[INFO] fetching crate par-dfs 0.0.7...
[INFO] checking par-dfs-0.0.7 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate par-dfs 0.0.7 into /workspace/builds/worker-2-tc2/source
[INFO] started tweaking crates.io crate par-dfs 0.0.7
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate par-dfs 0.0.7
[INFO] tweaked toml for crates.io crate par-dfs 0.0.7 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate par-dfs 0.0.7 on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate par-dfs 0.0.7 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8b0bc5ceb7ea9e9bb04b3366ff54ef0885b694d86cc0489bc7afa514fcd6307d
[INFO] running `Command { std: "docker" "start" "-a" "8b0bc5ceb7ea9e9bb04b3366ff54ef0885b694d86cc0489bc7afa514fcd6307d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8b0bc5ceb7ea9e9bb04b3366ff54ef0885b694d86cc0489bc7afa514fcd6307d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8b0bc5ceb7ea9e9bb04b3366ff54ef0885b694d86cc0489bc7afa514fcd6307d", kill_on_drop: false }`
[INFO] [stdout] 8b0bc5ceb7ea9e9bb04b3366ff54ef0885b694d86cc0489bc7afa514fcd6307d
[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=forbid -Dunmustuse_in_always_ok" "-e" "RUSTDOCFLAGS=--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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a9ab7298029814b8f04e3ed57ec2ab1f58479fe64a056f2f0c40d812bc75d7ba
[INFO] running `Command { std: "docker" "start" "-a" "a9ab7298029814b8f04e3ed57ec2ab1f58479fe64a056f2f0c40d812bc75d7ba", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.43
[INFO] [stderr]    Compiling unicode-ident v1.0.3
[INFO] [stderr]    Compiling syn v1.0.99
[INFO] [stderr]    Compiling libc v0.2.132
[INFO] [stderr]     Checking once_cell v1.14.0
[INFO] [stderr]    Compiling futures-core v0.3.24
[INFO] [stderr]    Compiling crossbeam-utils v0.8.11
[INFO] [stderr]    Compiling serde_derive v1.0.144
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.10
[INFO] [stderr]    Compiling serde v1.0.144
[INFO] [stderr]    Compiling tokio v1.21.1
[INFO] [stderr]    Compiling futures-task v0.3.24
[INFO] [stderr]    Compiling rayon-core v1.9.3
[INFO] [stderr]    Compiling futures-channel v0.3.24
[INFO] [stderr]    Compiling serde_json v1.0.85
[INFO] [stderr]     Checking futures-sink v0.3.24
[INFO] [stderr]    Compiling futures-util v0.3.24
[INFO] [stderr]     Checking either v1.8.0
[INFO] [stderr]    Compiling rayon v1.5.3
[INFO] [stderr]     Checking ryu v1.0.11
[INFO] [stderr]     Checking itoa v1.0.3
[INFO] [stderr]     Checking ciborium-io v0.2.0
[INFO] [stderr]     Checking clap_lex v0.2.4
[INFO] [stderr]     Checking textwrap v0.15.0
[INFO] [stderr]     Checking regex-syntax v0.6.27
[INFO] [stderr]     Checking ciborium-ll v0.2.0
[INFO] [stderr]     Checking itertools v0.10.3
[INFO] [stderr]    Compiling anyhow v1.0.64
[INFO] [stderr]     Checking futures-io v0.3.24
[INFO] [stderr]     Checking plotters v0.3.4
[INFO] [stderr]     Checking yansi v0.5.1
[INFO] [stderr]     Checking diff v0.1.13
[INFO] [stderr]    Compiling paste v1.0.9
[INFO] [stderr]     Checking pretty_assertions v1.3.0
[INFO] [stderr]     Checking crossbeam-channel v0.5.6
[INFO] [stderr]     Checking num_cpus v1.13.1
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]    Compiling quote v1.0.21
[INFO] [stderr]     Checking crossbeam-deque v0.8.2
[INFO] [stderr]     Checking regex v1.6.0
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]     Checking criterion-plot v0.5.0
[INFO] [stderr]     Checking futures v0.3.24
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling tokio-macros v1.8.0
[INFO] [stderr]    Compiling thiserror-impl v1.0.34
[INFO] [stderr]    Compiling async-stream-impl v0.3.3
[INFO] [stderr]    Compiling clap_derive v3.2.18
[INFO] [stderr]     Checking async-stream v0.3.3
[INFO] [stderr]     Checking thiserror v1.0.34
[INFO] [stderr]     Checking par-dfs v0.0.7 (/opt/rustwide/workdir)
[INFO] [stdout] warning: methods `len`, `is_empty`, and `split_off` are never used
[INFO] [stdout]   --> src/sync/mod.rs:36:8
[INFO] [stdout]    |
[INFO] [stdout] 34 | pub(crate) trait Queue<I, E> {
[INFO] [stdout]    |                  ----- methods in this trait
[INFO] [stdout] 35 |     /// Returns the number of items in the queue
[INFO] [stdout] 36 |     fn len(&self) -> usize;
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 39 |     fn is_empty(&self) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 65 |     fn split_off(&mut self, at: usize) -> Self;
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking clap v3.2.21
[INFO] [stderr]     Checking tokio-stream v0.1.9
[INFO] [stderr]     Checking tokio-test v0.4.2
[INFO] [stderr]     Checking ciborium v0.2.0
[INFO] [stderr]     Checking tinytemplate v1.2.1
[INFO] [stderr]     Checking criterion v0.4.0
[INFO] [stdout] error: this type will no longer be must used: Result<PathBuf, Infallible>
