[INFO] cloning repository https://github.com/yim7/tokio-exercises
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/yim7/tokio-exercises" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyim7%2Ftokio-exercises"`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyim7%2Ftokio-exercises'...
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 6d354dd31904aa835fea9ec62d96151f6f95219c
[INFO] checking yim7/tokio-exercises against try#a243773eaf3fedcd203f10ae4579e4f106bf7ccd for pr-68325
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyim7%2Ftokio-exercises" "/workspace/builds/worker-13/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/yim7/tokio-exercises on toolchain a243773eaf3fedcd203f10ae4579e4f106bf7ccd
[INFO] running `"/workspace/cargo-home/bin/cargo" "+a243773eaf3fedcd203f10ae4579e4f106bf7ccd" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/yim7/tokio-exercises
[INFO] finished tweaking git repo https://github.com/yim7/tokio-exercises
[INFO] tweaked toml for git repo https://github.com/yim7/tokio-exercises written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate git repo https://github.com/yim7/tokio-exercises already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+a243773eaf3fedcd203f10ae4579e4f106bf7ccd" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "+a243773eaf3fedcd203f10ae4579e4f106bf7ccd" "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] c4a104d22e62fdfb5e1e6f070f943d4e1e4c1e6741849bc4cc965d2d4c25a382
[INFO] running `"docker" "start" "-a" "c4a104d22e62fdfb5e1e6f070f943d4e1e4c1e6741849bc4cc965d2d4c25a382"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v1.0.6
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]    Compiling syn v1.0.11
[INFO] [stderr]    Compiling tokio-macros v0.2.0
[INFO] [stderr]     Checking tokio v0.2.4
[INFO] [stderr]     Checking tokio-util v0.2.0
[INFO] [stderr]     Checking tokio-exercises v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `AsyncWriteExt`
[INFO] [stderr]  --> src/bin/exercise1.rs:1:23
[INFO] [stderr]   |
[INFO] [stderr] 1 | use tokio::io::{self, AsyncWriteExt};
[INFO] [stderr]   |                       ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `AsyncWriteExt`
[INFO] [stderr]  --> src/bin/exercise1.rs:1:23
[INFO] [stderr]   |
[INFO] [stderr] 1 | use tokio::io::{self, AsyncWriteExt};
[INFO] [stderr]   |                       ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 41.65s
[INFO] running `"docker" "inspect" "c4a104d22e62fdfb5e1e6f070f943d4e1e4c1e6741849bc4cc965d2d4c25a382"`
[INFO] running `"docker" "rm" "-f" "c4a104d22e62fdfb5e1e6f070f943d4e1e4c1e6741849bc4cc965d2d4c25a382"`
[INFO] [stdout] c4a104d22e62fdfb5e1e6f070f943d4e1e4c1e6741849bc4cc965d2d4c25a382