[INFO] fetching crate turbulence 0.3.0...
[INFO] checking turbulence-0.3.0 against master#0a8629bff642c3c3b84bb644c0099194f063b627 for pr-86231
[INFO] extracting crate turbulence 0.3.0 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate turbulence 0.3.0 on toolchain 0a8629bff642c3c3b84bb644c0099194f063b627
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0a8629bff642c3c3b84bb644c0099194f063b627" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate turbulence 0.3.0
[INFO] finished tweaking crates.io crate turbulence 0.3.0
[INFO] tweaked toml for crates.io crate turbulence 0.3.0 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0a8629bff642c3c3b84bb644c0099194f063b627" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0a8629bff642c3c3b84bb644c0099194f063b627" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "+0a8629bff642c3c3b84bb644c0099194f063b627" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 75efbec2d8f930a7103db14c5d996fc89a8745f8ed32f39334548f3ff8aaf31d
[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" "75efbec2d8f930a7103db14c5d996fc89a8745f8ed32f39334548f3ff8aaf31d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "75efbec2d8f930a7103db14c5d996fc89a8745f8ed32f39334548f3ff8aaf31d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "75efbec2d8f930a7103db14c5d996fc89a8745f8ed32f39334548f3ff8aaf31d", kill_on_drop: false }`
[INFO] [stdout] 75efbec2d8f930a7103db14c5d996fc89a8745f8ed32f39334548f3ff8aaf31d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "+0a8629bff642c3c3b84bb644c0099194f063b627" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bdb25c41a12a376eb930e9609c11a8f7f5d4bf3fe961283667b7006d8d52613a
[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" "bdb25c41a12a376eb930e9609c11a8f7f5d4bf3fe961283667b7006d8d52613a", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.97
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]    Compiling snap v1.0.5
[INFO] [stderr]     Checking ppv-lite86 v0.2.10
[INFO] [stderr]    Compiling syn v1.0.73
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_pcg v0.2.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]    Compiling futures-macro v0.3.15
[INFO] [stderr]    Compiling serde_derive v1.0.126
[INFO] [stderr]    Compiling thiserror-impl v1.0.25
[INFO] [stderr]     Checking futures-util v0.3.15
[INFO] [stderr]     Checking thiserror v1.0.25
[INFO] [stderr]     Checking futures-executor v0.3.15
[INFO] [stderr]     Checking futures v0.3.15
[INFO] [stderr]     Checking serde v1.0.126
[INFO] [stderr]     Checking bincode v1.3.3
[INFO] [stderr]     Checking turbulence v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `flush`
[INFO] [stdout]    --> src/message_channels.rs:477:29
[INFO] [stdout]     |
[INFO] [stdout] 477 | ...                   flush = flush_receiver.wait().fuse() => Next::Flush,
[INFO] [stdout]     |                       ^^^^^ help: if this is intentional, prefix it with an underscore: `_flush`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `flush`
[INFO] [stdout]    --> src/message_channels.rs:523:29
[INFO] [stdout]     |
[INFO] [stdout] 523 | ...                   flush = flush_receiver.wait().fuse() => Next::Flush,
[INFO] [stdout]     |                       ^^^^^ help: if this is intentional, prefix it with an underscore: `_flush`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `flush`
[INFO] [stdout]    --> src/message_channels.rs:569:29
[INFO] [stdout]     |
[INFO] [stdout] 569 | ...                   flush = flush_receiver.wait().fuse() => Next::Flush,
[INFO] [stdout]     |                       ^^^^^ help: if this is intentional, prefix it with an underscore: `_flush`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> src/message_channels.rs:266:61
[INFO] [stdout]     |
[INFO] [stdout] 266 |             TryAsyncMessageError::Unregistered(e) => panic!(e),
[INFO] [stdout]     |                                                             ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_fmt_panic)]` on by default
[INFO] [stdout]     = note: this is no longer accepted in Rust 2021
[INFO] [stdout] help: add a "{}" format string to Display the message
[INFO] [stdout]     |
[INFO] [stdout] 266 |             TryAsyncMessageError::Unregistered(e) => panic!("{}", e),
[INFO] [stdout]     |                                                             ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]     |
