[INFO] fetching crate pelt 0.1.0...
[INFO] testing pelt-0.1.0 against 1.59.0 for beta-1.60-1
[INFO] extracting crate pelt 0.1.0 into /workspace/builds/worker-80/source
[INFO] validating manifest of crates.io crate pelt 0.1.0 on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate pelt 0.1.0
[INFO] finished tweaking crates.io crate pelt 0.1.0
[INFO] tweaked toml for crates.io crate pelt 0.1.0 written to /workspace/builds/worker-80/source/Cargo.toml
[INFO] crate crates.io crate pelt 0.1.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-80/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-80/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 18c83ec0fd1f3e844d8790f95500dfcffb5501735b271b9e12c440535bba3ce5
[INFO] running `Command { std: "docker" "start" "-a" "18c83ec0fd1f3e844d8790f95500dfcffb5501735b271b9e12c440535bba3ce5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "18c83ec0fd1f3e844d8790f95500dfcffb5501735b271b9e12c440535bba3ce5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "18c83ec0fd1f3e844d8790f95500dfcffb5501735b271b9e12c440535bba3ce5", kill_on_drop: false }`
[INFO] [stdout] 18c83ec0fd1f3e844d8790f95500dfcffb5501735b271b9e12c440535bba3ce5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-80/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-80/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" "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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 87a48561693fba8f75ee4ed446f7cda6242e5aa75314a4ac2f4b1c5a19ef5887
[INFO] running `Command { std: "docker" "start" "-a" "87a48561693fba8f75ee4ed446f7cda6242e5aa75314a4ac2f4b1c5a19ef5887", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling fnv v1.0.6
[INFO] [stderr]    Compiling pelt v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: use of deprecated associated function `core::slice::<impl [T]>::partition_at_index_by`: use select_nth_unstable_by() instead
[INFO] [stdout]   --> src/cost.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 36 |         *x.partition_at_index_by(idx, |a, b| a.partial_cmp(b).unwrap())
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]    --> src/alg.rs:139:27
[INFO] [stdout]     |
[INFO] [stdout] 139 |                 .filter(|(t, sum_loss)| sum_loss < &(loss_current_part))
[INFO] [stdout]     |                           ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `sum_loss`
[INFO] [stdout]    --> src/alg.rs:141:27
[INFO] [stdout]     |
[INFO] [stdout] 141 |                 .map(|(t, sum_loss)| *t)
[INFO] [stdout]     |                           ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_sum_loss`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `start`
[INFO] [stdout]    --> src/alg.rs:145:57
[INFO] [stdout]     |
[INFO] [stdout] 145 |         let mut cp: Vec<usize> = best_part.keys().map(|(start, end)| *end).collect();
[INFO] [stdout]     |                                                         ^^^^^ help: if this is intentional, prefix it with an underscore: `_start`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `nlogn_median`
[INFO] [stdout]   --> src/cost.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn nlogn_median(numbers: &[f64]) -> Option<f64> {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 36 | #![feature(test)]
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:37:12
[INFO] [stdout]    |
[INFO] [stdout] 37 | #![feature(slice_partition_at_index)]
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors; 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `pelt` due to 3 previous errors; 5 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "87a48561693fba8f75ee4ed446f7cda6242e5aa75314a4ac2f4b1c5a19ef5887", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "87a48561693fba8f75ee4ed446f7cda6242e5aa75314a4ac2f4b1c5a19ef5887", kill_on_drop: false }`
[INFO] [stdout] 87a48561693fba8f75ee4ed446f7cda6242e5aa75314a4ac2f4b1c5a19ef5887