[INFO] cloning repository https://github.com/hatchling13/rustlings-solution
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/hatchling13/rustlings-solution" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhatchling13%2Frustlings-solution", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhatchling13%2Frustlings-solution'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 002382b8de9963ec01151b4add982065b278ae93
[INFO] testing hatchling13/rustlings-solution against 1.86.0 for beta-1.87-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhatchling13%2Frustlings-solution" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/hatchling13/rustlings-solution on toolchain 1.86.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.86.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/hatchling13/rustlings-solution
[INFO] finished tweaking git repo https://github.com/hatchling13/rustlings-solution
[INFO] tweaked toml for git repo https://github.com/hatchling13/rustlings-solution written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/hatchling13/rustlings-solution 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" "+1.86.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+1.86.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0348509a46c81452f5f81b733d315e08eecc4ac753c4bdb1d50859e4f6eb7901
[INFO] running `Command { std: "docker" "start" "-a" "0348509a46c81452f5f81b733d315e08eecc4ac753c4bdb1d50859e4f6eb7901", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0348509a46c81452f5f81b733d315e08eecc4ac753c4bdb1d50859e4f6eb7901", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0348509a46c81452f5f81b733d315e08eecc4ac753c4bdb1d50859e4f6eb7901", kill_on_drop: false }`
[INFO] [stdout] 0348509a46c81452f5f81b733d315e08eecc4ac753c4bdb1d50859e4f6eb7901
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+1.86.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0a925d8a4cf7ebf5949992849a18290a98b887e0f964a106087ee5921a8c0dfc
[INFO] running `Command { std: "docker" "start" "-a" "0a925d8a4cf7ebf5949992849a18290a98b887e0f964a106087ee5921a8c0dfc", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.100
[INFO] [stderr]    Compiling proc-macro2 v1.0.28
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.75
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling serde_derive v1.0.129
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling cfg-if v0.1.10
[INFO] [stderr]    Compiling serde v1.0.129
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]    Compiling slab v0.4.4
[INFO] [stderr]    Compiling unicode-segmentation v1.8.0
[INFO] [stderr]    Compiling regex-syntax v0.6.25
[INFO] [stderr]    Compiling lazycell v1.3.0
[INFO] [stderr]    Compiling argh_shared v0.1.5
[INFO] [stderr]    Compiling once_cell v1.10.0
[INFO] [stderr]    Compiling unicode-width v0.1.8
[INFO] [stderr]    Compiling serde_json v1.0.81
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[INFO] [stderr]    Compiling notify v4.0.17
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[INFO] [stderr]    Compiling console v0.15.0
[INFO] [stderr]    Compiling indicatif v0.16.2
[INFO] [stderr]    Compiling argh_derive v0.1.5
[INFO] [stderr]    Compiling argh v0.1.5
[INFO] [stderr]    Compiling toml v0.5.9
[INFO] [stderr]    Compiling rustlings v5.0.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 26.42s
[INFO] running `Command { std: "docker" "inspect" "0a925d8a4cf7ebf5949992849a18290a98b887e0f964a106087ee5921a8c0dfc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0a925d8a4cf7ebf5949992849a18290a98b887e0f964a106087ee5921a8c0dfc", kill_on_drop: false }`
[INFO] [stdout] 0a925d8a4cf7ebf5949992849a18290a98b887e0f964a106087ee5921a8c0dfc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+1.86.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1269e04cbdc22d66a9d70520aa9831b5a7e57f8378a3a053d6e3b6aa78bea03b
