[INFO] updating cached repository https://github.com/matklad/group-by-challenge [INFO] running `"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"` [INFO] running `"git" "rev-parse" "HEAD"` [INFO] [stdout] 297c95d461427a61f621767443897c37bef43f0f [INFO] testing matklad/group-by-challenge against master#28742a1146f10a4f09369baad027a464acb7a766 for pr-71274 [INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmatklad%2Fgroup-by-challenge" "/workspace/builds/worker-3/source"` [INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/matklad/group-by-challenge on toolchain 28742a1146f10a4f09369baad027a464acb7a766 [INFO] running `"/workspace/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "read-manifest" "--manifest-path" "Cargo.toml"` [INFO] started tweaking git repo https://github.com/matklad/group-by-challenge [INFO] finished tweaking git repo https://github.com/matklad/group-by-challenge [INFO] tweaked toml for git repo https://github.com/matklad/group-by-challenge written to /workspace/builds/worker-3/source/Cargo.toml [INFO] crate git repo https://github.com/matklad/group-by-challenge already has a lockfile, it will not be regenerated [INFO] running `"/workspace/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "fetch" "--locked" "--manifest-path" "Cargo.toml"` [INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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=forbid" "-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" "/opt/rustwide/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "build" "--frozen"` [INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] [stdout] 100ff4edb37e0aa69dc96c6eefff287ae47c58c0f1ae8bc8ea72682a30333afe [INFO] running `"docker" "start" "-a" "100ff4edb37e0aa69dc96c6eefff287ae47c58c0f1ae8bc8ea72682a30333afe"` [INFO] [stderr] Compiling group-by-challenge v0.1.0 (/opt/rustwide/workdir) [INFO] [stderr] warning: unused variable: `xs` [INFO] [stderr] --> src/lib.rs:1:29 [INFO] [stderr] | [INFO] [stderr] 1 | pub fn group_by(xs: I, key_fn: F) -> Vec<(K, Vec)> [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_xs` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `key_fn` [INFO] [stderr] --> src/lib.rs:1:36 [INFO] [stderr] | [INFO] [stderr] 1 | pub fn group_by(xs: I, key_fn: F) -> Vec<(K, Vec)> [INFO] [stderr] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_key_fn` [INFO] [stderr] [INFO] [stderr] warning: 2 warnings emitted [INFO] [stderr] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 0.36s [INFO] running `"docker" "inspect" "100ff4edb37e0aa69dc96c6eefff287ae47c58c0f1ae8bc8ea72682a30333afe"` [INFO] running `"docker" "rm" "-f" "100ff4edb37e0aa69dc96c6eefff287ae47c58c0f1ae8bc8ea72682a30333afe"` [INFO] [stdout] 100ff4edb37e0aa69dc96c6eefff287ae47c58c0f1ae8bc8ea72682a30333afe [INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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=forbid" "-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" "/opt/rustwide/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "test" "--frozen" "--no-run"` [INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] [stdout] a40e3cfb3c98cffa0b9b814e1853d35c81026d07d35e34cb99cf57bd7043c604 [INFO] running `"docker" "start" "-a" "a40e3cfb3c98cffa0b9b814e1853d35c81026d07d35e34cb99cf57bd7043c604"` [INFO] [stderr] Compiling group-by-challenge v0.1.0 (/opt/rustwide/workdir) [INFO] [stderr] warning: unused variable: `xs` [INFO] [stderr] --> src/lib.rs:1:29 [INFO] [stderr] | [INFO] [stderr] 1 | pub fn group_by(xs: I, key_fn: F) -> Vec<(K, Vec)> [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_xs` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `key_fn` [INFO] [stderr] --> src/lib.rs:1:36 [INFO] [stderr] | [INFO] [stderr] 1 | pub fn group_by(xs: I, key_fn: F) -> Vec<(K, Vec)> [INFO] [stderr] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_key_fn` [INFO] [stderr] [INFO] [stderr] warning: 2 warnings emitted [INFO] [stderr] [INFO] [stderr] warning: unused variable: `xs` [INFO] [stderr] --> src/lib.rs:1:29 [INFO] [stderr] | [INFO] [stderr] 1 | pub fn group_by(xs: I, key_fn: F) -> Vec<(K, Vec)> [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_xs` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `key_fn` [INFO] [stderr] --> src/lib.rs:1:36 [INFO] [stderr] | [INFO] [stderr] 1 | pub fn group_by(xs: I, key_fn: F) -> Vec<(K, Vec)> [INFO] [stderr] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_key_fn` [INFO] [stderr] [INFO] [stderr] warning: 2 warnings emitted [INFO] [stderr] [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 0.97s [INFO] running `"docker" "inspect" "a40e3cfb3c98cffa0b9b814e1853d35c81026d07d35e34cb99cf57bd7043c604"` [INFO] running `"docker" "rm" "-f" "a40e3cfb3c98cffa0b9b814e1853d35c81026d07d35e34cb99cf57bd7043c604"` [INFO] [stdout] a40e3cfb3c98cffa0b9b814e1853d35c81026d07d35e34cb99cf57bd7043c604 [INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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=forbid" "-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" "/opt/rustwide/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "test" "--frozen"` [INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] [stdout] 079cfe6608915070f9bc3e90a46b77fead70dd77277e7a107d7c1e54d5f9b759 [INFO] running `"docker" "start" "-a" "079cfe6608915070f9bc3e90a46b77fead70dd77277e7a107d7c1e54d5f9b759"` [INFO] [stderr] warning: unused variable: `xs` [INFO] [stderr] --> src/lib.rs:1:29 [INFO] [stderr] | [INFO] [stderr] 1 | pub fn group_by(xs: I, key_fn: F) -> Vec<(K, Vec)> [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_xs` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `key_fn` [INFO] [stderr] --> src/lib.rs:1:36 [INFO] [stderr] | [INFO] [stderr] 1 | pub fn group_by(xs: I, key_fn: F) -> Vec<(K, Vec)> [INFO] [stderr] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_key_fn` [INFO] [stderr] [INFO] [stderr] warning: 2 warnings emitted [INFO] [stderr] [INFO] [stderr] warning: unused variable: `xs` [INFO] [stderr] --> src/lib.rs:1:29 [INFO] [stderr] | [INFO] [stderr] 1 | pub fn group_by(xs: I, key_fn: F) -> Vec<(K, Vec)> [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_xs` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `key_fn` [INFO] [stderr] --> src/lib.rs:1:36 [INFO] [stderr] | [INFO] [stderr] 1 | pub fn group_by(xs: I, key_fn: F) -> Vec<(K, Vec)> [INFO] [stderr] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_key_fn` [INFO] [stderr] [INFO] [stderr] warning: 2 warnings emitted [INFO] [stderr] [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 0.07s [INFO] [stderr] Running /opt/rustwide/target/debug/deps/group_by_challenge-05989d6b5ed49387 [INFO] [stdout] [INFO] [stdout] running 1 test [INFO] [stdout] test tests ... FAILED [INFO] [stdout] [INFO] [stdout] failures: [INFO] [stdout] [INFO] [stdout] ---- tests stdout ---- [INFO] [stdout] thread 'tests' panicked at 'not yet implemented: make the tests pass', src/lib.rs:7:5 [INFO] [stdout] stack backtrace: [INFO] [stdout] 0: 0x5635fe972fb4 - backtrace::backtrace::libunwind::trace::hbb4ce8c04526962e [INFO] [stdout] at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.46/src/backtrace/libunwind.rs:86 [INFO] [stdout] 1: 0x5635fe972fb4 - backtrace::backtrace::trace_unsynchronized::h79251c088e7be038 [INFO] [stdout] at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.46/src/backtrace/mod.rs:66 [INFO] [stdout] 2: 0x5635fe972fb4 - std::sys_common::backtrace::_print_fmt::h6b0ea30a9223acae [INFO] [stdout] at src/libstd/sys_common/backtrace.rs:78 [INFO] [stdout] 3: 0x5635fe972fb4 - ::fmt::h4d51ef07ce58e54b [INFO] [stdout] at src/libstd/sys_common/backtrace.rs:59 [INFO] [stdout] 4: 0x5635fe99bbcc - core::fmt::write::he16b9c1345d8565e [INFO] [stdout] at src/libcore/fmt/mod.rs:1069 [INFO] [stdout] 5: 0x5635fe926c45 - std::io::Write::write_fmt::hc31efe493f037457 [INFO] [stdout] at /rustc/28742a1146f10a4f09369baad027a464acb7a766/src/libstd/io/mod.rs:1504 [INFO] [stdout] 6: 0x5635fe96d5d1 - std::io::impls::>::write_fmt::hfcb1ff6c5b834381 [INFO] [stdout] at src/libstd/io/impls.rs:156 [INFO] [stdout] 7: 0x5635fe975885 - std::sys_common::backtrace::_print::h9288fa7d9f6629cb [INFO] [stdout] at src/libstd/sys_common/backtrace.rs:62 [INFO] [stdout] 8: 0x5635fe975885 - std::sys_common::backtrace::print::h82e606e62781d8af [INFO] [stdout] at src/libstd/sys_common/backtrace.rs:49 [INFO] [stdout] 9: 0x5635fe975885 - std::panicking::default_hook::{{closure}}::h1fe350ecbf7604e4 [INFO] [stdout] at src/libstd/panicking.rs:198 [INFO] [stdout] 10: 0x5635fe97556b - std::panicking::default_hook::h1b8b42953fdc841d [INFO] [stdout] at src/libstd/panicking.rs:215 [INFO] [stdout] 11: 0x5635fe975ee2 - std::panicking::rust_panic_with_hook::he73826f4bb75a21e [INFO] [stdout] at src/libstd/panicking.rs:511 [INFO] [stdout] 12: 0x5635fe975acb - rust_begin_unwind [INFO] [stdout] at src/libstd/panicking.rs:419 [INFO] [stdout] 13: 0x5635fe975a3b - std::panicking::begin_panic_fmt::hf14ab99546f1bbc1 [INFO] [stdout] at src/libstd/panicking.rs:373 [INFO] [stdout] 14: 0x5635fe91d201 - group_by_challenge::group_by::hb43a94a680fdfc5d [INFO] [stdout] at src/lib.rs:7 [INFO] [stdout] 15: 0x5635fe91d378 - group_by_challenge::tests::h4a7ac83e864b3359 [INFO] [stdout] at src/lib.rs:13 [INFO] [stdout] 16: 0x5635fe91d32a - group_by_challenge::tests::{{closure}}::h2a5d60e6bb5e7de4 [INFO] [stdout] at src/lib.rs:11 [INFO] [stdout] 17: 0x5635fe91f83e - core::ops::function::FnOnce::call_once::h22eb856a6d077af3 [INFO] [stdout] at /rustc/28742a1146f10a4f09369baad027a464acb7a766/src/libcore/ops/function.rs:232 [INFO] [stdout] 18: 0x5635fe932b3f - as core::ops::function::FnOnce>::call_once::he1ba1da20629a2d8 [INFO] [stdout] at /rustc/28742a1146f10a4f09369baad027a464acb7a766/src/liballoc/boxed.rs:1008 [INFO] [stdout] 19: 0x5635fe94e13e - as core::ops::function::FnOnce<()>>::call_once::hf94927858761de4a [INFO] [stdout] at /rustc/28742a1146f10a4f09369baad027a464acb7a766/src/libstd/panic.rs:318 [INFO] [stdout] 20: 0x5635fe94e13e - std::panicking::try::do_call::h1585003392664d93 [INFO] [stdout] at /rustc/28742a1146f10a4f09369baad027a464acb7a766/src/libstd/panicking.rs:331 [INFO] [stdout] 21: 0x5635fe94e13e - std::panicking::try::h43d950f958a74468 [INFO] [stdout] at /rustc/28742a1146f10a4f09369baad027a464acb7a766/src/libstd/panicking.rs:274 [INFO] [stdout] 22: 0x5635fe94e13e - std::panic::catch_unwind::hb5284de2977ddeea [INFO] [stdout] at /rustc/28742a1146f10a4f09369baad027a464acb7a766/src/libstd/panic.rs:394 [INFO] [stdout] 23: 0x5635fe94e13e - test::run_test_in_process::had39bb305b26a3ae [INFO] [stdout] at src/libtest/lib.rs:541 [INFO] [stdout] 24: 0x5635fe94e13e - test::run_test::run_test_inner::{{closure}}::h12b1756b854ada1a [INFO] [stdout] at src/libtest/lib.rs:450 [INFO] [stdout] 25: 0x5635fe9260f6 - std::sys_common::backtrace::__rust_begin_short_backtrace::hec04b80bece92bf9 [INFO] [stdout] at /rustc/28742a1146f10a4f09369baad027a464acb7a766/src/libstd/sys_common/backtrace.rs:130 [INFO] [stdout] 26: 0x5635fe92b415 - std::thread::Builder::spawn_unchecked::{{closure}}::{{closure}}::heca431434c1ac418 [INFO] [stdout] at /rustc/28742a1146f10a4f09369baad027a464acb7a766/src/libstd/thread/mod.rs:475 [INFO] [stdout] 27: 0x5635fe92b415 - as core::ops::function::FnOnce<()>>::call_once::he2457d582c032747 [INFO] [stdout] at /rustc/28742a1146f10a4f09369baad027a464acb7a766/src/libstd/panic.rs:318 [INFO] [stdout] 28: 0x5635fe92b415 - std::panicking::try::do_call::hbcd49dc3823e8b28 [INFO] [stdout] at /rustc/28742a1146f10a4f09369baad027a464acb7a766/src/libstd/panicking.rs:331 [INFO] [stdout] 29: 0x5635fe92b415 - std::panicking::try::h1ba95c07dd8d422b [INFO] [stdout] at /rustc/28742a1146f10a4f09369baad027a464acb7a766/src/libstd/panicking.rs:274 [INFO] [stdout] 30: 0x5635fe92b415 - std::panic::catch_unwind::h95854794ba9eee4c [INFO] [stdout] at /rustc/28742a1146f10a4f09369baad027a464acb7a766/src/libstd/panic.rs:394 [INFO] [stdout] 31: 0x5635fe92b415 - std::thread::Builder::spawn_unchecked::{{closure}}::h4e297b8574092d6e [INFO] [stdout] at /rustc/28742a1146f10a4f09369baad027a464acb7a766/src/libstd/thread/mod.rs:474 [INFO] [stdout] 32: 0x5635fe92b415 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h1b855aad7f5ac67e [INFO] [stdout] at /rustc/28742a1146f10a4f09369baad027a464acb7a766/src/libcore/ops/function.rs:232 [INFO] [stdout] 33: 0x5635fe9697df - as core::ops::function::FnOnce>::call_once::h48069b269ca48108 [INFO] [stdout] at /rustc/28742a1146f10a4f09369baad027a464acb7a766/src/liballoc/boxed.rs:1008 [INFO] [stdout] 34: 0x5635fe97c6c3 - as core::ops::function::FnOnce>::call_once::heff660b32cd3afd8 [INFO] [stdout] at /rustc/28742a1146f10a4f09369baad027a464acb7a766/src/liballoc/boxed.rs:1008 [INFO] [stdout] 35: 0x5635fe97c6c3 - std::sys::unix::thread::Thread::new::thread_start::ha538939ed1e2e958 [INFO] [stdout] at src/libstd/sys/unix/thread.rs:87 [INFO] [stdout] 36: 0x7f69df1f66db - start_thread [INFO] [stdout] 37: 0x7f69ded0788f - __clone [INFO] [stdout] 38: 0x0 - [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] failures: [INFO] [stdout] tests [INFO] [stdout] [INFO] [stdout] test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out [INFO] [stdout] [INFO] [stderr] error: test failed, to rerun pass '--lib' [INFO] running `"docker" "inspect" "079cfe6608915070f9bc3e90a46b77fead70dd77277e7a107d7c1e54d5f9b759"` [INFO] running `"docker" "rm" "-f" "079cfe6608915070f9bc3e90a46b77fead70dd77277e7a107d7c1e54d5f9b759"` [INFO] [stdout] 079cfe6608915070f9bc3e90a46b77fead70dd77277e7a107d7c1e54d5f9b759