[INFO] fetching crate fast-list 0.1.8...
[INFO] testing fast-list-0.1.8 against try#c2e32f1c9652b13ed99608599c1e855462f421f3 for pr-146098-7
[INFO] extracting crate fast-list 0.1.8 into /workspace/builds/worker-0-tc2/source
[INFO] started tweaking crates.io crate fast-list 0.1.8
[INFO] finished tweaking crates.io crate fast-list 0.1.8
[INFO] tweaked toml for crates.io crate fast-list 0.1.8 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate fast-list 0.1.8 on toolchain c2e32f1c9652b13ed99608599c1e855462f421f3
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c2e32f1c9652b13ed99608599c1e855462f421f3" "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" "+c2e32f1c9652b13ed99608599c1e855462f421f3" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 83 packages to latest compatible versions
[INFO] [stderr]       Adding criterion v0.5.1 (available: v0.7.0)
[INFO] [stderr]       Adding hashbrown v0.14.5 (available: v0.16.0)
[INFO] [stderr]       Adding thiserror v1.0.69 (available: v2.0.17)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c2e32f1c9652b13ed99608599c1e855462f421f3" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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" "+c2e32f1c9652b13ed99608599c1e855462f421f3" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 77b3394a0999507d050c98b27f354c6e4809cc6221e0228f360a5373f2412040
[INFO] running `Command { std: "docker" "start" "-a" "77b3394a0999507d050c98b27f354c6e4809cc6221e0228f360a5373f2412040", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "77b3394a0999507d050c98b27f354c6e4809cc6221e0228f360a5373f2412040", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "77b3394a0999507d050c98b27f354c6e4809cc6221e0228f360a5373f2412040", kill_on_drop: false }`
[INFO] [stdout] 77b3394a0999507d050c98b27f354c6e4809cc6221e0228f360a5373f2412040
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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" "-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" "+c2e32f1c9652b13ed99608599c1e855462f421f3" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 90399168fd740d71f02577c457b1a3a3dd2b655c38ba7f7c7606aa019de7bd1c
[INFO] running `Command { std: "docker" "start" "-a" "90399168fd740d71f02577c457b1a3a3dd2b655c38ba7f7c7606aa019de7bd1c", kill_on_drop: false }`
[INFO] [stderr]    Compiling ahash v0.8.12
[INFO] [stderr]    Compiling allocator-api2 v0.2.21
[INFO] [stderr]    Compiling syn v2.0.110
[INFO] [stderr]    Compiling hashbrown v0.14.5
[INFO] [stderr]    Compiling thiserror-impl v1.0.69
[INFO] [stderr]    Compiling thiserror v1.0.69
[INFO] [stderr]    Compiling fast-list v0.1.8 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `LinkedListItem`
[INFO] [stdout]  --> src/walker.rs:1:55
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::linked_list::{LinkedList, LinkedListIndex, LinkedListItem};
[INFO] [stdout]   |                                                       ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/linked_list.rs:402:13
[INFO] [stdout]     |
[INFO] [stdout] 402 |         let mut current = index;
[INFO] [stdout]     |             ----^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/linked_list.rs:511:29
[INFO] [stdout]     |
[INFO] [stdout] 511 |     pub fn retain<F>(&self, mut f: F) -> Self
[INFO] [stdout]     |                             ----^
[INFO] [stdout]     |                             |
[INFO] [stdout]     |                             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 4.83s
[INFO] [stdout] warning: unused variable: `list`
[INFO] [stdout]   --> src/walker.rs:82:19
[INFO] [stdout]    |
[INFO] [stdout] 82 |     pub fn new<T>(list: &LinkedList<T>, start: LinkedListIndex, reverse: bool) -> Self {
[INFO] [stdout]    |                   ^^^^ help: if this is intentional, prefix it with an underscore: `_list`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Walker` is never used
[INFO] [stdout]   --> src/walker.rs:10:11
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub trait Walker<Context> {
[INFO] [stdout]    |           ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `WalkerIter` is never constructed
