[INFO] fetching crate crack 0.1.0...
[INFO] testing crack-0.1.0 against beta-2025-09-21 for beta-1.91-3
[INFO] extracting crate crack 0.1.0 into /workspace/builds/worker-2-tc2/source
[INFO] started tweaking crates.io crate crack 0.1.0
[INFO] finished tweaking crates.io crate crack 0.1.0
[INFO] tweaked toml for crates.io crate crack 0.1.0 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate crack 0.1.0 on toolchain beta-2025-09-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 120 packages to latest compatible versions
[INFO] [stderr]       Adding bincode v0.6.1 (available: v2.0.1)
[INFO] [stderr]       Adding bytes v0.4.12 (available: v1.10.1)
[INFO] [stderr]       Adding crdts v1.3.0 (available: v7.3.2)
[INFO] [stderr]       Adding crossbeam v0.2.12 (available: v0.8.4)
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[INFO] [stderr]       Adding futures v0.1.31 (available: v0.3.31)
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[INFO] [stderr]       Adding mio v0.6.23 (available: v1.0.4)
[INFO] [stderr]       Adding quickcheck v0.2.27 (available: v1.0.3)
[INFO] [stderr]       Adding rand v0.3.23 (available: v0.9.2)
[INFO] [stderr]       Adding serde v0.9.15 (available: v1.0.228)
[INFO] [stderr]       Adding serde_derive v0.9.15 (available: v1.0.228)
[INFO] [stderr]       Adding serde_json v0.9.10 (available: v1.0.145)
[INFO] [stderr]       Adding time v0.1.45 (available: v0.3.44)
[INFO] [stderr]       Adding uuid v0.4.0 (available: v1.18.1)
[INFO] [stderr]       Adding wasi v0.10.0+wasi-snapshot-preview1 (available: v0.10.2+wasi-snapshot-preview1)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: no edition set: defaulting to the 2015 edition while the latest is 2024
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 809418a80d82d703bee8df53f911b0d6f6c4685079e04ebab9aeb6e8ecf24a99
[INFO] running `Command { std: "docker" "start" "-a" "809418a80d82d703bee8df53f911b0d6f6c4685079e04ebab9aeb6e8ecf24a99", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "809418a80d82d703bee8df53f911b0d6f6c4685079e04ebab9aeb6e8ecf24a99", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "809418a80d82d703bee8df53f911b0d6f6c4685079e04ebab9aeb6e8ecf24a99", kill_on_drop: false }`
[INFO] [stdout] 809418a80d82d703bee8df53f911b0d6f6c4685079e04ebab9aeb6e8ecf24a99
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b3aea1c32e6583095026f917f3706f5898be6d379d329e93e3533a44376e4b92
[INFO] running `Command { std: "docker" "start" "-a" "b3aea1c32e6583095026f917f3706f5898be6d379d329e93e3533a44376e4b92", kill_on_drop: false }`
[INFO] [stderr] warning: no edition set: defaulting to the 2015 edition while the latest is 2024
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[INFO] [stderr]    Compiling maybe-uninit v2.0.0
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[INFO] [stderr]    Compiling rustc-demangle v0.1.26
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[INFO] [stderr]    Compiling tokio v0.1.22
[INFO] [stderr]    Compiling rand v0.3.23
[INFO] [stderr]    Compiling serde_codegen_internals v0.14.2
[INFO] [stderr]    Compiling addr2line v0.25.1
[INFO] [stderr]    Compiling log v0.3.9
[INFO] [stderr]    Compiling scoped-tls v0.1.2
[INFO] [stderr]    Compiling itoa v0.3.4
[INFO] [stderr]    Compiling serde v0.8.23
[INFO] [stderr]    Compiling dtoa v0.4.8
[INFO] [stderr]    Compiling rustc-serialize v0.3.25
[INFO] [stderr]    Compiling tokio-core v0.1.18
[INFO] [stderr]    Compiling env_logger v0.4.3
[INFO] [stderr]    Compiling serde_derive v0.9.15
[INFO] [stderr]    Compiling serde_derive v1.0.228
[INFO] [stderr]    Compiling uuid v0.4.0
[INFO] [stderr]    Compiling serde_json v0.9.10
[INFO] [stderr]    Compiling time v0.1.45
[INFO] [stderr]    Compiling crossbeam v0.2.12
[INFO] [stderr]    Compiling backtrace v0.3.76
[INFO] [stderr]    Compiling bincode v0.6.1
[INFO] [stderr]    Compiling error-chain v0.9.0
[INFO] [stderr]    Compiling crdts v1.3.0
[INFO] [stderr]    Compiling crack v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: cannot find derive macro `RustcEncodable` in this scope
[INFO] [stdout]    --> src/transport.rs:160:17
[INFO] [stdout]     |
[INFO] [stdout] 160 | #[derive(Debug, RustcEncodable, RustcDecodable)]
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: cannot find derive macro `RustcDecodable` in this scope
[INFO] [stdout]    --> src/transport.rs:160:33
[INFO] [stdout]     |
[INFO] [stdout] 160 | #[derive(Debug, RustcEncodable, RustcDecodable)]
[INFO] [stdout]     |                                 ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #[macro_use]
