicking.rs:316:9
[INFO] [stderr]     11:     0x58f371e7482b - std[f468023bfb101e9]::panicking::panic_with_hook
[INFO] [stderr]                                  at /rustc/f1c52bf13c990fc425c542cc90a0396a87db24ba/library/std/src/panicking.rs:811:13
[INFO] [stderr]     12:     0x58f371e627b2 - std[f468023bfb101e9]::panicking::panic_handler::{closure#0}
[INFO] [stderr]                                  at /rustc/f1c52bf13c990fc425c542cc90a0396a87db24ba/library/std/src/panicking.rs:685:13
[INFO] [stderr]     13:     0x58f371e5b609 - std[f468023bfb101e9]::sys::backtrace::__rust_end_short_backtrace::<std[f468023bfb101e9]::panicking::panic_handler::{closure#0}, !>
[INFO] [stderr]                                  at /rustc/f1c52bf13c990fc425c542cc90a0396a87db24ba/library/std/src/sys/backtrace.rs:182:18
[INFO] [stderr]     14:     0x58f371e62efd - __rustc[6b4d05bc762413]::rust_begin_unwind
[INFO] [stderr]                                  at /rustc/f1c52bf13c990fc425c542cc90a0396a87db24ba/library/std/src/panicking.rs:676:5
[INFO] [stderr]     15:     0x58f371e8892c - core[fe826646241d7baf]::panicking::panic_fmt
[INFO] [stderr]                                  at /rustc/f1c52bf13c990fc425c542cc90a0396a87db24ba/library/core/src/panicking.rs:80:14
[INFO] [stderr]     16:     0x58f371e4ff52 - core[fe826646241d7baf]::panicking::panic_display::<core[fe826646241d7baf]::io::error::Error>
[INFO] [stderr]     17:     0x58f371e50513 - build_script_build[9ca7d1175a674ce7]::main
[INFO] [stderr]     18:     0x58f371e51343 - <fn() as core[fe826646241d7baf]::ops::function::FnOnce<()>>::call_once
[INFO] [stderr]     19:     0x58f371e4ff5e - std[f468023bfb101e9]::sys::backtrace::__rust_begin_short_backtrace::<fn(), ()>
[INFO] [stderr]     20:     0x58f371e50349 - std[f468023bfb101e9]::rt::lang_start::<()>::{closure#0}
[INFO] [stderr]     21:     0x58f371e73e28 - <&dyn core[fe826646241d7baf]::ops::function::Fn<(), Output = i32> + core[fe826646241d7baf]::panic::unwind_safe::RefUnwindSafe + core[fe826646241d7baf]::marker::Sync as core[fe826646241d7baf]::ops::function::FnOnce<()>>::call_once
[INFO] [stderr]                                  at /rustc/f1c52bf13c990fc425c542cc90a0396a87db24ba/library/core/src/ops/function.rs:287:21
[INFO] [stderr]     22:     0x58f371e73e28 - std[f468023bfb101e9]::panicking::catch_unwind::do_call::<&dyn core[fe826646241d7baf]::ops::function::Fn<(), Output = i32> + core[fe826646241d7baf]::panic::unwind_safe::RefUnwindSafe + core[fe826646241d7baf]::marker::Sync, i32>
[INFO] [stderr]                                  at /rustc/f1c52bf13c990fc425c542cc90a0396a87db24ba/library/std/src/panicking.rs:573:43
[INFO] [stderr]     23:     0x58f371e73e28 - std[f468023bfb101e9]::panicking::catch_unwind::<i32, &dyn core[fe826646241d7baf]::ops::function::Fn<(), Output = i32> + core[fe826646241d7baf]::panic::unwind_safe::RefUnwindSafe + core[fe826646241d7baf]::marker::Sync>
[INFO] [stderr]                                  at /rustc/f1c52bf13c990fc425c542cc90a0396a87db24ba/library/std/src/panicking.rs:541:19
[INFO] [stderr]     24:     0x58f371e73e28 - std[f468023bfb101e9]::panic::catch_unwind::<&dyn core[fe826646241d7baf]::ops::function::Fn<(), Output = i32> + core[fe826646241d7baf]::panic::unwind_safe::RefUnwindSafe + core[fe826646241d7baf]::marker::Sync, i32>
[INFO] [stderr]                                  at /rustc/f1c52bf13c990fc425c542cc90a0396a87db24ba/library/std/src/panic.rs:359:14
[INFO] [stderr]     25:     0x58f371e73e28 - std[f468023bfb101e9]::rt::lang_start_internal::{closure#0}
[INFO] [stderr]                                  at /rustc/f1c52bf13c990fc425c542cc90a0396a87db24ba/library/std/src/rt.rs:175:24
[INFO] [stderr]     26:     0x58f371e73e28 - std[f468023bfb101e9]::panicking::catch_unwind::do_call::<std[f468023bfb101e9]::rt::lang_start_internal::{closure#0}, isize>
[INFO] [stderr]                                  at /rustc/f1c52bf13c990fc425c542cc90a0396a87db24ba/library/std/src/panicking.rs:573:43
[INFO] [stderr]     27:     0x58f371e73e28 - std[f468023bfb101e9]::panicking::catch_unwind::<isize, std[f468023bfb101e9]::rt::lang_start_internal::{closure#0}>
[INFO] [stderr]                                  at /rustc/f1c52bf13c990fc425c542cc90a0396a87db24ba/library/std/src/panicking.rs:541:19
[INFO] [stderr]     28:     0x58f371e73e28 - std[f468023bfb101e9]::panic::catch_unwind::<std[f468023bfb101e9]::rt::lang_start_internal::{closure#0}, isize>
[INFO] [stderr]                                  at /rustc/f1c52bf13c990fc425c542cc90a0396a87db24ba/library/std/src/panic.rs:359:14
[INFO] [stderr]     29:     0x58f371e73e28 - std[f468023bfb101e9]::rt::lang_start_internal
[INFO] [stderr]                                  at /rustc/f1c52bf13c990fc425c542cc90a0396a87db24ba/library/std/src/rt.rs:171:5
[INFO] [stderr]     30:     0x58f371e4fde1 - std[f468023bfb101e9]::rt::lang_start::<()>
[INFO] [stderr]     31:     0x58f371e51805 - main
[INFO] [stderr]     32:     0x7f347d6b3601 - <unknown>
[INFO] [stderr]     33:     0x7f347d6b3718 - __libc_start_main
[INFO] [stderr]     34:     0x58f371e4fc95 - _start
[INFO] [stderr]     35:                0x0 - <unknown>
[INFO] running `Command { std: "docker" "inspect" "d2067d196ffa5c1cbc37e09feeb251b5144712b093f2c65679f96e1327a13356", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d2067d196ffa5c1cbc37e09feeb251b5144712b093f2c65679f96e1327a13356", kill_on_drop: false }`
[INFO] [stdout] d2067d196ffa5c1cbc37e09feeb251b5144712b093f2c65679f96e1327a13356