[INFO] [stdout]   --> src/walker.rs:30:12
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub struct WalkerIter<W, C> {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `context`, `inner_ref`, and `inner_mut` are never used
[INFO] [stdout]   --> src/walker.rs:40:12
[INFO] [stdout]    |
[INFO] [stdout] 35 | / impl<W, C> WalkerIter<W, C>
[INFO] [stdout] 36 | | where
[INFO] [stdout] 37 | |     W: Walker<C>,
[INFO] [stdout] 38 | |     C: Clone,
[INFO] [stdout]    | |_____________- methods in this implementation
[INFO] [stdout] 39 |   {
[INFO] [stdout] 40 |       pub fn context(&self) -> C {
[INFO] [stdout]    |              ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 44 |       pub fn inner_ref(&self) -> &W {
[INFO] [stdout]    |              ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 48 |       pub fn inner_mut(&mut self) -> &mut W {
[INFO] [stdout]    |              ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LinkedListWalker` is never constructed
[INFO] [stdout]   --> src/walker.rs:74:12
[INFO] [stdout]    |
[INFO] [stdout] 74 | pub struct LinkedListWalker {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/walker.rs:82:12
[INFO] [stdout]    |
[INFO] [stdout] 81 | impl LinkedListWalker {
[INFO] [stdout]    | --------------------- associated function in this implementation
[INFO] [stdout] 82 |     pub fn new<T>(list: &LinkedList<T>, start: LinkedListIndex, reverse: bool) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "90399168fd740d71f02577c457b1a3a3dd2b655c38ba7f7c7606aa019de7bd1c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "90399168fd740d71f02577c457b1a3a3dd2b655c38ba7f7c7606aa019de7bd1c", kill_on_drop: false }`
[INFO] [stdout] 90399168fd740d71f02577c457b1a3a3dd2b655c38ba7f7c7606aa019de7bd1c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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" "-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" "+c2e32f1c9652b13ed99608599c1e855462f421f3" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 344f7f80b6d62037b10879592f79e4fd6b8d43b0f465f952ce94690bc46f2c36
[INFO] running `Command { std: "docker" "start" "-a" "344f7f80b6d62037b10879592f79e4fd6b8d43b0f465f952ce94690bc46f2c36", kill_on_drop: false }`
[INFO] [stderr]    Compiling zerocopy v0.8.27
[INFO] [stderr]    Compiling serde_core v1.0.228
[INFO] [stderr]    Compiling serde v1.0.228
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling hashbrown v0.6.3
[INFO] [stderr]    Compiling clap_lex v0.7.6
[INFO] [stderr]    Compiling syn v2.0.110
[INFO] [stderr]    Compiling anstyle v1.0.13
[INFO] [stderr]    Compiling ahash v0.2.19
[INFO] [stderr]    Compiling is-terminal v0.4.17
[INFO] [stderr]    Compiling crossbeam-channel v0.5.15
[INFO] [stderr]    Compiling crossbeam-queue v0.3.12
[INFO] [stderr]    Compiling hex v0.4.3
[INFO] [stderr]    Compiling rand_isaac v0.2.0
[INFO] [stderr]    Compiling clap_builder v4.5.51
[INFO] [stderr]    Compiling crossbeam v0.8.4
[INFO] [stderr]    Compiling clap v4.5.51
[INFO] [stderr]    Compiling serde_json v1.0.145
[INFO] [stderr]    Compiling zerocopy-derive v0.8.27
[INFO] [stderr]    Compiling serde_derive v1.0.228
[INFO] [stderr]    Compiling thiserror-impl v1.0.69
[INFO] [stderr]    Compiling thiserror v1.0.69
[INFO] [stderr]    Compiling ppv-lite86 v0.2.21
[INFO] [stderr]    Compiling half v2.7.1
[INFO] [stderr]    Compiling ahash v0.8.12
[INFO] [stderr]    Compiling ciborium-ll v0.2.2
[INFO] [stderr]    Compiling hashbrown v0.14.5
[INFO] [stderr]    Compiling tinytemplate v1.2.1
[INFO] [stderr]    Compiling ciborium v0.2.2
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling fast-list v0.1.8 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `LinkedListItem`
[INFO] [stdout]  --> src/walker.rs:1:55
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::linked_list::{LinkedList, LinkedListIndex, LinkedListItem};
[INFO] [stdout]   |                                                       ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/linked_list.rs:402:13
[INFO] [stdout]     |
[INFO] [stdout] 402 |         let mut current = index;
