[INFO] fetching crate mio-utun 0.6.19...
[INFO] checking mio-utun-0.6.19 against master#2748a9fd93dd1a00a4521f4f16de5befbf77f6cd for pr-62262-1
[INFO] extracting crate mio-utun 0.6.19 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate mio-utun 0.6.19 on toolchain 2748a9fd93dd1a00a4521f4f16de5befbf77f6cd
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "read-manifest" "--manifest-path" "Cargo.toml"`
[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-5/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "/opt/rustwide/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] f70681e71933a916540f713176667205a08f31ca2235ea42c33609011cbdc8b3
[INFO] running `"docker" "start" "-a" "f70681e71933a916540f713176667205a08f31ca2235ea42c33609011cbdc8b3"`
[INFO] [stderr]    Compiling nix v0.10.0
[INFO] [stderr]     Checking mio-utun v0.6.19 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `Write`
[INFO] [stderr]  --> tests/echo.rs:4:21
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::io::{self, Write, Read};
[INFO] [stderr]   |                     ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::ErrorKind::WouldBlock`
[INFO] [stderr]  --> tests/echo.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::io::ErrorKind::WouldBlock;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused macro definition
[INFO] [stderr]   --> tests/echo.rs:10:1
[INFO] [stderr]    |
[INFO] [stderr] 10 | / macro_rules! t {
[INFO] [stderr] 11 | |     ($e:expr) => (match $e {
[INFO] [stderr] 12 | |         Ok(e) => e,
[INFO] [stderr] 13 | |         Err(e) => panic!("{} failed with {}", stringify!($e), e),
[INFO] [stderr] 14 | |     })
[INFO] [stderr] 15 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_macros)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `SERVER`
[INFO] [stderr]   --> tests/echo.rs:19:5
[INFO] [stderr]    |
[INFO] [stderr] 19 |     const SERVER: Token = Token(0);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.33s
[INFO] running `"docker" "inspect" "f70681e71933a916540f713176667205a08f31ca2235ea42c33609011cbdc8b3"`
[INFO] running `"docker" "rm" "-f" "f70681e71933a916540f713176667205a08f31ca2235ea42c33609011cbdc8b3"`
[INFO] [stdout] f70681e71933a916540f713176667205a08f31ca2235ea42c33609011cbdc8b3