[INFO] cloning repository https://github.com/maxm89/rsantas-workshop
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/maxm89/rsantas-workshop" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmaxm89%2Frsantas-workshop", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmaxm89%2Frsantas-workshop'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 33fb3b5b537c1de107095492b06615b9122f89a4
[INFO] checking maxm89/rsantas-workshop against master#39b841dfe36f90a7cd111e7f0c55f32594f6e578 for pr-77035
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmaxm89%2Frsantas-workshop" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/maxm89/rsantas-workshop on toolchain 39b841dfe36f90a7cd111e7f0c55f32594f6e578
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+39b841dfe36f90a7cd111e7f0c55f32594f6e578" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/maxm89/rsantas-workshop
[INFO] finished tweaking git repo https://github.com/maxm89/rsantas-workshop
[INFO] tweaked toml for git repo https://github.com/maxm89/rsantas-workshop written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/maxm89/rsantas-workshop already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+39b841dfe36f90a7cd111e7f0c55f32594f6e578" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: unused manifest key: profile.dev.unused_variables
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+39b841dfe36f90a7cd111e7f0c55f32594f6e578" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 92c7710becb8e85a8fa6ad9d66e2f605dc27fee285b2f32f01a2245830df9e50
[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" "92c7710becb8e85a8fa6ad9d66e2f605dc27fee285b2f32f01a2245830df9e50", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "92c7710becb8e85a8fa6ad9d66e2f605dc27fee285b2f32f01a2245830df9e50", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "92c7710becb8e85a8fa6ad9d66e2f605dc27fee285b2f32f01a2245830df9e50", kill_on_drop: false }`
[INFO] [stdout] 92c7710becb8e85a8fa6ad9d66e2f605dc27fee285b2f32f01a2245830df9e50
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+39b841dfe36f90a7cd111e7f0c55f32594f6e578" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c4f89812c0b1aff0b860ae5ef67bd5b89a147714afd37bad6dfabe9309e979ef
[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" "c4f89812c0b1aff0b860ae5ef67bd5b89a147714afd37bad6dfabe9309e979ef", kill_on_drop: false }`
[INFO] [stderr] warning: unused manifest key: profile.dev.unused_variables
[INFO] [stderr]    Compiling libc v0.2.66
[INFO] [stderr]    Compiling byteorder v1.3.2
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]    Compiling memchr v2.3.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.8
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]    Compiling serde v1.0.104
[INFO] [stderr]     Checking ppv-lite86 v0.2.6
[INFO] [stderr]    Compiling syn v1.0.13
[INFO] [stderr]     Checking c2-chacha v0.2.3
[INFO] [stderr]     Checking regex-automata v0.1.8
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking csv-core v0.1.6
[INFO] [stderr]     Checking rand_chacha v0.2.1
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking bstr v0.2.9
[INFO] [stderr]    Compiling serde_derive v1.0.104
[INFO] [stderr]     Checking csv v1.1.2
[INFO] [stderr]     Checking rsantas-workshop v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `crate::santa::Move`
[INFO] [stdout]  --> src/sa.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::santa::Move;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::santa::Move`
[INFO] [stdout]  --> src/sa.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::santa::Move;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[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/santa.rs:40:13
[INFO] [stdout]    |
[INFO] [stdout] 40 |         let mut costs: f32 = 0.0;
[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/santa.rs:40:13
[INFO] [stdout]    |
[INFO] [stdout] 40 |         let mut costs: f32 = 0.0;
[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/tabu_search.rs:25:17
[INFO] [stdout]    |
[INFO] [stdout] 25 |             let mut sol = initial::random(&self.families);
[INFO] [stdout]    |                 ----^^^
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/tabu_search.rs:25:17
[INFO] [stdout]    |
[INFO] [stdout] 25 |             let mut sol = initial::random(&self.families);
[INFO] [stdout]    |                 ----^^^
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 35.90s
[INFO] running `Command { std: "docker" "inspect" "c4f89812c0b1aff0b860ae5ef67bd5b89a147714afd37bad6dfabe9309e979ef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c4f89812c0b1aff0b860ae5ef67bd5b89a147714afd37bad6dfabe9309e979ef", kill_on_drop: false }`
[INFO] [stdout] c4f89812c0b1aff0b860ae5ef67bd5b89a147714afd37bad6dfabe9309e979ef