[INFO] cloning repository https://github.com/Idolf/rust-str-fuzz
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Idolf/rust-str-fuzz" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FIdolf%2Frust-str-fuzz", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FIdolf%2Frust-str-fuzz'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 630311fdcdc1320f7d1aa06dcf9175029c4233f1
[INFO] checking Idolf/rust-str-fuzz against try#45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4 for pr-83744
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FIdolf%2Frust-str-fuzz" "/workspace/builds/worker-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Idolf/rust-str-fuzz on toolchain 45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Idolf/rust-str-fuzz
[INFO] finished tweaking git repo https://github.com/Idolf/rust-str-fuzz
[INFO] tweaked toml for git repo https://github.com/Idolf/rust-str-fuzz written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/Idolf/rust-str-fuzz already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating git repository `https://github.com/tokio-rs/tokio.git`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded cfg-if v0.1.3
[INFO] [stderr]   Downloaded bytes v0.4.7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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:c46a2d1a26fb48b37929c74ca49dd9409f2375a0a3bdb8fe07617f3ffccaa889" "/opt/rustwide/cargo-home/bin/cargo" "+45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] dcdb58e5633b3478b389dfb82b57329c0510deef0d4090557a22b7152027d569
[INFO] running `Command { std: "docker" "start" "-a" "dcdb58e5633b3478b389dfb82b57329c0510deef0d4090557a22b7152027d569", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dcdb58e5633b3478b389dfb82b57329c0510deef0d4090557a22b7152027d569", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dcdb58e5633b3478b389dfb82b57329c0510deef0d4090557a22b7152027d569", kill_on_drop: false }`
[INFO] [stdout] dcdb58e5633b3478b389dfb82b57329c0510deef0d4090557a22b7152027d569
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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:c46a2d1a26fb48b37929c74ca49dd9409f2375a0a3bdb8fe07617f3ffccaa889" "/opt/rustwide/cargo-home/bin/cargo" "+45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c816926f9a29a02bbb280e1ec5632afec45a415ac2ec3152c6e49be94c6a8107
[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" "c816926f9a29a02bbb280e1ec5632afec45a415ac2ec3152c6e49be94c6a8107", kill_on_drop: false }`
[INFO] [stderr]     Checking libc v0.2.41
[INFO] [stderr]     Checking futures v0.1.21
[INFO] [stderr]     Checking nodrop v0.1.12
[INFO] [stderr]     Checking lazy_static v1.0.0
[INFO] [stderr]     Checking lazycell v0.6.0
[INFO] [stderr]     Checking crossbeam-utils v0.3.2
[INFO] [stderr]     Checking arrayvec v0.4.7
[INFO] [stderr]     Checking crossbeam-epoch v0.4.1
[INFO] [stderr]     Checking iovec v0.1.2
[INFO] [stderr]     Checking net2 v0.2.32
[INFO] [stderr]     Checking rand v0.4.2
[INFO] [stderr]     Checking num_cpus v1.8.0
[INFO] [stderr]     Checking crossbeam-deque v0.3.1
[INFO] [stderr]     Checking bytes v0.4.7
[INFO] [stderr]     Checking mio v0.6.14
[INFO] [stderr]     Checking tokio-executor v0.1.2 (https://github.com/tokio-rs/tokio.git#8c791fd0)
[INFO] [stderr]     Checking tokio-io v0.1.6 (https://github.com/tokio-rs/tokio.git#8c791fd0)
[INFO] [stderr]     Checking tokio-threadpool v0.1.3 (https://github.com/tokio-rs/tokio.git#8c791fd0)
[INFO] [stderr]     Checking tokio-timer v0.2.3 (https://github.com/tokio-rs/tokio.git#8c791fd0)
[INFO] [stderr]     Checking tokio-reactor v0.1.1 (https://github.com/tokio-rs/tokio.git#8c791fd0)
[INFO] [stderr]     Checking tokio-udp v0.1.0 (https://github.com/tokio-rs/tokio.git#8c791fd0)
[INFO] [stderr]     Checking tokio-tcp v0.1.0 (https://github.com/tokio-rs/tokio.git#8c791fd0)
[INFO] [stderr]     Checking tokio-fs v0.1.0 (https://github.com/tokio-rs/tokio.git#8c791fd0)
[INFO] [stderr]     Checking tokio v0.1.6 (https://github.com/tokio-rs/tokio.git#8c791fd0)
[INFO] [stderr]     Checking foo v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |     let mut threadpool = threadpool_builder.build();
[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/main.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |     let mut threadpool = threadpool_builder.build();
[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 12.00s
[INFO] running `Command { std: "docker" "inspect" "c816926f9a29a02bbb280e1ec5632afec45a415ac2ec3152c6e49be94c6a8107", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c816926f9a29a02bbb280e1ec5632afec45a415ac2ec3152c6e49be94c6a8107", kill_on_drop: false }`
[INFO] [stdout] c816926f9a29a02bbb280e1ec5632afec45a415ac2ec3152c6e49be94c6a8107