[INFO] [stdout]   --> examples/sync/fs.rs:81:9
[INFO] [stdout]    |
[INFO] [stdout] 81 |         path: PathBuf,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `par-dfs` (example "sync_fs") due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused import: `sync_collatz::*`
[INFO] [stdout]    --> benches/benches.rs:198:9
[INFO] [stdout]     |
[INFO] [stdout] 198 | pub use sync_collatz::*;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<u32, Infallible>
[INFO] [stdout]   --> benches/benches.rs:34:44
[INFO] [stdout]    |
[INFO] [stdout] 34 |                 queue: VecDeque::from_iter([(0, Ok(start))]),
[INFO] [stdout]    |                                            ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<u32, Infallible>
[INFO] [stdout]   --> benches/benches.rs:34:49
[INFO] [stdout]    |
[INFO] [stdout] 34 |                 queue: VecDeque::from_iter([(0, Ok(start))]),
[INFO] [stdout]    |                                                 ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<u32, Infallible>
[INFO] [stdout]   --> benches/benches.rs:50:41
[INFO] [stdout]    |
[INFO] [stdout] 50 | ...                   return Some(Ok(n));
[INFO] [stdout]    |                                   ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<u32, Infallible>
[INFO] [stdout]   --> benches/benches.rs:57:58
[INFO] [stdout]    |
[INFO] [stdout] 57 | ...                   self.queue.push_back((depth, Ok(even)));
[INFO] [stdout]    |                                                    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<u32, Infallible>
[INFO] [stdout]   --> benches/benches.rs:65:58
[INFO] [stdout]    |
[INFO] [stdout] 65 | ...                   self.queue.push_back((depth, Ok(odd)));
[INFO] [stdout]    |                                                    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<u32, Infallible>
[INFO] [stdout]   --> benches/benches.rs:68:26
[INFO] [stdout]    |
[INFO] [stdout] 68 |                     Some(Ok(n))
[INFO] [stdout]    |                          ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<u32, Infallible>
[INFO] [stdout]   --> benches/benches.rs:70:38
[INFO] [stdout]    |
[INFO] [stdout] 70 |                 Some((_, n)) => Some(n),
[INFO] [stdout]    |                                      ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<CollatzNode, Infallible>
[INFO] [stdout]    --> benches/benches.rs:176:27
[INFO] [stdout]     |
[INFO] [stdout] 176 |                 queue.add(Ok(Self(even)));
[INFO] [stdout]     |                           ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<CollatzNode, Infallible>
[INFO] [stdout]    --> benches/benches.rs:181:27
[INFO] [stdout]     |
[INFO] [stdout] 181 |                 queue.add(Ok(Self((n - 1) / 3)));
[INFO] [stdout]     |                           ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this type continue be must used: Result<Box<dyn Iterator<Item = Result<CollatzNode, Infallible>>>, Infallible>
[INFO] [stdout]    --> benches/benches.rs:191:74
[INFO] [stdout]     |
[INFO] [stdout] 191 |           fn children(&self, _depth: usize) -> NodeIter<Self, Self::Error> {
[INFO] [stdout]     |  __________________________________________________________________________^
[INFO] [stdout] 192 | |             Ok(Box::new(self.collatz_children()))
[INFO] [stdout] 193 | |         }
[INFO] [stdout]     | |_________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(mustuse_in_always_ok)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this type continue be must used: Result<Box<dyn Iterator<Item = Result<CollatzNode, Infallible>>>, Infallible>
[INFO] [stdout]    --> benches/benches.rs:192:13
[INFO] [stdout]     |
[INFO] [stdout] 192 |             Ok(Box::new(self.collatz_children()))
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `par-dfs` (bench "benches") due to 9 previous errors; 3 warnings emitted
[INFO] [stdout] warning: methods `len`, `is_empty`, and `split_off` are never used
[INFO] [stdout]   --> src/sync/mod.rs:36:8
[INFO] [stdout]    |
[INFO] [stdout] 34 | pub(crate) trait Queue<I, E> {
[INFO] [stdout]    |                  ----- methods in this trait
[INFO] [stdout] 35 |     /// Returns the number of items in the queue
[INFO] [stdout] 36 |     fn len(&self) -> usize;
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 39 |     fn is_empty(&self) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 65 |     fn split_off(&mut self, at: usize) -> Self;
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "a9ab7298029814b8f04e3ed57ec2ab1f58479fe64a056f2f0c40d812bc75d7ba", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a9ab7298029814b8f04e3ed57ec2ab1f58479fe64a056f2f0c40d812bc75d7ba", kill_on_drop: false }`
[INFO] [stdout] a9ab7298029814b8f04e3ed57ec2ab1f58479fe64a056f2f0c40d812bc75d7ba
