[INFO] cloning repository https://github.com/iamazy/rust-cookbook-code
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/iamazy/rust-cookbook-code" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiamazy%2Frust-cookbook-code", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiamazy%2Frust-cookbook-code'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b9655bc474384f12ed96d3d75ee65931d65ba9c6
[INFO] checking iamazy/rust-cookbook-code against master#195ad4830e11a544391abe296b146450dea8411b for pr-82781
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiamazy%2Frust-cookbook-code" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/iamazy/rust-cookbook-code on toolchain 195ad4830e11a544391abe296b146450dea8411b
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+195ad4830e11a544391abe296b146450dea8411b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/iamazy/rust-cookbook-code
[INFO] finished tweaking git repo https://github.com/iamazy/rust-cookbook-code
[INFO] tweaked toml for git repo https://github.com/iamazy/rust-cookbook-code written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/iamazy/rust-cookbook-code already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+195ad4830e11a544391abe296b146450dea8411b" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+195ad4830e11a544391abe296b146450dea8411b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 57a8c5fe46ff48b436f35fdd1b3125df985304df59194f149496849590cc612f
[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" "57a8c5fe46ff48b436f35fdd1b3125df985304df59194f149496849590cc612f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "57a8c5fe46ff48b436f35fdd1b3125df985304df59194f149496849590cc612f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "57a8c5fe46ff48b436f35fdd1b3125df985304df59194f149496849590cc612f", kill_on_drop: false }`
[INFO] [stdout] 57a8c5fe46ff48b436f35fdd1b3125df985304df59194f149496849590cc612f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+195ad4830e11a544391abe296b146450dea8411b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 324cbb5e1c4edd18c3a4cb2c813244a8c20c3cf2222ded83fc4b0ee4ea235cde
[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" "324cbb5e1c4edd18c3a4cb2c813244a8c20c3cf2222ded83fc4b0ee4ea235cde", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.67
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[INFO] [stderr]    Compiling raft-proto v0.6.0-alpha
[INFO] [stderr]     Checking raft v0.6.0-alpha
[INFO] [stderr]     Checking rust-cookbook-code v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]  --> examples/unpin.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     std::mem::replace(&mut *pinned_string, "other".to_string());
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]   = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 19s
[INFO] running `Command { std: "docker" "inspect" "324cbb5e1c4edd18c3a4cb2c813244a8c20c3cf2222ded83fc4b0ee4ea235cde", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "324cbb5e1c4edd18c3a4cb2c813244a8c20c3cf2222ded83fc4b0ee4ea235cde", kill_on_drop: false }`
[INFO] [stdout] 324cbb5e1c4edd18c3a4cb2c813244a8c20c3cf2222ded83fc4b0ee4ea235cde