[INFO] running `Command { std: "docker" "start" "-a" "1269e04cbdc22d66a9d70520aa9831b5a7e57f8378a3a053d6e3b6aa78bea03b", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling escargot v0.4.0
[INFO] [stderr]    Compiling predicates-core v1.0.2
[INFO] [stderr]    Compiling treeline v0.1.0
[INFO] [stderr]    Compiling normalize-line-endings v0.3.0
[INFO] [stderr]    Compiling difference v2.0.0
[INFO] [stderr]    Compiling predicates-tree v1.0.3
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling float-cmp v0.8.0
[INFO] [stderr]    Compiling predicates v1.0.8
[INFO] [stderr]    Compiling assert_cmd v0.11.1
[INFO] [stderr]    Compiling rustlings v5.0.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 6.58s
[INFO] running `Command { std: "docker" "inspect" "1269e04cbdc22d66a9d70520aa9831b5a7e57f8378a3a053d6e3b6aa78bea03b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1269e04cbdc22d66a9d70520aa9831b5a7e57f8378a3a053d6e3b6aa78bea03b", kill_on_drop: false }`
[INFO] [stdout] 1269e04cbdc22d66a9d70520aa9831b5a7e57f8378a3a053d6e3b6aa78bea03b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+1.86.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] ec8a8933a53044f13c29882c84d451c98cbe7942a7b8e22f2de306bf70ee6340
[INFO] running `Command { std: "docker" "start" "-a" "ec8a8933a53044f13c29882c84d451c98cbe7942a7b8e22f2de306bf70ee6340", kill_on_drop: false }`
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.16s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/rustlings-8d02f68db6a13c8e)
[INFO] [stdout] 
[INFO] [stdout] running 4 tests
[INFO] [stdout] test exercise::test::test_finished_exercise ... ok
[INFO] [stdout] test exercise::test::test_pending_state ... ok
[INFO] [stdout] test exercise::test::test_clean ... FAILED
[INFO] [stdout] test exercise::test::test_exercise_with_output ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- exercise::test::test_clean stdout ----
[INFO] [stdout] 
[INFO] [stdout] thread 'exercise::test::test_clean' panicked at src/exercise.rs:269:36:
[INFO] [stdout] called `Result::unwrap()` on an `Err` value: Os { code: 30, kind: ReadOnlyFilesystem, message: "Read-only file system" }
[INFO] [stdout] stack backtrace:
[INFO] [stdout]    0:     0x55cbe4af4b50 - std::backtrace_rs::backtrace::libunwind::trace::h2b8934d68a0c74cb
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/../../backtrace/src/backtrace/libunwind.rs:117:9
[INFO] [stdout]    1:     0x55cbe4af4b50 - std::backtrace_rs::backtrace::trace_unsynchronized::h72d137991fa6eab8
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/../../backtrace/src/backtrace/mod.rs:66:14
[INFO] [stdout]    2:     0x55cbe4af4b50 - std::sys::backtrace::_print_fmt::h3e831e32e6da920b
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/sys/backtrace.rs:66:9
[INFO] [stdout]    3:     0x55cbe4af4b50 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h6d42cc84fc840290
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/sys/backtrace.rs:39:26
[INFO] [stdout]    4:     0x55cbe4b1b4d3 - core::fmt::rt::Argument::fmt::h7239af9e2199f2a8
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/core/src/fmt/rt.rs:177:76
[INFO] [stdout]    5:     0x55cbe4b1b4d3 - core::fmt::write::h5af61a909e3ec64d
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/core/src/fmt/mod.rs:1449:21
[INFO] [stdout]    6:     0x55cbe4af1c63 - std::io::Write::write_fmt::h64baa9197d9a3b04
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/io/mod.rs:1890:15
[INFO] [stdout]    7:     0x55cbe4af49a2 - std::sys::backtrace::BacktraceLock::print::h555579e7396c26ac
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/sys/backtrace.rs:42:9
[INFO] [stdout]    8:     0x55cbe4af5f7f - std::panicking::default_hook::{{closure}}::h9128866118196224
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/panicking.rs:298:22
[INFO] [stdout]    9:     0x55cbe4af5d98 - std::panicking::default_hook::h52e9e7314e0255f6
