[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 try#5fdfba63a96c5e8ae0ebf6b8b66853110277087d for pr-73166
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fperlun%2Fcopper.rs" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/perlun/copper.rs on toolchain 5fdfba63a96c5e8ae0ebf6b8b66853110277087d
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5fdfba63a96c5e8ae0ebf6b8b66853110277087d" "read-manifest" "--manifest-path" "Cargo.toml", 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-4/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" "+5fdfba63a96c5e8ae0ebf6b8b66853110277087d" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] error: the lock file /workspace/builds/worker-4/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[INFO] the lockfile is outdated, regenerating it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" "+5fdfba63a96c5e8ae0ebf6b8b66853110277087d" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5fdfba63a96c5e8ae0ebf6b8b66853110277087d" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+5fdfba63a96c5e8ae0ebf6b8b66853110277087d" "metadata" "--no-deps" "--format-version=1", 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] efdd6583edf72b948a65b26ae282bbe31db5f5386bb2e25855b33e265997e048
[INFO] running `Command { std: "docker" "start" "-a" "efdd6583edf72b948a65b26ae282bbe31db5f5386bb2e25855b33e265997e048", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "efdd6583edf72b948a65b26ae282bbe31db5f5386bb2e25855b33e265997e048", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "efdd6583edf72b948a65b26ae282bbe31db5f5386bb2e25855b33e265997e048", kill_on_drop: false }`
[INFO] [stdout] efdd6583edf72b948a65b26ae282bbe31db5f5386bb2e25855b33e265997e048
[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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+5fdfba63a96c5e8ae0ebf6b8b66853110277087d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6981b2bade683bd86f8b390346759626ae349ddb054ed9f9032a047101f7a061
[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" "6981b2bade683bd86f8b390346759626ae349ddb054ed9f9032a047101f7a061", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.74
[INFO] [stderr]     Checking matches v0.1.8
[INFO] [stderr]    Compiling version_check v0.1.5
[INFO] [stderr]     Checking traitobject v0.1.0
[INFO] [stderr]     Checking percent-encoding v1.0.1
[INFO] [stderr]    Compiling serde v1.0.114
[INFO] [stderr]     Checking safemem v0.3.3
[INFO] [stderr]     Checking typeable v0.1.2
[INFO] [stderr]    Compiling serde_json v1.0.57
[INFO] [stderr]     Checking language-tags v0.2.2
[INFO] [stderr]     Checking serde v0.7.15
[INFO] [stderr]     Checking rustc-serialize v0.3.24
[INFO] [stderr]     Checking yaml-rust v0.3.5
[INFO] [stderr]     Checking itoa v0.4.6
[INFO] [stderr]     Checking traitobject v0.0.1
[INFO] [stderr]     Checking modifier v0.1.0
[INFO] [stderr]     Checking antidote v1.0.0
[INFO] [stderr]     Checking groupable v0.2.0
[INFO] [stderr]     Checking crossbeam v0.2.12
[INFO] [stderr]    Compiling num-iter v0.1.41
[INFO] [stderr]     Checking humantime v0.1.3
[INFO] [stderr]     Checking unicode-bidi v0.3.4
[INFO] [stderr]     Checking unicode-bidi v0.2.6
[INFO] [stderr]     Checking unsafe-any v0.4.2
[INFO] [stderr]     Checking base64 v0.9.3
[INFO] [stderr]     Checking typemap v0.3.3
[INFO] [stderr]     Checking mime v0.2.6
[INFO] [stderr]     Checking hpack v0.2.0
[INFO] [stderr]     Checking plugin v0.2.6
[INFO] [stderr]    Compiling unicase v1.4.2
[INFO] [stderr]     Checking idna v0.1.5
[INFO] [stderr]     Checking solicit v0.4.4
[INFO] [stderr]     Checking num v0.1.42
[INFO] [stderr]     Checking ordered-float v0.1.0
[INFO] [stderr]     Checking url v1.7.2
[INFO] [stderr]     Checking time v0.1.43
[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 cookie v0.2.5
[INFO] [stderr]     Checking chrono v0.2.25
[INFO] [stderr]     Checking hyper v0.10.16
[INFO] [stderr]     Checking rand v0.3.23
[INFO] [stderr]     Checking serde-value v0.2.1
[INFO] [stderr]     Checking serde_yaml v0.2.5
[INFO] [stderr]     Checking uuid v0.2.3
[INFO] [stderr]     Checking url v0.5.10
[INFO] [stderr]     Checking log4rs v0.4.8
[INFO] [stderr]     Checking hyper v0.8.1
[INFO] [stderr]     Checking mustache v0.9.0
[INFO] [stderr]     Checking nickel v0.11.0
[INFO] [stderr]     Checking copper v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `std::result::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: unused `std::result::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] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 31.34s
[INFO] running `Command { std: "docker" "inspect" "6981b2bade683bd86f8b390346759626ae349ddb054ed9f9032a047101f7a061", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6981b2bade683bd86f8b390346759626ae349ddb054ed9f9032a047101f7a061", kill_on_drop: false }`
[INFO] [stdout] 6981b2bade683bd86f8b390346759626ae349ddb054ed9f9032a047101f7a061