[INFO] [stdout] 266 |             TryAsyncMessageError::Unregistered(e) => std::panic::panic_any(e),
[INFO] [stdout]     |                                                      ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> src/message_channels.rs:352:61
[INFO] [stdout]     |
[INFO] [stdout] 352 |             TryAsyncMessageError::Unregistered(e) => panic!(e),
[INFO] [stdout]     |                                                             ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this is no longer accepted in Rust 2021
[INFO] [stdout] help: add a "{}" format string to Display the message
[INFO] [stdout]     |
[INFO] [stdout] 352 |             TryAsyncMessageError::Unregistered(e) => panic!("{}", e),
[INFO] [stdout]     |                                                             ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]     |
[INFO] [stdout] 352 |             TryAsyncMessageError::Unregistered(e) => std::panic::panic_any(e),
[INFO] [stdout]     |                                                      ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `flush`
[INFO] [stdout]    --> src/message_channels.rs:477:29
[INFO] [stdout]     |
[INFO] [stdout] 477 | ...                   flush = flush_receiver.wait().fuse() => Next::Flush,
[INFO] [stdout]     |                       ^^^^^ help: if this is intentional, prefix it with an underscore: `_flush`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `flush`
[INFO] [stdout]    --> src/message_channels.rs:523:29
[INFO] [stdout]     |
[INFO] [stdout] 523 | ...                   flush = flush_receiver.wait().fuse() => Next::Flush,
[INFO] [stdout]     |                       ^^^^^ help: if this is intentional, prefix it with an underscore: `_flush`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `flush`
[INFO] [stdout]    --> src/message_channels.rs:569:29
[INFO] [stdout]     |
[INFO] [stdout] 569 | ...                   flush = flush_receiver.wait().fuse() => Next::Flush,
[INFO] [stdout]     |                       ^^^^^ help: if this is intentional, prefix it with an underscore: `_flush`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> src/message_channels.rs:266:61
[INFO] [stdout]     |
[INFO] [stdout] 266 |             TryAsyncMessageError::Unregistered(e) => panic!(e),
[INFO] [stdout]     |                                                             ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_fmt_panic)]` on by default
[INFO] [stdout]     = note: this is no longer accepted in Rust 2021
[INFO] [stdout] help: add a "{}" format string to Display the message
[INFO] [stdout]     |
[INFO] [stdout] 266 |             TryAsyncMessageError::Unregistered(e) => panic!("{}", e),
[INFO] [stdout]     |                                                             ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]     |
[INFO] [stdout] 266 |             TryAsyncMessageError::Unregistered(e) => std::panic::panic_any(e),
[INFO] [stdout]     |                                                      ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> src/message_channels.rs:352:61
[INFO] [stdout]     |
[INFO] [stdout] 352 |             TryAsyncMessageError::Unregistered(e) => panic!(e),
[INFO] [stdout]     |                                                             ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this is no longer accepted in Rust 2021
[INFO] [stdout] help: add a "{}" format string to Display the message
[INFO] [stdout]     |
[INFO] [stdout] 352 |             TryAsyncMessageError::Unregistered(e) => panic!("{}", e),
[INFO] [stdout]     |                                                             ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]     |
[INFO] [stdout] 352 |             TryAsyncMessageError::Unregistered(e) => std::panic::panic_any(e),
[INFO] [stdout]     |                                                      ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 27.18s
[INFO] running `Command { std: "docker" "inspect" "bdb25c41a12a376eb930e9609c11a8f7f5d4bf3fe961283667b7006d8d52613a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bdb25c41a12a376eb930e9609c11a8f7f5d4bf3fe961283667b7006d8d52613a", kill_on_drop: false }`
[INFO] [stdout] bdb25c41a12a376eb930e9609c11a8f7f5d4bf3fe961283667b7006d8d52613a