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/panicking.rs:322:9
[INFO] [stdout]   10:     0x55cbe498e7d5 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hb86f691850cc3c26
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/alloc/src/boxed.rs:1990:9
[INFO] [stdout]   11:     0x55cbe498e7d5 - test::test_main::{{closure}}::h903d8079e3c94d93
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/test/src/lib.rs:135:21
[INFO] [stdout]   12:     0x55cbe4af69f3 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h7c356b28a03897d7
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/alloc/src/boxed.rs:1990:9
[INFO] [stdout]   13:     0x55cbe4af69f3 - std::panicking::rust_panic_with_hook::h541791bcc774ef34
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/panicking.rs:839:13
[INFO] [stdout]   14:     0x55cbe4af66ca - std::panicking::begin_panic_handler::{{closure}}::h6479a2f0137c7d19
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/panicking.rs:704:13
[INFO] [stdout]   15:     0x55cbe4af5069 - std::sys::backtrace::__rust_end_short_backtrace::ha04e7c0fc61ded91
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/sys/backtrace.rs:168:18
[INFO] [stdout]   16:     0x55cbe4af635d - rust_begin_unwind
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/panicking.rs:695:5
[INFO] [stdout]   17:     0x55cbe4945410 - core::panicking::panic_fmt::h5764ee7030b7a73d
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/core/src/panicking.rs:75:14
[INFO] [stdout]   18:     0x55cbe49458b6 - core::result::unwrap_failed::h3ff7104a9ace307a
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/core/src/result.rs:1704:5
[INFO] [stdout]   19:     0x55cbe494b36a - core::result::Result<T,E>::unwrap::hd83de9f49f9ba690
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/core/src/result.rs:1109:23
[INFO] [stdout]   20:     0x55cbe494b36a - rustlings::exercise::test::test_clean::h592adcc57e75abbc
[INFO] [stdout]                                at /opt/rustwide/workdir/src/exercise.rs:269:9
[INFO] [stdout]   21:     0x55cbe494b2a7 - rustlings::exercise::test::test_clean::{{closure}}::h4f61050b95f5124e
[INFO] [stdout]                                at /opt/rustwide/workdir/src/exercise.rs:268:20
[INFO] [stdout]   22:     0x55cbe494d006 - core::ops::function::FnOnce::call_once::h2ff3978f2310ebca
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   23:     0x55cbe4993f5b - core::ops::function::FnOnce::call_once::h1dfa20b1ec1f6e08
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   24:     0x55cbe4993f5b - test::__rust_begin_short_backtrace::h7b10906492afc420
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/test/src/lib.rs:637:18
[INFO] [stdout]   25:     0x55cbe4992e48 - test::run_test_in_process::{{closure}}::h51c1c0d319f72c0a
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/test/src/lib.rs:660:60
[INFO] [stdout]   26:     0x55cbe4992e48 - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h5fadb750f3dbe714
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/core/src/panic/unwind_safe.rs:272:9
[INFO] [stdout]   27:     0x55cbe4992e48 - std::panicking::try::do_call::h1ca5071cef82bb40
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/panicking.rs:587:40
[INFO] [stdout]   28:     0x55cbe4992e48 - std::panicking::try::h6931de76fb9a61b1
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/panicking.rs:550:19
[INFO] [stdout]   29:     0x55cbe4992e48 - std::panic::catch_unwind::h67fc9dccf413f4e5
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/panic.rs:358:14
[INFO] [stdout]   30:     0x55cbe4992e48 - test::run_test_in_process::ha966dfbb1d048be5
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/test/src/lib.rs:660:27
[INFO] [stdout]   31:     0x55cbe4992e48 - test::run_test::{{closure}}::he209928ac5e8a3b8
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/test/src/lib.rs:581:43
