[INFO] updating cached repository https://github.com/vibhoothiiaanand/rustlings [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune", kill_on_drop: false }` [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 3841e974d8f178c959015990f8dc00acffe40611 [INFO] testing vibhoothiiaanand/rustlings against beta-2020-07-24 for beta-1.46-1 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvibhoothiiaanand%2Frustlings" "/workspace/builds/worker-9/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/vibhoothiiaanand/rustlings on toolchain beta-2020-07-24 [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/vibhoothiiaanand/rustlings [INFO] finished tweaking git repo https://github.com/vibhoothiiaanand/rustlings [INFO] tweaked toml for git repo https://github.com/vibhoothiiaanand/rustlings written to /workspace/builds/worker-9/source/Cargo.toml [INFO] crate git repo https://github.com/vibhoothiiaanand/rustlings already has a lockfile, it will not be regenerated [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] error: the lock file /workspace/builds/worker-9/source/Cargo.lock needs to be updated but --locked was passed to prevent this [INFO] [stderr] If you want to try to generate the lock file without accessing the network, use the --offline flag. [INFO] the lockfile is outdated, regenerating it [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }` [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 2dfbb4f8ebea61dc4be1b8d109c2779018b5f6f4609383b5a21c84eb82450ee8 [INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] running `Command { std: "docker" "start" "-a" "2dfbb4f8ebea61dc4be1b8d109c2779018b5f6f4609383b5a21c84eb82450ee8", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "2dfbb4f8ebea61dc4be1b8d109c2779018b5f6f4609383b5a21c84eb82450ee8", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "2dfbb4f8ebea61dc4be1b8d109c2779018b5f6f4609383b5a21c84eb82450ee8", kill_on_drop: false }` [INFO] [stdout] 2dfbb4f8ebea61dc4be1b8d109c2779018b5f6f4609383b5a21c84eb82450ee8 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] aaf0178334095bfae267c2875ae949a845cd86f4b31ec4acd5363e051543c4b4 [INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] running `Command { std: "docker" "start" "-a" "aaf0178334095bfae267c2875ae949a845cd86f4b31ec4acd5363e051543c4b4", kill_on_drop: false }` [INFO] [stderr] Compiling syn v1.0.38 [INFO] [stderr] Compiling log v0.4.11 [INFO] [stderr] Compiling termios v0.3.2 [INFO] [stderr] Compiling terminal_size v0.1.13 [INFO] [stderr] Compiling inotify-sys v0.1.3 [INFO] [stderr] Compiling clicolors-control v1.0.1 [INFO] [stderr] Compiling filetime v0.2.12 [INFO] [stderr] Compiling clap v2.33.2 [INFO] [stderr] Compiling number_prefix v0.2.8 [INFO] [stderr] Compiling inotify v0.7.1 [INFO] [stderr] Compiling console v0.12.0 [INFO] [stderr] Compiling console v0.7.7 [INFO] [stderr] Compiling mio v0.6.22 [INFO] [stderr] Compiling indicatif v0.10.3 [INFO] [stderr] Compiling mio-extras v2.0.6 [INFO] [stderr] Compiling notify v4.0.15 [INFO] [stderr] Compiling serde_derive v1.0.114 [INFO] [stderr] Compiling serde v1.0.114 [INFO] [stderr] Compiling toml v0.4.10 [INFO] [stderr] Compiling rustlings v2.2.1 (/opt/rustwide/workdir) [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 55.92s [INFO] running `Command { std: "docker" "inspect" "aaf0178334095bfae267c2875ae949a845cd86f4b31ec4acd5363e051543c4b4", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "aaf0178334095bfae267c2875ae949a845cd86f4b31ec4acd5363e051543c4b4", kill_on_drop: false }` [INFO] [stdout] aaf0178334095bfae267c2875ae949a845cd86f4b31ec4acd5363e051543c4b4 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }` [INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] [stdout] 75a67a7f9577edfe91ff71908fb5524fc7c4e9f1c7ee5e87f8eb5c8b53bd8744 [INFO] running `Command { std: "docker" "start" "-a" "75a67a7f9577edfe91ff71908fb5524fc7c4e9f1c7ee5e87f8eb5c8b53bd8744", kill_on_drop: false }` [INFO] [stderr] Compiling predicates-core v1.0.0 [INFO] [stderr] Compiling itoa v0.4.6 [INFO] [stderr] Compiling escargot v0.4.0 [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 float-cmp v0.8.0 [INFO] [stderr] Compiling predicates v1.0.5 [INFO] [stderr] Compiling predicates-tree v1.0.0 [INFO] [stderr] Compiling serde_json v1.0.57 [INFO] [stderr] Compiling assert_cmd v0.11.1 [INFO] [stderr] Compiling rustlings v2.2.1 (/opt/rustwide/workdir) [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 17.87s [INFO] running `Command { std: "docker" "inspect" "75a67a7f9577edfe91ff71908fb5524fc7c4e9f1c7ee5e87f8eb5c8b53bd8744", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "75a67a7f9577edfe91ff71908fb5524fc7c4e9f1c7ee5e87f8eb5c8b53bd8744", kill_on_drop: false }` [INFO] [stdout] 75a67a7f9577edfe91ff71908fb5524fc7c4e9f1c7ee5e87f8eb5c8b53bd8744 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "test" "--frozen", kill_on_drop: false }` [INFO] [stdout] 536585d877c9767737899ea3739b0ed0b2073cb46aa85bab25b54550f8ffc99f [INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] running `Command { std: "docker" "start" "-a" "536585d877c9767737899ea3739b0ed0b2073cb46aa85bab25b54550f8ffc99f", kill_on_drop: false }` [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 0.29s [INFO] [stderr] Running /opt/rustwide/target/debug/deps/rustlings-07257b68546c0b2c [INFO] [stdout] [INFO] [stdout] running 3 tests [INFO] [stdout] test exercise::test::test_pending_state ... ok [INFO] [stdout] test exercise::test::test_finished_exercise ... ok [INFO] [stdout] test exercise::test::test_clean ... FAILED [INFO] [stdout] [INFO] [stdout] failures: [INFO] [stdout] [INFO] [stdout] ---- exercise::test::test_clean stdout ---- [INFO] [stdout] thread 'exercise::test::test_clean' panicked at 'called `Result::unwrap()` on an `Err` value: Os { code: 30, kind: Other, message: "Read-only file system" }', src/exercise.rs:210:36 [INFO] [stdout] stack backtrace: [INFO] [stdout] 0: 0x55582abc58d5 - backtrace::backtrace::libunwind::trace::h5e2646fa3eddf2ea [INFO] [stdout] at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.46/src/backtrace/libunwind.rs:86 [INFO] [stdout] 1: 0x55582abc58d5 - backtrace::backtrace::trace_unsynchronized::hb95dd7f77ce47877 [INFO] [stdout] at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.46/src/backtrace/mod.rs:66 [INFO] [stdout] 2: 0x55582abc58d5 - std::sys_common::backtrace::_print_fmt::h5e71b67af43fd70d [INFO] [stdout] at src/libstd/sys_common/backtrace.rs:78 [INFO] [stdout] 3: 0x55582abc58d5 - ::fmt::hdb4a83d2b61107e5 [INFO] [stdout] at src/libstd/sys_common/backtrace.rs:59 [INFO] [stdout] 4: 0x55582abedd5c - core::fmt::write::ha20e7262fa3e8a7a [INFO] [stdout] at src/libcore/fmt/mod.rs:1076 [INFO] [stdout] 5: 0x55582a9c6c55 - std::io::Write::write_fmt::hd8ff364c7845d2d0 [INFO] [stdout] at /rustc/6f959902b3103c49ca981fbc01871589c3498489/src/libstd/io/mod.rs:1537 [INFO] [stdout] 6: 0x55582abbfc61 - std::io::impls::>::write_fmt::h1c057ef6e8762996 [INFO] [stdout] at src/libstd/io/impls.rs:176 [INFO] [stdout] 7: 0x55582abc8030 - std::sys_common::backtrace::_print::h9c07314cc66ba539 [INFO] [stdout] at src/libstd/sys_common/backtrace.rs:62 [INFO] [stdout] 8: 0x55582abc8030 - std::sys_common::backtrace::print::hd1fd65f49a2d8544 [INFO] [stdout] at src/libstd/sys_common/backtrace.rs:49 [INFO] [stdout] 9: 0x55582abc8030 - std::panicking::default_hook::{{closure}}::h222da46485ab36fc [INFO] [stdout] at src/libstd/panicking.rs:198 [INFO] [stdout] 10: 0x55582abc7d2a - std::panicking::default_hook::hc5868949d129ed00 [INFO] [stdout] at src/libstd/panicking.rs:214 [INFO] [stdout] 11: 0x55582abc8673 - std::panicking::rust_panic_with_hook::h26a6ab8b0993c0c8 [INFO] [stdout] at src/libstd/panicking.rs:526 [INFO] [stdout] 12: 0x55582abc826b - rust_begin_unwind [INFO] [stdout] at src/libstd/panicking.rs:437 [INFO] [stdout] 13: 0x55582abec6f1 - core::panicking::panic_fmt::h17139c2000299725 [INFO] [stdout] at src/libcore/panicking.rs:85 [INFO] [stdout] 14: 0x55582abec513 - core::option::expect_none_failed::h972f96abb4ec8952 [INFO] [stdout] at src/libcore/option.rs:1269 [INFO] [stdout] 15: 0x55582a9bff3b - core::result::Result::unwrap::h683e2d0f5eaf1642 [INFO] [stdout] at /rustc/6f959902b3103c49ca981fbc01871589c3498489/src/libcore/result.rs:1005 [INFO] [stdout] 16: 0x55582a9be5c4 - rustlings::exercise::test::test_clean::h8b917b8b8ddac779 [INFO] [stdout] at src/exercise.rs:210 [INFO] [stdout] 17: 0x55582a9be56a - rustlings::exercise::test::test_clean::{{closure}}::h1a70a473f0808e11 [INFO] [stdout] at src/exercise.rs:209 [INFO] [stdout] 18: 0x55582a9b5a8e - core::ops::function::FnOnce::call_once::h89ccc1c51773b8a2 [INFO] [stdout] at /rustc/6f959902b3103c49ca981fbc01871589c3498489/src/libcore/ops/function.rs:233 [INFO] [stdout] 19: 0x55582a9ee1cc - as core::ops::function::FnOnce>::call_once::h42148c33ed88c979 [INFO] [stdout] at /rustc/6f959902b3103c49ca981fbc01871589c3498489/src/liballoc/boxed.rs:1081 [INFO] [stdout] 20: 0x55582a9ee1cc - as core::ops::function::FnOnce<()>>::call_once::h759dc0b09d774665 [INFO] [stdout] at /rustc/6f959902b3103c49ca981fbc01871589c3498489/src/libstd/panic.rs:318 [INFO] [stdout] 21: 0x55582a9ee1cc - std::panicking::try::do_call::h676ad1fc9e9badea [INFO] [stdout] at /rustc/6f959902b3103c49ca981fbc01871589c3498489/src/libstd/panicking.rs:348 [INFO] [stdout] 22: 0x55582a9ee1cc - std::panicking::try::hee36a8727a3050b0 [INFO] [stdout] at /rustc/6f959902b3103c49ca981fbc01871589c3498489/src/libstd/panicking.rs:325 [INFO] [stdout] 23: 0x55582a9ee1cc - std::panic::catch_unwind::hd5d426ebd89b2542 [INFO] [stdout] at /rustc/6f959902b3103c49ca981fbc01871589c3498489/src/libstd/panic.rs:394 [INFO] [stdout] 24: 0x55582a9ee1cc - test::run_test_in_process::h8dacdba4dc4cbaa5 [INFO] [stdout] at src/libtest/lib.rs:541 [INFO] [stdout] 25: 0x55582a9ee1cc - test::run_test::run_test_inner::{{closure}}::hf93754afad6be40f [INFO] [stdout] at src/libtest/lib.rs:450 [INFO] [stdout] 26: 0x55582a9c6146 - std::sys_common::backtrace::__rust_begin_short_backtrace::h2c69fab544a90730 [INFO] [stdout] at /rustc/6f959902b3103c49ca981fbc01871589c3498489/src/libstd/sys_common/backtrace.rs:130 [INFO] [stdout] 27: 0x55582a9cb1d5 - std::thread::Builder::spawn_unchecked::{{closure}}::{{closure}}::hcf302fafa60d80f2 [INFO] [stdout] at /rustc/6f959902b3103c49ca981fbc01871589c3498489/src/libstd/thread/mod.rs:475 [INFO] [stdout] 28: 0x55582a9cb1d5 - as core::ops::function::FnOnce<()>>::call_once::h39ede710608e817e [INFO] [stdout] at /rustc/6f959902b3103c49ca981fbc01871589c3498489/src/libstd/panic.rs:318 [INFO] [stdout] 29: 0x55582a9cb1d5 - std::panicking::try::do_call::hec0b4d2faa46fbf7 [INFO] [stdout] at /rustc/6f959902b3103c49ca981fbc01871589c3498489/src/libstd/panicking.rs:348 [INFO] [stdout] 30: 0x55582a9cb1d5 - std::panicking::try::h0144ba3f2539803d [INFO] [stdout] at /rustc/6f959902b3103c49ca981fbc01871589c3498489/src/libstd/panicking.rs:325 [INFO] [stdout] 31: 0x55582a9cb1d5 - std::panic::catch_unwind::ha03e59eb589f857b [INFO] [stdout] at /rustc/6f959902b3103c49ca981fbc01871589c3498489/src/libstd/panic.rs:394 [INFO] [stdout] 32: 0x55582a9cb1d5 - std::thread::Builder::spawn_unchecked::{{closure}}::hdeba34620a4a7a44 [INFO] [stdout] at /rustc/6f959902b3103c49ca981fbc01871589c3498489/src/libstd/thread/mod.rs:474 [INFO] [stdout] 33: 0x55582a9cb1d5 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h552693dbb801eadd [INFO] [stdout] at /rustc/6f959902b3103c49ca981fbc01871589c3498489/src/libcore/ops/function.rs:233 [INFO] [stdout] 34: 0x55582abcea0a - as core::ops::function::FnOnce>::call_once::h61c24496ae624ac5 [INFO] [stdout] at /rustc/6f959902b3103c49ca981fbc01871589c3498489/src/liballoc/boxed.rs:1081 [INFO] [stdout] 35: 0x55582abcea0a - as core::ops::function::FnOnce>::call_once::h89548957afa14049 [INFO] [stdout] at /rustc/6f959902b3103c49ca981fbc01871589c3498489/src/liballoc/boxed.rs:1081 [INFO] [stdout] 36: 0x55582abcea0a - std::sys::unix::thread::Thread::new::thread_start::h73903fbbff5b990e [INFO] [stdout] at src/libstd/sys/unix/thread.rs:87 [INFO] [stdout] 37: 0x7f2a0a8e7609 - start_thread [INFO] [stdout] 38: 0x7f2a0aa29103 - __clone [INFO] [stdout] 39: 0x0 - [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] failures: [INFO] [stdout] exercise::test::test_clean [INFO] [stdout] [INFO] [stdout] test result: FAILED. 2 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out [INFO] [stdout] [INFO] [stderr] error: test failed, to rerun pass '--bin rustlings' [INFO] running `Command { std: "docker" "inspect" "536585d877c9767737899ea3739b0ed0b2073cb46aa85bab25b54550f8ffc99f", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "536585d877c9767737899ea3739b0ed0b2073cb46aa85bab25b54550f8ffc99f", kill_on_drop: false }` [INFO] [stdout] 536585d877c9767737899ea3739b0ed0b2073cb46aa85bab25b54550f8ffc99f