[INFO] cloning repository https://github.com/jkarneges/rust-async-bench
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jkarneges/rust-async-bench" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjkarneges%2Frust-async-bench", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjkarneges%2Frust-async-bench'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4eb53c828ae6488a22cf04ec7c0fa0ccab0b03fd
[INFO] checking jkarneges/rust-async-bench against try#07fecb9cf34c4979a772ba38c99d6d9144768413 for pr-87710
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjkarneges%2Frust-async-bench" "/workspace/builds/worker-10/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-10/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jkarneges/rust-async-bench on toolchain 07fecb9cf34c4979a772ba38c99d6d9144768413
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+07fecb9cf34c4979a772ba38c99d6d9144768413" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/jkarneges/rust-async-bench
[INFO] finished tweaking git repo https://github.com/jkarneges/rust-async-bench
[INFO] tweaked toml for git repo https://github.com/jkarneges/rust-async-bench written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] crate git repo https://github.com/jkarneges/rust-async-bench already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+07fecb9cf34c4979a772ba38c99d6d9144768413" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded oorandom v11.1.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+07fecb9cf34c4979a772ba38c99d6d9144768413" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 74260c9fa021a4700fdad3c6291b9a33aef6fcbce431daf73a10572b66a8be7a
[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" "74260c9fa021a4700fdad3c6291b9a33aef6fcbce431daf73a10572b66a8be7a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "74260c9fa021a4700fdad3c6291b9a33aef6fcbce431daf73a10572b66a8be7a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "74260c9fa021a4700fdad3c6291b9a33aef6fcbce431daf73a10572b66a8be7a", kill_on_drop: false }`
[INFO] [stdout] 74260c9fa021a4700fdad3c6291b9a33aef6fcbce431daf73a10572b66a8be7a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+07fecb9cf34c4979a772ba38c99d6d9144768413" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 304d2b199973d4958c3f06e91d8c934d7962f21e5ea86501256003467dc25820
[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" "304d2b199973d4958c3f06e91d8c934d7962f21e5ea86501256003467dc25820", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.116
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]    Compiling proc-macro2 v1.0.21
[INFO] [stderr]    Compiling syn v1.0.40
[INFO] [stderr]    Compiling serde_json v1.0.57
[INFO] [stderr]     Checking itoa v0.4.6
[INFO] [stderr]     Checking same-file v1.0.6
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling memoffset v0.5.5
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.2
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling rayon v1.4.0
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking rust-async-bench v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling cast v0.2.3
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stderr]     Checking walkdir v2.3.1
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/fakeio.rs:172:13
[INFO] [stdout]     |
[INFO] [stdout] 172 |             &mut buf[..data.len()].copy_from_slice(&data);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 172 |             let _ = &mut buf[..data.len()].copy_from_slice(&data);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0391]: cycle detected when optimizing MIR for `run::listen::{closure#0}`
[INFO] [stdout]    --> src/run.rs:167:28
[INFO] [stdout]     |
[INFO] [stdout] 167 |   ) -> Result<(), io::Error> {
[INFO] [stdout]     |  ____________________________^
[INFO] [stdout] 168 | |     let listener = AsyncFakeListener::new(reactor, stats);
[INFO] [stdout] 169 | |
[INFO] [stdout] 170 | |     for _ in 0..CONNS_MAX {
[INFO] [stdout] ...   |
[INFO] [stdout] 180 | |     Ok(())
[INFO] [stdout] 181 | | }
[INFO] [stdout]     | |_^
[INFO] [stdout]     |
[INFO] [stdout]     = note: ...which requires computing layout of `std::future::from_generator::GenFuture<[static generator@src/run.rs:213:3: 218:2]>`...
[INFO] [stdout]     = note: ...which requires computing layout of `[static generator@src/run.rs:213:3: 218:2]`...
[INFO] [stdout] note: ...which requires optimizing MIR for `run::do_async::{closure#0}`...
[INFO] [stdout]    --> src/run.rs:213:3
[INFO] [stdout]     |
[INFO] [stdout] 213 |   ) {
[INFO] [stdout]     |  ___^
[INFO] [stdout] 214 | |     match invoke {
[INFO] [stdout] 215 | |         AsyncInvoke::Listen => listen(spawn, ctx, reactor, stats).await.unwrap(),
[INFO] [stdout] 216 | |         AsyncInvoke::Connection(stream) => connection(stream).await.unwrap(),
[INFO] [stdout] 217 | |     }
[INFO] [stdout] 218 | | }
[INFO] [stdout]     | |_^
[INFO] [stdout]     = note: ...which requires computing layout of `std::future::from_generator::GenFuture<[static generator@src/run.rs:167:28: 181:2]>`...
[INFO] [stdout]     = note: ...which requires computing layout of `[static generator@src/run.rs:167:28: 181:2]`...
[INFO] [stdout]     = note: ...which again requires optimizing MIR for `run::listen::{closure#0}`, completing the cycle
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0391`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust-async-bench` due to 2 previous errors; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "304d2b199973d4958c3f06e91d8c934d7962f21e5ea86501256003467dc25820", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "304d2b199973d4958c3f06e91d8c934d7962f21e5ea86501256003467dc25820", kill_on_drop: false }`
[INFO] [stdout] 304d2b199973d4958c3f06e91d8c934d7962f21e5ea86501256003467dc25820