[INFO] fetching crate yubico_manager 0.7.0...
[INFO] checking yubico_manager-0.7.0 against beta for pr-78714
[INFO] extracting crate yubico_manager 0.7.0 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate yubico_manager 0.7.0 on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate yubico_manager 0.7.0
[INFO] finished tweaking crates.io crate yubico_manager 0.7.0
[INFO] tweaked toml for crates.io crate yubico_manager 0.7.0 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate crates.io crate yubico_manager 0.7.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b56fa4070292892e5ddb651cd4a6c83763fc7cbb1a71bf2cf568c5c6f741a04f
[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" "b56fa4070292892e5ddb651cd4a6c83763fc7cbb1a71bf2cf568c5c6f741a04f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b56fa4070292892e5ddb651cd4a6c83763fc7cbb1a71bf2cf568c5c6f741a04f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b56fa4070292892e5ddb651cd4a6c83763fc7cbb1a71bf2cf568c5c6f741a04f", kill_on_drop: false }`
[INFO] [stdout] b56fa4070292892e5ddb651cd4a6c83763fc7cbb1a71bf2cf568c5c6f741a04f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "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] a9eca8c2080cce34b0595f1c0e3acccb4b95cac0b2b6b0fa45a4a4e3e6b1d928
[INFO] running `Command { std: "docker" "start" "-a" "a9eca8c2080cce34b0595f1c0e3acccb4b95cac0b2b6b0fa45a4a4e3e6b1d928", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.72
[INFO] [stderr]    Compiling proc-macro-hack-impl v0.4.2
[INFO] [stderr]     Checking cpuid-bool v0.1.1
[INFO] [stderr]    Compiling libusb-sys v0.2.3
[INFO] [stderr]     Checking bit-set v0.2.0
[INFO] [stderr]     Checking block-cipher v0.7.1
[INFO] [stderr]     Checking sha-1 v0.9.1
[INFO] [stderr]     Checking block-modes v0.5.0
[INFO] [stderr]     Checking aes-soft v0.4.0
[INFO] [stderr]    Compiling proc-macro-hack v0.4.2
[INFO] [stderr]    Compiling structure-macro-impl v0.1.2
[INFO] [stderr]     Checking getrandom v0.1.14
[INFO] [stderr]     Checking structure v0.1.2
[INFO] [stderr]     Checking libusb v0.3.0
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking yubico_manager v0.7.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> examples/configuration_hmac.rs:22:13
[INFO] [stdout]    |
[INFO] [stdout] 22 |         let mut rng = thread_rng();
[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] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 10.10s
[INFO] running `Command { std: "docker" "inspect" "a9eca8c2080cce34b0595f1c0e3acccb4b95cac0b2b6b0fa45a4a4e3e6b1d928", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a9eca8c2080cce34b0595f1c0e3acccb4b95cac0b2b6b0fa45a4a4e3e6b1d928", kill_on_drop: false }`
[INFO] [stdout] a9eca8c2080cce34b0595f1c0e3acccb4b95cac0b2b6b0fa45a4a4e3e6b1d928