[INFO] [stdout]   | ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::convert`
[INFO] [stdout]  --> src/transport.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::convert;
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::cell::RefCell`
[INFO] [stdout]  --> src/transport.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::cell::RefCell;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/transport.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::io;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::iter`
[INFO] [stdout]  --> src/transport.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::iter;
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]  --> src/transport.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::rc::Rc;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::str`
[INFO] [stdout]  --> src/transport.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::str;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::marker::PhantomData`
[INFO] [stdout]  --> src/transport.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use std::marker::PhantomData;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Handle`
[INFO] [stdout]   --> src/transport.rs:17:33
[INFO] [stdout]    |
[INFO] [stdout] 17 | use tokio_core::reactor::{Core, Handle};
[INFO] [stdout]    |                                 ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `DecodingResult`
[INFO] [stdout]   --> src/transport.rs:20:48
[INFO] [stdout]    |
[INFO] [stdout] 20 | use bincode::rustc_serialize::{encode, decode, DecodingResult};
[INFO] [stdout]    |                                                ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `serde_json`
[INFO] [stdout]   --> src/transport.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | use serde_json;
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `BufMut` and `BytesMut`
[INFO] [stdout]   --> src/transport.rs:22:13
[INFO] [stdout]    |
[INFO] [stdout] 22 | use bytes::{BufMut, BytesMut};
[INFO] [stdout]    |             ^^^^^^  ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Decoder` and `Encoder`
[INFO] [stdout]   --> src/transport.rs:23:23
[INFO] [stdout]    |
[INFO] [stdout] 23 | use tokio_io::codec::{Encoder, Decoder, length_delimited};
[INFO] [stdout]    |                       ^^^^^^^  ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tokio_io::AsyncRead`
[INFO] [stdout]   --> src/transport.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 | use tokio_io::AsyncRead;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `future` and `sink`
[INFO] [stdout]   --> src/transport.rs:25:15
[INFO] [stdout]    |
[INFO] [stdout] 25 | use futures::{future, sink, Sink, Stream, Future, IntoFuture};
[INFO] [stdout]    |               ^^^^^^  ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `SplitSink`, `SplitStream`, and `self`
[INFO] [stdout]   --> src/transport.rs:26:23
[INFO] [stdout]    |
[INFO] [stdout] 26 | use futures::stream::{self, SplitSink, SplitStream};
[INFO] [stdout]    |                       ^^^^  ^^^^^^^^^  ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `uuid::Uuid`
[INFO] [stdout]   --> src/transport.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 27 | use uuid::Uuid;
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `from_binary` and `to_binary`
[INFO] [stdout]   --> src/transport.rs:29:6
[INFO] [stdout]    |
[INFO] [stdout] 29 | use {to_binary, from_binary};
[INFO] [stdout]    |      ^^^^^^^^^  ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `kernel::Peer`
[INFO] [stdout]   --> src/transport.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 30 | use kernel::Peer;
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]   --> src/kernel.rs:13:20
[INFO] [stdout]    |
[INFO] [stdout] 13 |     fn ping(&self, Peer) -> Result<(), ()>;
[INFO] [stdout]    |                    ^^^^ help: try naming the parameter or explicitly ignoring it: `_: Peer`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout]    = note: `#[warn(anonymous_parameters)]` (part of `#[warn(rust_2018_compatibility)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]   --> src/kernel.rs:14:21
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn purge(&self, Peer);
[INFO] [stdout]    |                     ^^^^ help: try naming the parameter or explicitly ignoring it: `_: Peer`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `crc16_arr` and `crc16`
[INFO] [stdout]   --> src/lib.rs:29:13
[INFO] [stdout]    |
[INFO] [stdout] 29 | use crc16::{crc16_arr, crc16};
