[INFO] cloning repository https://github.com/suttung3r/rustechoserver
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/suttung3r/rustechoserver" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsuttung3r%2Frustechoserver", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsuttung3r%2Frustechoserver'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9ca492e70e3d465812bf595b8ea3d864398b4c78
[INFO] checking suttung3r/rustechoserver against master#b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18 for pr-79470
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsuttung3r%2Frustechoserver" "/workspace/builds/worker-1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/suttung3r/rustechoserver on toolchain b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/suttung3r/rustechoserver
[INFO] finished tweaking git repo https://github.com/suttung3r/rustechoserver
[INFO] tweaked toml for git repo https://github.com/suttung3r/rustechoserver written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/suttung3r/rustechoserver already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18" "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] e3bf632ef5d0ee63ab89bbe10ec4d878fa9365ba48e5c7208f2ad2ace83ccc68
[INFO] running `Command { std: "docker" "start" "-a" "e3bf632ef5d0ee63ab89bbe10ec4d878fa9365ba48e5c7208f2ad2ace83ccc68", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e3bf632ef5d0ee63ab89bbe10ec4d878fa9365ba48e5c7208f2ad2ace83ccc68", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e3bf632ef5d0ee63ab89bbe10ec4d878fa9365ba48e5c7208f2ad2ace83ccc68", kill_on_drop: false }`
[INFO] [stdout] e3bf632ef5d0ee63ab89bbe10ec4d878fa9365ba48e5c7208f2ad2ace83ccc68
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18" "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] e48f0b77d2c61d2d72391a98efdf9fd7445999d061949269d690029f8f984cdb
[INFO] running `Command { std: "docker" "start" "-a" "e48f0b77d2c61d2d72391a98efdf9fd7445999d061949269d690029f8f984cdb", kill_on_drop: false }`
[INFO] [stderr]     Checking socket_test v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `res`
[INFO] [stdout]   --> src/main.rs:42:14
[INFO] [stdout]    |
[INFO] [stdout] 42 |           Ok(res) => {}
[INFO] [stdout]    |              ^^^ help: if this is intentional, prefix it with an underscore: `_res`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `res`
[INFO] [stdout]   --> src/main.rs:42:14
[INFO] [stdout]    |
[INFO] [stdout] 42 |           Ok(res) => {}
[INFO] [stdout]    |              ^^^ help: if this is intentional, prefix it with an underscore: `_res`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` 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 [unoptimized + debuginfo] target(s) in 0.34s
[INFO] running `Command { std: "docker" "inspect" "e48f0b77d2c61d2d72391a98efdf9fd7445999d061949269d690029f8f984cdb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e48f0b77d2c61d2d72391a98efdf9fd7445999d061949269d690029f8f984cdb", kill_on_drop: false }`
[INFO] [stdout] e48f0b77d2c61d2d72391a98efdf9fd7445999d061949269d690029f8f984cdb