[INFO] fetching crate algorithms_fourth 0.1.10...
[INFO] checking algorithms_fourth-0.1.10 against master#b0696a5160711c068cb1f01b7437db7990d15750 for pr-121848
[INFO] extracting crate algorithms_fourth 0.1.10 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate algorithms_fourth 0.1.10 on toolchain b0696a5160711c068cb1f01b7437db7990d15750
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b0696a5160711c068cb1f01b7437db7990d15750" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate algorithms_fourth 0.1.10
[INFO] finished tweaking crates.io crate algorithms_fourth 0.1.10
[INFO] tweaked toml for crates.io crate algorithms_fourth 0.1.10 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate crates.io crate algorithms_fourth 0.1.10 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" "+b0696a5160711c068cb1f01b7437db7990d15750" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded libc v0.2.140
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+b0696a5160711c068cb1f01b7437db7990d15750" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7654a8f60a35de880cf9185224c7da82421f0e975ca634c654e4a65068d43d50
[INFO] running `Command { std: "docker" "start" "-a" "7654a8f60a35de880cf9185224c7da82421f0e975ca634c654e4a65068d43d50", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7654a8f60a35de880cf9185224c7da82421f0e975ca634c654e4a65068d43d50", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7654a8f60a35de880cf9185224c7da82421f0e975ca634c654e4a65068d43d50", kill_on_drop: false }`
[INFO] [stdout] 7654a8f60a35de880cf9185224c7da82421f0e975ca634c654e4a65068d43d50
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+b0696a5160711c068cb1f01b7437db7990d15750" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a1fe560779e08210560b7598031403ef4bd232f64c3e297d29fce8af884160cb
[INFO] running `Command { std: "docker" "start" "-a" "a1fe560779e08210560b7598031403ef4bd232f64c3e297d29fce8af884160cb", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.140
[INFO] [stderr]     Checking getrandom v0.2.8
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking algorithms_fourth v0.1.10 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `rand` is imported redundantly
[INFO] [stdout]   --> src/lib.rs:37:16
[INFO] [stdout]    |
[INFO] [stdout] 37 |     use rand::{self, seq::SliceRandom};
[INFO] [stdout]    |                ^^^^ the item `rand` is already defined here
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/search/sequential.rs:58:25
[INFO] [stdout]    |
[INFO] [stdout] 58 |                     let mut p = first;
[INFO] [stdout]    |                         ----^
[INFO] [stdout]    |                         |
[INFO] [stdout]    |                         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/search/sequential.rs:58:25
[INFO] [stdout]    |
[INFO] [stdout] 58 |                     let mut p = first;
[INFO] [stdout]    |                         ----^
[INFO] [stdout]    |                         |
[INFO] [stdout]    |                         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.48s
[INFO] running `Command { std: "docker" "inspect" "a1fe560779e08210560b7598031403ef4bd232f64c3e297d29fce8af884160cb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a1fe560779e08210560b7598031403ef4bd232f64c3e297d29fce8af884160cb", kill_on_drop: false }`
[INFO] [stdout] a1fe560779e08210560b7598031403ef4bd232f64c3e297d29fce8af884160cb
[INFO] checking algorithms_fourth-0.1.10 against try#bfe97fcae016881ad333f0ff8cea2cadb9cf136c for pr-121848
[INFO] extracting crate algorithms_fourth 0.1.10 into /workspace/builds/worker-4-tc2/source
[INFO] validating manifest of crates.io crate algorithms_fourth 0.1.10 on toolchain bfe97fcae016881ad333f0ff8cea2cadb9cf136c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+bfe97fcae016881ad333f0ff8cea2cadb9cf136c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate algorithms_fourth 0.1.10
[INFO] finished tweaking crates.io crate algorithms_fourth 0.1.10
[INFO] tweaked toml for crates.io crate algorithms_fourth 0.1.10 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate crates.io crate algorithms_fourth 0.1.10 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" "+bfe97fcae016881ad333f0ff8cea2cadb9cf136c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+bfe97fcae016881ad333f0ff8cea2cadb9cf136c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d291be49b90463aa4cb4fcb0d1dc5bd4170b1282449e604900dd4c00f83b39ac
[INFO] running `Command { std: "docker" "start" "-a" "d291be49b90463aa4cb4fcb0d1dc5bd4170b1282449e604900dd4c00f83b39ac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d291be49b90463aa4cb4fcb0d1dc5bd4170b1282449e604900dd4c00f83b39ac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d291be49b90463aa4cb4fcb0d1dc5bd4170b1282449e604900dd4c00f83b39ac", kill_on_drop: false }`
[INFO] [stdout] d291be49b90463aa4cb4fcb0d1dc5bd4170b1282449e604900dd4c00f83b39ac
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+bfe97fcae016881ad333f0ff8cea2cadb9cf136c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 54fbe1d4b79c22b7d2d2af62b40ac48d39e21e7f1a0252ee6acbf6b3881a9e78
[INFO] running `Command { std: "docker" "start" "-a" "54fbe1d4b79c22b7d2d2af62b40ac48d39e21e7f1a0252ee6acbf6b3881a9e78", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.140
[INFO] [stderr]     Checking getrandom v0.2.8
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking algorithms_fourth v0.1.10 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `rand` is imported redundantly
[INFO] [stdout]   --> src/lib.rs:37:16
[INFO] [stdout]    |
[INFO] [stdout] 37 |     use rand::{self, seq::SliceRandom};
[INFO] [stdout]    |                ^^^^ the item `rand` is already defined here
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/search/sequential.rs:58:25
[INFO] [stdout]    |
[INFO] [stdout] 58 |                     let mut p = first;
[INFO] [stdout]    |                         ----^
[INFO] [stdout]    |                         |
[INFO] [stdout]    |                         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/search/sequential.rs:58:25
[INFO] [stdout]    |
[INFO] [stdout] 58 |                     let mut p = first;
[INFO] [stdout]    |                         ----^
[INFO] [stdout]    |                         |
[INFO] [stdout]    |                         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.48s
[INFO] running `Command { std: "docker" "inspect" "54fbe1d4b79c22b7d2d2af62b40ac48d39e21e7f1a0252ee6acbf6b3881a9e78", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "54fbe1d4b79c22b7d2d2af62b40ac48d39e21e7f1a0252ee6acbf6b3881a9e78", kill_on_drop: false }`
[INFO] [stdout] 54fbe1d4b79c22b7d2d2af62b40ac48d39e21e7f1a0252ee6acbf6b3881a9e78
