[INFO] updating cached repository https://github.com/ibaryshnikov/runtime-tcp-chat
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] f5ee8116139ee489647b4c524201dc49d8309ccd
[INFO] checking ibaryshnikov/runtime-tcp-chat against try#ea663bba38739867a4b75ac820991b4f5d093c3b for pr-62262-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fibaryshnikov%2Fruntime-tcp-chat" "/workspace/builds/worker-1/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ibaryshnikov/runtime-tcp-chat on toolchain ea663bba38739867a4b75ac820991b4f5d093c3b
[INFO] running `"/workspace/cargo-home/bin/cargo" "+ea663bba38739867a4b75ac820991b4f5d093c3b" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/ibaryshnikov/runtime-tcp-chat
[INFO] finished tweaking git repo https://github.com/ibaryshnikov/runtime-tcp-chat
[INFO] tweaked toml for git repo https://github.com/ibaryshnikov/runtime-tcp-chat written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/ibaryshnikov/runtime-tcp-chat already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+ea663bba38739867a4b75ac820991b4f5d093c3b" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"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" "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" "+ea663bba38739867a4b75ac820991b4f5d093c3b" "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] 98e7c9bdb4095f7cc3a77f6f8c95f894c72ec57057b4527cb9edc244f6aa471f
[INFO] running `"docker" "start" "-a" "98e7c9bdb4095f7cc3a77f6f8c95f894c72ec57057b4527cb9edc244f6aa471f"`
[INFO] [stderr]    Compiling syn v0.15.34
[INFO] [stderr]     Checking futures-core-preview v0.3.0-alpha.16
[INFO] [stderr]     Checking async-datagram v2.2.0
[INFO] [stderr]     Checking async-ready v2.1.0
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]     Checking crossbeam-deque v0.6.3
[INFO] [stderr]     Checking mio-uds v0.6.7
[INFO] [stderr]     Checking rand_isaac v0.1.1
[INFO] [stderr]     Checking rand_xorshift v0.1.1
[INFO] [stderr]     Checking rand_hc v0.1.0
[INFO] [stderr]     Checking rand_chacha v0.1.1
[INFO] [stderr]     Checking futures-channel-preview v0.3.0-alpha.16
[INFO] [stderr]     Checking futures-io-preview v0.3.0-alpha.16
[INFO] [stderr]     Checking rand v0.6.5
[INFO] [stderr]     Checking futures-sink-preview v0.3.0-alpha.16
[INFO] [stderr]     Checking parking_lot_core v0.4.0
[INFO] [stderr]     Checking parking_lot v0.7.1
[INFO] [stderr]     Checking crossbeam v0.6.0
[INFO] [stderr]    Compiling proc-macro-hack v0.5.7
[INFO] [stderr]    Compiling runtime-attributes v0.3.0-alpha.4
[INFO] [stderr]    Compiling futures-select-macro-preview v0.3.0-alpha.16
[INFO] [stderr]     Checking futures-util-preview v0.3.0-alpha.16
[INFO] [stderr]     Checking futures-executor-preview v0.3.0-alpha.16
[INFO] [stderr]     Checking futures-preview v0.3.0-alpha.16
[INFO] [stderr]     Checking juliex v0.3.0-alpha.6
[INFO] [stderr]     Checking romio v0.3.0-alpha.8
[INFO] [stderr]     Checking runtime-raw v0.3.0-alpha.3
[INFO] [stderr]     Checking runtime-native v0.3.0-alpha.3
[INFO] [stderr]     Checking runtime v0.3.0-alpha.4
[INFO] [stderr]     Checking runtime-tcp-chat v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]   --> src/main.rs:71:21
[INFO] [stderr]    |
[INFO] [stderr] 53 | /                     loop {
[INFO] [stderr] 54 | |                         let mut buf = vec![0u8; 1024];
[INFO] [stderr] 55 | |                         reader.read(&mut buf).await.unwrap();
[INFO] [stderr] 56 | |                         println!(
[INFO] [stderr] ...  |
[INFO] [stderr] 69 | |                         join_all(futures).await;
[INFO] [stderr] 70 | |                     }
[INFO] [stderr]    | |_____________________- any code following this expression is unreachable
[INFO] [stderr] 71 |                       Ok(())
[INFO] [stderr]    |                       ^^^^^^ unreachable expression
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]   --> src/main.rs:71:21
[INFO] [stderr]    |
[INFO] [stderr] 53 | /                     loop {
[INFO] [stderr] 54 | |                         let mut buf = vec![0u8; 1024];
[INFO] [stderr] 55 | |                         reader.read(&mut buf).await.unwrap();
[INFO] [stderr] 56 | |                         println!(
[INFO] [stderr] ...  |
[INFO] [stderr] 69 | |                         join_all(futures).await;
[INFO] [stderr] 70 | |                     }
[INFO] [stderr]    | |_____________________- any code following this expression is unreachable
[INFO] [stderr] 71 |                       Ok(())
[INFO] [stderr]    |                       ^^^^^^ unreachable expression
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `async_await` has been stable since 1.39.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:3:12
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![feature(async_await)]
[INFO] [stderr]   |            ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(stable_features)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `async_await` has been stable since 1.39.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:3:12
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![feature(async_await)]
[INFO] [stderr]   |            ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(stable_features)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 41.25s
[INFO] running `"docker" "inspect" "98e7c9bdb4095f7cc3a77f6f8c95f894c72ec57057b4527cb9edc244f6aa471f"`
[INFO] running `"docker" "rm" "-f" "98e7c9bdb4095f7cc3a77f6f8c95f894c72ec57057b4527cb9edc244f6aa471f"`
[INFO] [stdout] 98e7c9bdb4095f7cc3a77f6f8c95f894c72ec57057b4527cb9edc244f6aa471f