[INFO] [stdout]    |             ^^^^^^^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated module `tokio_io::codec::length_delimited`: Moved to tokio-codec
[INFO] [stdout]   --> src/transport.rs:23:41
[INFO] [stdout]    |
[INFO] [stdout] 23 | use tokio_io::codec::{Encoder, Decoder, length_delimited};
[INFO] [stdout]    |                                         ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated struct `tokio_io::length_delimited::FramedRead`: Moved to tokio-codec
[INFO] [stdout]    --> src/transport.rs:108:46
[INFO] [stdout]     |
[INFO] [stdout] 108 |             let deframed = length_delimited::FramedRead::new(socket);
[INFO] [stdout]     |                                              ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated struct `tokio_io::length_delimited::FramedWrite`: Moved to tokio-codec
[INFO] [stdout]    --> src/transport.rs:143:44
[INFO] [stdout]     |
[INFO] [stdout] 143 |             let framed = length_delimited::FramedWrite::new(socket);
[INFO] [stdout]     |                                            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/model.rs:62:48
[INFO] [stdout]    |
[INFO] [stdout] 62 | pub struct Process<A>(Vec<(Option<String>, Box<Fn(A) -> A>)>);
[INFO] [stdout]    |                                                ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` (part of `#[warn(rust_2021_compatibility)]`) on by default
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 62 | pub struct Process<A>(Vec<(Option<String>, Box<dyn Fn(A) -> A>)>);
[INFO] [stdout]    |                                                +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/model.rs:72:29
[INFO] [stdout]    |
[INFO] [stdout] 72 |     pub invariants: Vec<Box<Fn(&A) -> bool>>,
[INFO] [stdout]    |                             ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 72 |     pub invariants: Vec<Box<dyn Fn(&A) -> bool>>,
[INFO] [stdout]    |                             +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/model.rs:73:49
[INFO] [stdout]    |
[INFO] [stdout] 73 |     pub processes: Vec<Vec<(Option<String>, Box<Fn(A) -> A>)>>,
[INFO] [stdout]    |                                                 ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 73 |     pub processes: Vec<Vec<(Option<String>, Box<dyn Fn(A) -> A>)>>,
[INFO] [stdout]    |                                                 +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/model.rs:65:41
[INFO] [stdout]    |
[INFO] [stdout] 65 |     fn new<'a>(steps: Vec<(&'a str, Box<Fn(A) -> A>)>) -> Process<A> {
[INFO] [stdout]    |                                         ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 65 |     fn new<'a>(steps: Vec<(&'a str, Box<dyn Fn(A) -> A>)>) -> Process<A> {
[INFO] [stdout]    |                                         +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `futures::sync::mpsc::UnboundedSender::<T>::send`: renamed to `unbounded_send`
[INFO] [stdout]   --> src/transport.rs:61:24
[INFO] [stdout]    |
[INFO] [stdout] 61 |                     tx.send(msg).unwrap();
[INFO] [stdout]    |                        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `peer`
[INFO] [stdout]   --> src/kernel.rs:38:20
[INFO] [stdout]    |
[INFO] [stdout] 38 |     fn ping(&self, peer: Peer) -> Result<(), ()> {
[INFO] [stdout]    |                    ^^^^ help: if this is intentional, prefix it with an underscore: `_peer`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `peer`
[INFO] [stdout]   --> src/kernel.rs:42:21
[INFO] [stdout]    |
[INFO] [stdout] 42 |     fn purge(&self, peer: Peer) {}
[INFO] [stdout]    |                     ^^^^ help: if this is intentional, prefix it with an underscore: `_peer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `note`
[INFO] [stdout]   --> src/model.rs:84:26
[INFO] [stdout]    |
[INFO] [stdout] 84 |                 let (ref note, ref f) = self.processes[choice][*index];
[INFO] [stdout]    |                          ^^^^ help: if this is intentional, prefix it with an underscore: `_note`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `crack` (lib) due to 2 previous errors; 33 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "b3aea1c32e6583095026f917f3706f5898be6d379d329e93e3533a44376e4b92", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b3aea1c32e6583095026f917f3706f5898be6d379d329e93e3533a44376e4b92", kill_on_drop: false }`
[INFO] [stdout] b3aea1c32e6583095026f917f3706f5898be6d379d329e93e3533a44376e4b92