[INFO] [stdout]     |             ----^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/linked_list.rs:511:29
[INFO] [stdout]     |
[INFO] [stdout] 511 |     pub fn retain<F>(&self, mut f: F) -> Self
[INFO] [stdout]     |                             ----^
[INFO] [stdout]     |                             |
[INFO] [stdout]     |                             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `list`
[INFO] [stdout]   --> src/walker.rs:82:19
[INFO] [stdout]    |
[INFO] [stdout] 82 |     pub fn new<T>(list: &LinkedList<T>, start: LinkedListIndex, reverse: bool) -> Self {
[INFO] [stdout]    |                   ^^^^ help: if this is intentional, prefix it with an underscore: `_list`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Walker` is never used
[INFO] [stdout]   --> src/walker.rs:10:11
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub trait Walker<Context> {
[INFO] [stdout]    |           ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `WalkerIter` is never constructed
[INFO] [stdout]   --> src/walker.rs:30:12
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub struct WalkerIter<W, C> {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `context`, `inner_ref`, and `inner_mut` are never used
[INFO] [stdout]   --> src/walker.rs:40:12
[INFO] [stdout]    |
[INFO] [stdout] 35 | / impl<W, C> WalkerIter<W, C>
[INFO] [stdout] 36 | | where
[INFO] [stdout] 37 | |     W: Walker<C>,
[INFO] [stdout] 38 | |     C: Clone,
[INFO] [stdout]    | |_____________- methods in this implementation
[INFO] [stdout] 39 |   {
[INFO] [stdout] 40 |       pub fn context(&self) -> C {
[INFO] [stdout]    |              ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 44 |       pub fn inner_ref(&self) -> &W {
[INFO] [stdout]    |              ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 48 |       pub fn inner_mut(&mut self) -> &mut W {
[INFO] [stdout]    |              ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LinkedListWalker` is never constructed
[INFO] [stdout]   --> src/walker.rs:74:12
[INFO] [stdout]    |
[INFO] [stdout] 74 | pub struct LinkedListWalker {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/walker.rs:82:12
[INFO] [stdout]    |
[INFO] [stdout] 81 | impl LinkedListWalker {
[INFO] [stdout]    | --------------------- associated function in this implementation
[INFO] [stdout] 82 |     pub fn new<T>(list: &LinkedList<T>, start: LinkedListIndex, reverse: bool) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling graphlib v0.6.3
[INFO] [stderr]    Compiling criterion v0.5.1
[INFO] [stdout] warning: unused import: `LinkedListItem`
[INFO] [stdout]  --> src/walker.rs:1:55
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::linked_list::{LinkedList, LinkedListIndex, LinkedListItem};
[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 imports: `AtomicI32` and `Ordering`
[INFO] [stdout]  --> tests/test_linked_list.rs:3:18
[INFO] [stdout]   |
[INFO] [stdout] 3 |         atomic::{AtomicI32, Ordering},
[INFO] [stdout]   |                  ^^^^^^^^^  ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/linked_list.rs:402:13
[INFO] [stdout]     |
[INFO] [stdout] 402 |         let mut current = index;
[INFO] [stdout]     |             ----^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/linked_list.rs:511:29
[INFO] [stdout]     |
[INFO] [stdout] 511 |     pub fn retain<F>(&self, mut f: F) -> Self
[INFO] [stdout]     |                             ----^
[INFO] [stdout]     |                             |
[INFO] [stdout]     |                             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `list`
[INFO] [stdout]   --> src/walker.rs:82:19
[INFO] [stdout]    |
[INFO] [stdout] 82 |     pub fn new<T>(list: &LinkedList<T>, start: LinkedListIndex, reverse: bool) -> Self {
[INFO] [stdout]    |                   ^^^^ help: if this is intentional, prefix it with an underscore: `_list`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `iter` is never used
[INFO] [stdout]   --> src/walker.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub trait Walker<Context> {
[INFO] [stdout]    |           ------ method in this trait
[INFO] [stdout] ...