[INFO] [stdout]   32:     0x55cbe4956dd5 - test::run_test::{{closure}}::h34c6289e0b5ed5a5
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/test/src/lib.rs:611:41
[INFO] [stdout]   33:     0x55cbe4956dd5 - std::sys::backtrace::__rust_begin_short_backtrace::h365aabf21799e6fc
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/sys/backtrace.rs:152:18
[INFO] [stdout]   34:     0x55cbe495a84a - std::thread::Builder::spawn_unchecked_::{{closure}}::{{closure}}::h3d5e582cba74b1c3
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/thread/mod.rs:559:17
[INFO] [stdout]   35:     0x55cbe495a84a - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h1214c75c3f73f94f
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/core/src/panic/unwind_safe.rs:272:9
[INFO] [stdout]   36:     0x55cbe495a84a - std::panicking::try::do_call::h73540336a45c0cec
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/panicking.rs:587:40
[INFO] [stdout]   37:     0x55cbe495a84a - std::panicking::try::h428956564307af63
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/panicking.rs:550:19
[INFO] [stdout]   38:     0x55cbe495a84a - std::panic::catch_unwind::h1a53a6ea2f2041e3
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/panic.rs:358:14
[INFO] [stdout]   39:     0x55cbe495a84a - std::thread::Builder::spawn_unchecked_::{{closure}}::hac66cbb88d807e14
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/thread/mod.rs:557:30
[INFO] [stdout]   40:     0x55cbe495a84a - core::ops::function::FnOnce::call_once{{vtable.shim}}::had7e2d02878d3212
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   41:     0x55cbe4afa96b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h292d1663b0785fda
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/alloc/src/boxed.rs:1976:9
[INFO] [stdout]   42:     0x55cbe4afa96b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h9d4af7b531852d72
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/alloc/src/boxed.rs:1976:9
[INFO] [stdout]   43:     0x55cbe4afa96b - std::sys::pal::unix::thread::Thread::new::thread_start::hcc5ed016d554f327
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/sys/pal/unix/thread.rs:106:17
[INFO] [stdout]   44:     0x777c13cceaa4 - <unknown>
[INFO] [stdout]   45:     0x777c13d5ba34 - clone
[INFO] [stdout]   46:                0x0 - <unknown>
[INFO] [stdout] 
[INFO] [stdout] ---- exercise::test::test_exercise_with_output stdout ----
[INFO] [stdout] 
[INFO] [stdout] thread 'exercise::test::test_exercise_with_output' panicked at src/exercise.rs:342:38:
[INFO] [stdout] called `Result::unwrap()` on an `Err` value: ExerciseOutput { stdout: "", stderr: "\u{1b}[0m\u{1b}[1m\u{1b}[38;5;9merror\u{1b}[0m\u{1b}[0m\u{1b}[1m: couldn't create a temp dir: Read-only file system (os error 30) at path \"/opt/rustwide/workdir/./rmetaVhcCfM\"\u{1b}[0m\n\n\u{1b}[0m\u{1b}[1m\u{1b}[38;5;9merror\u{1b}[0m\u{1b}[0m\u{1b}[1m: aborting due to 1 previous error\u{1b}[0m\n\n" }
[INFO] [stdout] stack backtrace:
[INFO] [stdout]    0:     0x55cbe4af4b50 - std::backtrace_rs::backtrace::libunwind::trace::h2b8934d68a0c74cb
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/../../backtrace/src/backtrace/libunwind.rs:117:9
[INFO] [stdout]    1:     0x55cbe4af4b50 - std::backtrace_rs::backtrace::trace_unsynchronized::h72d137991fa6eab8
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/../../backtrace/src/backtrace/mod.rs:66:14
[INFO] [stdout]    2:     0x55cbe4af4b50 - std::sys::backtrace::_print_fmt::h3e831e32e6da920b
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/sys/backtrace.rs:66:9
[INFO] [stdout]    3:     0x55cbe4af4b50 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h6d42cc84fc840290
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/sys/backtrace.rs:39:26
[INFO] [stdout]    4:     0x55cbe4b1b4d3 - core::fmt::rt::Argument::fmt::h7239af9e2199f2a8
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/core/src/fmt/rt.rs:177:76
