[INFO] fetching crate cold 0.0.2...
[INFO] checking cold-0.0.2 against master#38352b01ae4af9300be03b805d6db68c45e51068 for pr-129864
[INFO] extracting crate cold 0.0.2 into /workspace/builds/worker-3-tc1/source
[INFO] validating manifest of crates.io crate cold 0.0.2 on toolchain 38352b01ae4af9300be03b805d6db68c45e51068
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+38352b01ae4af9300be03b805d6db68c45e51068" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate cold 0.0.2
[INFO] finished tweaking crates.io crate cold 0.0.2
[INFO] tweaked toml for crates.io crate cold 0.0.2 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+38352b01ae4af9300be03b805d6db68c45e51068" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 36 packages to latest compatible versions
[INFO] [stderr]       Adding mio v0.7.14 (available: v1.0.2)
[INFO] [stderr]       Adding miow v0.3.7 (available: v0.6.0)
[INFO] [stderr]       Adding ntapi v0.3.7 (available: v0.4.1)
[INFO] [stderr]       Adding redox_syscall v0.1.57 (available: v0.5.6)
[INFO] [stderr]       Adding thread-id v3.3.0 (available: v4.2.2)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+38352b01ae4af9300be03b805d6db68c45e51068" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded mio v0.7.14
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+38352b01ae4af9300be03b805d6db68c45e51068" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 22159096a5ca4f84c7e02149a702dda60081101b5977360330726be36e9f28fc
[INFO] running `Command { std: "docker" "start" "-a" "22159096a5ca4f84c7e02149a702dda60081101b5977360330726be36e9f28fc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "22159096a5ca4f84c7e02149a702dda60081101b5977360330726be36e9f28fc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "22159096a5ca4f84c7e02149a702dda60081101b5977360330726be36e9f28fc", kill_on_drop: false }`
[INFO] [stdout] 22159096a5ca4f84c7e02149a702dda60081101b5977360330726be36e9f28fc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+38352b01ae4af9300be03b805d6db68c45e51068" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 20996cbe0a8d2acc45c74ae8d768e7ad11360845d59f1227abbcab90b2c64dca
[INFO] running `Command { std: "docker" "start" "-a" "20996cbe0a8d2acc45c74ae8d768e7ad11360845d59f1227abbcab90b2c64dca", kill_on_drop: false }`
[INFO] [stderr]     Checking futures-core v0.3.30
[INFO] [stderr]    Compiling syn v2.0.77
[INFO] [stderr]     Checking crossbeam-epoch v0.9.18
[INFO] [stderr]     Checking crossbeam-queue v0.3.11
[INFO] [stderr]     Checking crossbeam-channel v0.5.13
[INFO] [stderr]     Checking thread-id v3.3.0
[INFO] [stderr]     Checking mio v0.7.14
[INFO] [stderr]     Checking simple-logging v2.0.2
[INFO] [stderr]     Checking futures-channel v0.3.30
[INFO] [stderr]     Checking crossbeam-deque v0.8.5
[INFO] [stderr]     Checking crossbeam v0.8.4
[INFO] [stderr]    Compiling futures-macro v0.3.30
[INFO] [stderr]     Checking futures-util v0.3.30
[INFO] [stderr]     Checking futures-executor v0.3.30
[INFO] [stderr]     Checking futures v0.3.30
[INFO] [stderr]     Checking cold v0.0.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/rt.rs:127:13
[INFO] [stdout]     |
[INFO] [stdout] 127 |         let mut ctx = ctxs.get_mut(&self.this).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/rt.rs:127:13
[INFO] [stdout]     |
[INFO] [stdout] 127 |         let mut ctx = ctxs.get_mut(&self.this).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` profile [unoptimized + debuginfo] target(s) in 6.38s
[INFO] running `Command { std: "docker" "inspect" "20996cbe0a8d2acc45c74ae8d768e7ad11360845d59f1227abbcab90b2c64dca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "20996cbe0a8d2acc45c74ae8d768e7ad11360845d59f1227abbcab90b2c64dca", kill_on_drop: false }`
[INFO] [stdout] 20996cbe0a8d2acc45c74ae8d768e7ad11360845d59f1227abbcab90b2c64dca