[INFO] fetching crate mio-utun 0.6.19...
[INFO] checking mio-utun-0.6.19 against master#a5f164faad4a2fed606b8160fd7ecd2d5cbba381 for pr-84920
[INFO] extracting crate mio-utun 0.6.19 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate mio-utun 0.6.19 on toolchain a5f164faad4a2fed606b8160fd7ecd2d5cbba381
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate mio-utun 0.6.19
[INFO] finished tweaking crates.io crate mio-utun 0.6.19
[INFO] tweaked toml for crates.io crate mio-utun 0.6.19 written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5bd4de530a55b1b15e05284f8b1cb260d72ae65a19159d6c856abf95cabb495f
[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" "5bd4de530a55b1b15e05284f8b1cb260d72ae65a19159d6c856abf95cabb495f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5bd4de530a55b1b15e05284f8b1cb260d72ae65a19159d6c856abf95cabb495f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5bd4de530a55b1b15e05284f8b1cb260d72ae65a19159d6c856abf95cabb495f", kill_on_drop: false }`
[INFO] [stdout] 5bd4de530a55b1b15e05284f8b1cb260d72ae65a19159d6c856abf95cabb495f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "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] 23fe2cb2459a44c3196c4413813b24ef543adcfac800cce0bb65ac97c6d35bbc
[INFO] running `Command { std: "docker" "start" "-a" "23fe2cb2459a44c3196c4413813b24ef543adcfac800cce0bb65ac97c6d35bbc", kill_on_drop: false }`
[INFO] [stderr]    Compiling nix v0.10.0
[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]     Checking mio v0.6.23
[INFO] [stderr]     Checking mio-utun v0.6.19 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `Write`
[INFO] [stdout]  --> tests/echo.rs:4:21
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::io::{self, Write, Read};
[INFO] [stdout]   |                     ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::ErrorKind::WouldBlock`
[INFO] [stdout]  --> tests/echo.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::io::ErrorKind::WouldBlock;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition
[INFO] [stdout]   --> tests/echo.rs:10:1
[INFO] [stdout]    |
[INFO] [stdout] 10 | / macro_rules! t {
[INFO] [stdout] 11 | |     ($e:expr) => (match $e {
[INFO] [stdout] 12 | |         Ok(e) => e,
[INFO] [stdout] 13 | |         Err(e) => panic!("{} failed with {}", stringify!($e), e),
[INFO] [stdout] 14 | |     })
[INFO] [stdout] 15 | | }
[INFO] [stdout]    | |_^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_macros)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `SERVER`
[INFO] [stdout]   --> tests/echo.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     const SERVER: Token = Token(0);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.21s
[INFO] running `Command { std: "docker" "inspect" "23fe2cb2459a44c3196c4413813b24ef543adcfac800cce0bb65ac97c6d35bbc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "23fe2cb2459a44c3196c4413813b24ef543adcfac800cce0bb65ac97c6d35bbc", kill_on_drop: false }`
[INFO] [stdout] 23fe2cb2459a44c3196c4413813b24ef543adcfac800cce0bb65ac97c6d35bbc