[INFO] cloning repository https://github.com/perlun/copper.rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/perlun/copper.rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fperlun%2Fcopper.rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fperlun%2Fcopper.rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1cabd3709594750f41344bfaf4891b6edab2de04
[INFO] checking perlun/copper.rs against master#9503ea19edbf01b9435e80e17d60ce1b88390116 for pr-81782
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fperlun%2Fcopper.rs" "/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/perlun/copper.rs on toolchain 9503ea19edbf01b9435e80e17d60ce1b88390116
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9503ea19edbf01b9435e80e17d60ce1b88390116" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/perlun/copper.rs
[INFO] finished tweaking git repo https://github.com/perlun/copper.rs
[INFO] tweaked toml for git repo https://github.com/perlun/copper.rs written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/perlun/copper.rs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9503ea19edbf01b9435e80e17d60ce1b88390116" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] error: the lock file /workspace/builds/worker-7/source/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] [stderr] If you want to try to generate the lock file without accessing the network, use the --offline flag.
[INFO] the lockfile is outdated, regenerating it
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9503ea19edbf01b9435e80e17d60ce1b88390116" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9503ea19edbf01b9435e80e17d60ce1b88390116" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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" "+9503ea19edbf01b9435e80e17d60ce1b88390116" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4fd3763e0ff0dc39d9775284c89e0cd966cfe9dbec9f46210a40b98ec5ef49ee
[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" "4fd3763e0ff0dc39d9775284c89e0cd966cfe9dbec9f46210a40b98ec5ef49ee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4fd3763e0ff0dc39d9775284c89e0cd966cfe9dbec9f46210a40b98ec5ef49ee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4fd3763e0ff0dc39d9775284c89e0cd966cfe9dbec9f46210a40b98ec5ef49ee", kill_on_drop: false }`
[INFO] [stdout] 4fd3763e0ff0dc39d9775284c89e0cd966cfe9dbec9f46210a40b98ec5ef49ee
[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" "+9503ea19edbf01b9435e80e17d60ce1b88390116" "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] bed143d881398c9ff41a129db04f46a6ed8d3b12de8731586f832bcf52de4f5f
[INFO] running `Command { std: "docker" "start" "-a" "bed143d881398c9ff41a129db04f46a6ed8d3b12de8731586f832bcf52de4f5f", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.86
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]     Checking matches v0.1.8
[INFO] [stderr]    Compiling serde v1.0.123
[INFO] [stderr]     Checking language-tags v0.2.2
[INFO] [stderr]     Checking serde v0.7.15
[INFO] [stderr]    Compiling serde_json v1.0.63
[INFO] [stderr]     Checking rustc-serialize v0.3.24
[INFO] [stderr]     Checking itoa v0.4.7
[INFO] [stderr]     Checking yaml-rust v0.3.5
[INFO] [stderr]     Checking quick-error v1.2.3
[INFO] [stderr]     Checking groupable v0.2.0
[INFO] [stderr]     Checking crossbeam v0.2.12
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]     Checking unsafe-any v0.4.2
[INFO] [stderr]     Checking unicode-bidi v0.3.4
[INFO] [stderr]     Checking unicode-bidi v0.2.6
[INFO] [stderr]     Checking humantime v0.1.3
[INFO] [stderr]     Checking typemap v0.3.3
[INFO] [stderr]     Checking plugin v0.2.6
[INFO] [stderr]     Checking log v0.3.9
[INFO] [stderr]     Checking idna v0.1.5
[INFO] [stderr]     Checking mime v0.2.6
[INFO] [stderr]     Checking hpack v0.2.0
[INFO] [stderr]     Checking solicit v0.4.4
[INFO] [stderr]     Checking url v1.7.2
[INFO] [stderr]     Checking time v0.1.44
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking num_cpus v0.2.13
[INFO] [stderr]     Checking serde_yaml v0.2.5
[INFO] [stderr]     Checking hyper v0.10.16
[INFO] [stderr]     Checking cookie v0.2.5
[INFO] [stderr]     Checking num v0.1.42
[INFO] [stderr]     Checking ordered-float v0.1.0
[INFO] [stderr]     Checking chrono v0.2.25
[INFO] [stderr]     Checking serde-value v0.2.1
[INFO] [stderr]     Checking rand v0.3.23
[INFO] [stderr]     Checking uuid v0.2.3
[INFO] [stderr]     Checking url v0.5.10
[INFO] [stderr]     Checking log4rs v0.4.8
[INFO] [stderr]     Checking mustache v0.9.0
[INFO] [stderr]     Checking hyper v0.8.1
[INFO] [stderr]     Checking nickel v0.11.0
[INFO] [stderr]     Checking copper v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:39:5
[INFO] [stdout]    |
[INFO] [stdout] 39 |     server.listen(&host[..]);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:39:5
[INFO] [stdout]    |
[INFO] [stdout] 39 |     server.listen(&host[..]);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[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 25.68s
[INFO] running `Command { std: "docker" "inspect" "bed143d881398c9ff41a129db04f46a6ed8d3b12de8731586f832bcf52de4f5f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bed143d881398c9ff41a129db04f46a6ed8d3b12de8731586f832bcf52de4f5f", kill_on_drop: false }`
[INFO] [stdout] bed143d881398c9ff41a129db04f46a6ed8d3b12de8731586f832bcf52de4f5f