[INFO] updating cached repository https://github.com/sscdotopen/puppies
[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] c51e6a702c8cdbe4d8d271cce9687174af290b8f
[INFO] checking sscdotopen/puppies against master#c724b67e1b474262917a5154d74e7072267593fe for pr-74315
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsscdotopen%2Fpuppies" "/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/sscdotopen/puppies on toolchain c724b67e1b474262917a5154d74e7072267593fe
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+c724b67e1b474262917a5154d74e7072267593fe" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/sscdotopen/puppies
[INFO] finished tweaking git repo https://github.com/sscdotopen/puppies
[INFO] tweaked toml for git repo https://github.com/sscdotopen/puppies written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/sscdotopen/puppies already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+c724b67e1b474262917a5154d74e7072267593fe" "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@sha256:38e1b949b06cde1964af550a6e548bd9b2b2ea170003ae122f8fc0886596cc07" "/opt/rustwide/cargo-home/bin/cargo" "+c724b67e1b474262917a5154d74e7072267593fe" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 609429e3e909f952d48b6849255948d6e0e6442f3d08d8e10a1a143cdfa6e8d7
[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" "609429e3e909f952d48b6849255948d6e0e6442f3d08d8e10a1a143cdfa6e8d7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "609429e3e909f952d48b6849255948d6e0e6442f3d08d8e10a1a143cdfa6e8d7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "609429e3e909f952d48b6849255948d6e0e6442f3d08d8e10a1a143cdfa6e8d7", kill_on_drop: false }`
[INFO] [stdout] 609429e3e909f952d48b6849255948d6e0e6442f3d08d8e10a1a143cdfa6e8d7
[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=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@sha256:38e1b949b06cde1964af550a6e548bd9b2b2ea170003ae122f8fc0886596cc07" "/opt/rustwide/cargo-home/bin/cargo" "+c724b67e1b474262917a5154d74e7072267593fe" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e9a7918e1968929ed33a41fdb3313c3806d7d706a8777e23c9ab9177c35a96a0
[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" "e9a7918e1968929ed33a41fdb3313c3806d7d706a8777e23c9ab9177c35a96a0", kill_on_drop: false }`
[INFO] [stderr]     Checking libc v0.2.29
[INFO] [stderr]     Checking variance v0.1.3
[INFO] [stderr]     Checking rustc-serialize v0.3.24
[INFO] [stderr]     Checking byteorder v1.1.0
[INFO] [stderr]     Checking scopeguard v0.1.2
[INFO] [stderr]     Checking crossbeam v0.2.10
[INFO] [stderr]     Checking fnv v1.0.5
[INFO] [stderr]     Checking bencher v0.1.3
[INFO] [stderr]     Checking scoped-pool v1.0.0
[INFO] [stderr]     Checking memchr v1.0.1
[INFO] [stderr]     Checking rand v0.3.16
[INFO] [stderr]     Checking csv v0.15.0
[INFO] [stderr]     Checking puppies v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/lib.rs:83:21
[INFO] [stdout]    |
[INFO] [stdout] 83 |                 let mut user_history = samples_of_a.get_mut(user_idx).unwrap();
[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/lib.rs:83:21
[INFO] [stdout]    |
[INFO] [stdout] 83 |                 let mut user_history = samples_of_a.get_mut(user_idx).unwrap();
[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: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.39s
[INFO] running `Command { std: "docker" "inspect" "e9a7918e1968929ed33a41fdb3313c3806d7d706a8777e23c9ab9177c35a96a0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e9a7918e1968929ed33a41fdb3313c3806d7d706a8777e23c9ab9177c35a96a0", kill_on_drop: false }`
[INFO] [stdout] e9a7918e1968929ed33a41fdb3313c3806d7d706a8777e23c9ab9177c35a96a0