[INFO] [stdout] 16 |     fn iter(self, context: Context) -> WalkerIter<Self, Context>
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `WalkerIter` is never constructed
[INFO] [stdout]   --> src/walker.rs:30:12
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub struct WalkerIter<W, C> {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `context`, `inner_ref`, and `inner_mut` are never used
[INFO] [stdout]   --> src/walker.rs:40:12
[INFO] [stdout]    |
[INFO] [stdout] 35 | / impl<W, C> WalkerIter<W, C>
[INFO] [stdout] 36 | | where
[INFO] [stdout] 37 | |     W: Walker<C>,
[INFO] [stdout] 38 | |     C: Clone,
[INFO] [stdout]    | |_____________- methods in this implementation
[INFO] [stdout] 39 |   {
[INFO] [stdout] 40 |       pub fn context(&self) -> C {
[INFO] [stdout]    |              ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 44 |       pub fn inner_ref(&self) -> &W {
[INFO] [stdout]    |              ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 48 |       pub fn inner_mut(&mut self) -> &mut W {
[INFO] [stdout]    |              ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]    --> tests/test_linked_list.rs:147:16
[INFO] [stdout]     |
[INFO] [stdout] 147 |     let (a, b, c, d) = {
[INFO] [stdout]     |                ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 24.57s
[INFO] running `Command { std: "docker" "inspect" "344f7f80b6d62037b10879592f79e4fd6b8d43b0f465f952ce94690bc46f2c36", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "344f7f80b6d62037b10879592f79e4fd6b8d43b0f465f952ce94690bc46f2c36", kill_on_drop: false }`
[INFO] [stdout] 344f7f80b6d62037b10879592f79e4fd6b8d43b0f465f952ce94690bc46f2c36
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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" "-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" "+c2e32f1c9652b13ed99608599c1e855462f421f3" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 066b7ebcb1337ab08ece5e0c875c3405f75754c3563f082fecb73f037c259b84
[INFO] running `Command { std: "docker" "start" "-a" "066b7ebcb1337ab08ece5e0c875c3405f75754c3563f082fecb73f037c259b84", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `LinkedListItem`
[INFO] [stderr]  --> src/walker.rs:1:55
[INFO] [stderr]   |
[INFO] [stderr] 1 | use crate::linked_list::{LinkedList, LinkedListIndex, LinkedListItem};
[INFO] [stderr]   |                                                       ^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/linked_list.rs:402:13
[INFO] [stderr]     |
[INFO] [stderr] 402 |         let mut current = index;
[INFO] [stderr]     |             ----^^^^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/linked_list.rs:511:29
[INFO] [stderr]     |
[INFO] [stderr] 511 |     pub fn retain<F>(&self, mut f: F) -> Self
[INFO] [stderr]     |                             ----^
[INFO] [stderr]     |                             |
[INFO] [stderr]     |                             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `list`
[INFO] [stderr]   --> src/walker.rs:82:19
[INFO] [stderr]    |
[INFO] [stderr] 82 |     pub fn new<T>(list: &LinkedList<T>, start: LinkedListIndex, reverse: bool) -> Self {
[INFO] [stderr]    |                   ^^^^ help: if this is intentional, prefix it with an underscore: `_list`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait `Walker` is never used
[INFO] [stderr]   --> src/walker.rs:10:11
[INFO] [stderr]    |
[INFO] [stderr] 10 | pub trait Walker<Context> {
