[INFO] fetching crate rustsync 0.2.3...
[INFO] checking rustsync-0.2.3 against master#c9228570668803e3e6402770d55f23a12c9ae686 for pr-79472
[INFO] extracting crate rustsync 0.2.3 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate rustsync 0.2.3 on toolchain c9228570668803e3e6402770d55f23a12c9ae686
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+c9228570668803e3e6402770d55f23a12c9ae686" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate rustsync 0.2.3
[INFO] finished tweaking crates.io crate rustsync 0.2.3
[INFO] tweaked toml for crates.io crate rustsync 0.2.3 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+c9228570668803e3e6402770d55f23a12c9ae686" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+c9228570668803e3e6402770d55f23a12c9ae686" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "+c9228570668803e3e6402770d55f23a12c9ae686" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 10e70736467af9dcb9de84015ebb89ba1a3359a0bf3182d5e9f588e060952b9a
[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" "10e70736467af9dcb9de84015ebb89ba1a3359a0bf3182d5e9f588e060952b9a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "10e70736467af9dcb9de84015ebb89ba1a3359a0bf3182d5e9f588e060952b9a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "10e70736467af9dcb9de84015ebb89ba1a3359a0bf3182d5e9f588e060952b9a", kill_on_drop: false }`
[INFO] [stdout] 10e70736467af9dcb9de84015ebb89ba1a3359a0bf3182d5e9f588e060952b9a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "+c9228570668803e3e6402770d55f23a12c9ae686" "check" "--frozen" "--all" "--all-targets" "--message-format=json", 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] cc1ad10c1606b76cbb9e2d39fe2b3f52e533f2d2e39ce669472772453c0dd8a7
[INFO] running `Command { std: "docker" "start" "-a" "cc1ad10c1606b76cbb9e2d39fe2b3f52e533f2d2e39ce669472772453c0dd8a7", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.81
[INFO] [stderr]    Compiling syn v1.0.54
[INFO] [stderr]    Compiling serde v1.0.118
[INFO] [stderr]     Checking nodrop v0.1.14
[INFO] [stderr]     Checking arrayvec v0.4.12
[INFO] [stderr]     Checking blake2-rfc v0.2.18
[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking net2 v0.2.36
[INFO] [stderr]     Checking parking_lot_core v0.6.2
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]     Checking tokio-threadpool v0.1.18
[INFO] [stderr]     Checking parking_lot v0.9.0
[INFO] [stderr]     Checking mio v0.6.23
[INFO] [stderr]     Checking tokio-io v0.1.13
[INFO] [stderr]     Checking mio-uds v0.6.8
[INFO] [stderr]     Checking tokio-reactor v0.1.12
[INFO] [stderr]     Checking tokio-codec v0.1.2
[INFO] [stderr]     Checking tokio-fs v0.1.7
[INFO] [stderr]     Checking tokio-uds v0.2.7
[INFO] [stderr]     Checking tokio-udp v0.1.6
[INFO] [stderr]     Checking tokio-tcp v0.1.4
[INFO] [stderr]     Checking tokio v0.1.22
[INFO] [stderr]     Checking tokio-core v0.1.18
[INFO] [stderr]    Compiling serde_derive v1.0.118
[INFO] [stderr]     Checking rustsync v0.2.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/lib.rs:243:41
[INFO] [stdout]     |
[INFO] [stdout] 243 |                 if let Async::Ready((r, mut block, len)) = reading.poll()? {
[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:430:29
[INFO] [stdout]     |
[INFO] [stdout] 430 |                         let mut hash = adler32::RollingAdler32::from_buffer(&block.as_ref()[..len]);
[INFO] [stdout]     |                             ----^^^^
[INFO] [stdout]     |                             |
[INFO] [stdout]     |                             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/lib.rs:243:41
[INFO] [stdout]     |
[INFO] [stdout] 243 |                 if let Async::Ready((r, mut block, len)) = reading.poll()? {
[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:430:29
[INFO] [stdout]     |
[INFO] [stdout] 430 |                         let mut hash = adler32::RollingAdler32::from_buffer(&block.as_ref()[..len]);
[INFO] [stdout]     |                             ----^^^^
[INFO] [stdout]     |                             |
[INFO] [stdout]     |                             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 32.86s
[INFO] running `Command { std: "docker" "inspect" "cc1ad10c1606b76cbb9e2d39fe2b3f52e533f2d2e39ce669472772453c0dd8a7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cc1ad10c1606b76cbb9e2d39fe2b3f52e533f2d2e39ce669472772453c0dd8a7", kill_on_drop: false }`
[INFO] [stdout] cc1ad10c1606b76cbb9e2d39fe2b3f52e533f2d2e39ce669472772453c0dd8a7