[INFO] [stdout]    5:     0x55cbe4b1b4d3 - core::fmt::write::h5af61a909e3ec64d
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/core/src/fmt/mod.rs:1449:21
[INFO] [stdout]    6:     0x55cbe4af1c63 - std::io::Write::write_fmt::h64baa9197d9a3b04
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/io/mod.rs:1890:15
[INFO] [stdout]    7:     0x55cbe4af49a2 - std::sys::backtrace::BacktraceLock::print::h555579e7396c26ac
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/sys/backtrace.rs:42:9
[INFO] [stdout]    8:     0x55cbe4af5f7f - std::panicking::default_hook::{{closure}}::h9128866118196224
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/panicking.rs:298:22
[INFO] [stdout]    9:     0x55cbe4af5d98 - std::panicking::default_hook::h52e9e7314e0255f6
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/panicking.rs:322:9
[INFO] [stdout]   10:     0x55cbe498e7d5 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hb86f691850cc3c26
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/alloc/src/boxed.rs:1990:9
[INFO] [stdout]   11:     0x55cbe498e7d5 - test::test_main::{{closure}}::h903d8079e3c94d93
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/test/src/lib.rs:135:21
[INFO] [stdout]   12:     0x55cbe4af69f3 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h7c356b28a03897d7
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/alloc/src/boxed.rs:1990:9
[INFO] [stdout]   13:     0x55cbe4af69f3 - std::panicking::rust_panic_with_hook::h541791bcc774ef34
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/panicking.rs:839:13
[INFO] [stdout]   14:     0x55cbe4af66ca - std::panicking::begin_panic_handler::{{closure}}::h6479a2f0137c7d19
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/panicking.rs:704:13
[INFO] [stdout]   15:     0x55cbe4af5069 - std::sys::backtrace::__rust_end_short_backtrace::ha04e7c0fc61ded91
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/sys/backtrace.rs:168:18
[INFO] [stdout]   16:     0x55cbe4af635d - rust_begin_unwind
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/panicking.rs:695:5
[INFO] [stdout]   17:     0x55cbe4945410 - core::panicking::panic_fmt::h5764ee7030b7a73d
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/core/src/panicking.rs:75:14
[INFO] [stdout]   18:     0x55cbe49458b6 - core::result::unwrap_failed::h3ff7104a9ace307a
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/core/src/result.rs:1704:5
[INFO] [stdout]   19:     0x55cbe494c20a - core::result::Result<T,E>::unwrap::h6a5df34c09893f35
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/core/src/result.rs:1109:23
[INFO] [stdout]   20:     0x55cbe494c20a - rustlings::exercise::test::test_exercise_with_output::hea2e68a341f3a269
[INFO] [stdout]                                at /opt/rustwide/workdir/src/exercise.rs:342:19
[INFO] [stdout]   21:     0x55cbe494c017 - rustlings::exercise::test::test_exercise_with_output::{{closure}}::h865f1e88492078d9
[INFO] [stdout]                                at /opt/rustwide/workdir/src/exercise.rs:335:35
[INFO] [stdout]   22:     0x55cbe494d0d6 - core::ops::function::FnOnce::call_once::hffe24360b9552360
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   23:     0x55cbe4993f5b - core::ops::function::FnOnce::call_once::h1dfa20b1ec1f6e08
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   24:     0x55cbe4993f5b - test::__rust_begin_short_backtrace::h7b10906492afc420
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/test/src/lib.rs:637:18
[INFO] [stdout]   25:     0x55cbe4992e48 - test::run_test_in_process::{{closure}}::h51c1c0d319f72c0a
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/test/src/lib.rs:660:60
[INFO] [stdout]   26:     0x55cbe4992e48 - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h5fadb750f3dbe714
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/core/src/panic/unwind_safe.rs:272:9
[INFO] [stdout]   27:     0x55cbe4992e48 - std::panicking::try::do_call::h1ca5071cef82bb40
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/panicking.rs:587:40
[INFO] [stdout]   28:     0x55cbe4992e48 - std::panicking::try::h6931de76fb9a61b1
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/panicking.rs:550:19
[INFO] [stdout]   29:     0x55cbe4992e48 - std::panic::catch_unwind::h67fc9dccf413f4e5
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/panic.rs:358:14
[INFO] [stdout]   30:     0x55cbe4992e48 - test::run_test_in_process::ha966dfbb1d048be5
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/test/src/lib.rs:660:27
[INFO] [stdout]   31:     0x55cbe4992e48 - test::run_test::{{closure}}::he209928ac5e8a3b8
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/test/src/lib.rs:581:43
[INFO] [stdout]   32:     0x55cbe4956dd5 - test::run_test::{{closure}}::h34c6289e0b5ed5a5
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/test/src/lib.rs:611:41
[INFO] [stdout]   33:     0x55cbe4956dd5 - std::sys::backtrace::__rust_begin_short_backtrace::h365aabf21799e6fc
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/sys/backtrace.rs:152:18
[INFO] [stdout]   34:     0x55cbe495a84a - std::thread::Builder::spawn_unchecked_::{{closure}}::{{closure}}::h3d5e582cba74b1c3
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/thread/mod.rs:559:17
[INFO] [stdout]   35:     0x55cbe495a84a - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h1214c75c3f73f94f
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/core/src/panic/unwind_safe.rs:272:9
[INFO] [stdout]   36:     0x55cbe495a84a - std::panicking::try::do_call::h73540336a45c0cec
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/panicking.rs:587:40
[INFO] [stdout]   37:     0x55cbe495a84a - std::panicking::try::h428956564307af63
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/panicking.rs:550:19
[INFO] [stdout]   38:     0x55cbe495a84a - std::panic::catch_unwind::h1a53a6ea2f2041e3
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/panic.rs:358:14
[INFO] [stdout]   39:     0x55cbe495a84a - std::thread::Builder::spawn_unchecked_::{{closure}}::hac66cbb88d807e14
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/thread/mod.rs:557:30
[INFO] [stdout]   40:     0x55cbe495a84a - core::ops::function::FnOnce::call_once{{vtable.shim}}::had7e2d02878d3212
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   41:     0x55cbe4afa96b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h292d1663b0785fda
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/alloc/src/boxed.rs:1976:9
[INFO] [stdout]   42:     0x55cbe4afa96b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h9d4af7b531852d72
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/alloc/src/boxed.rs:1976:9
[INFO] [stdout]   43:     0x55cbe4afa96b - std::sys::pal::unix::thread::Thread::new::thread_start::hcc5ed016d554f327
[INFO] [stdout]                                at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/sys/pal/unix/thread.rs:106:17
[INFO] [stdout]   44:     0x777c13cceaa4 - <unknown>
[INFO] [stdout]   45:     0x777c13d5ba34 - clone
[INFO] [stdout]   46:                0x0 - <unknown>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     exercise::test::test_clean
[INFO] [stdout]     exercise::test::test_exercise_with_output
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 2 passed; 2 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.19s
[INFO] [stdout] 
[INFO] [stderr] error: test failed, to rerun pass `--bin rustlings`
[INFO] running `Command { std: "docker" "inspect" "ec8a8933a53044f13c29882c84d451c98cbe7942a7b8e22f2de306bf70ee6340", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ec8a8933a53044f13c29882c84d451c98cbe7942a7b8e22f2de306bf70ee6340", kill_on_drop: false }`
[INFO] [stdout] ec8a8933a53044f13c29882c84d451c98cbe7942a7b8e22f2de306bf70ee6340