[INFO] [stderr]    |           ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct `WalkerIter` is never constructed
[INFO] [stderr]   --> src/walker.rs:30:12
[INFO] [stderr]    |
[INFO] [stderr] 30 | pub struct WalkerIter<W, C> {
[INFO] [stderr]    |            ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: methods `context`, `inner_ref`, and `inner_mut` are never used
[INFO] [stderr]   --> src/walker.rs:40:12
[INFO] [stderr]    |
[INFO] [stderr] 35 | / impl<W, C> WalkerIter<W, C>
[INFO] [stderr] 36 | | where
[INFO] [stderr] 37 | |     W: Walker<C>,
[INFO] [stderr] 38 | |     C: Clone,
[INFO] [stderr]    | |_____________- methods in this implementation
[INFO] [stderr] 39 |   {
[INFO] [stderr] 40 |       pub fn context(&self) -> C {
[INFO] [stderr]    |              ^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 44 |       pub fn inner_ref(&self) -> &W {
[INFO] [stderr]    |              ^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 48 |       pub fn inner_mut(&mut self) -> &mut W {
[INFO] [stderr]    |              ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `LinkedListWalker` is never constructed
[INFO] [stderr]   --> src/walker.rs:74:12
[INFO] [stderr]    |
[INFO] [stderr] 74 | pub struct LinkedListWalker {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function `new` is never used
[INFO] [stderr]   --> src/walker.rs:82:12
[INFO] [stderr]    |
[INFO] [stderr] 81 | impl LinkedListWalker {
[INFO] [stderr]    | --------------------- associated function in this implementation
[INFO] [stderr] 82 |     pub fn new<T>(list: &LinkedList<T>, start: LinkedListIndex, reverse: bool) -> Self {
[INFO] [stderr]    |            ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `fast-list` (lib) generated 9 warnings (run `cargo fix --lib -p fast-list` to apply 4 suggestions)
[INFO] [stderr] warning: unused imports: `AtomicI32` and `Ordering`
[INFO] [stderr]  --> tests/test_linked_list.rs:3:18
[INFO] [stderr]   |
[INFO] [stderr] 3 |         atomic::{AtomicI32, Ordering},
[INFO] [stderr]   |                  ^^^^^^^^^  ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `c`
[INFO] [stderr]    --> tests/test_linked_list.rs:147:16
[INFO] [stderr]     |
[INFO] [stderr] 147 |     let (a, b, c, d) = {
[INFO] [stderr]     |                ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method `iter` is never used
[INFO] [stderr]   --> src/walker.rs:16:8
[INFO] [stderr]    |
[INFO] [stderr] 10 | pub trait Walker<Context> {
[INFO] [stderr]    |           ------ method in this trait
[INFO] [stderr] ...
[INFO] [stderr] 16 |     fn iter(self, context: Context) -> WalkerIter<Self, Context>
[INFO] [stderr]    |        ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `fast-list` (test "test_linked_list") generated 2 warnings (run `cargo fix --test "test_linked_list" -p fast-list` to apply 2 suggestions)
[INFO] [stderr] warning: `fast-list` (lib test) generated 7 warnings (6 duplicates)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.16s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/fast_list-8e0374f3d501a7e9)
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test walker::tests::test_list_walker ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running tests/test_linked_list.rs (/opt/rustwide/target/debug/deps/test_linked_list-f486cd49a6a47347)
[INFO] [stdout] 
[INFO] [stdout] running 7 tests
[INFO] [stdout] test test_associated_data ... ok
[INFO] [stdout] test test_fn_push_back_fn_next_of_fn_prev_of ... ok
[INFO] [stdout] test test_iter ... ok
[INFO] [stdout] test test_popback ... ok
[INFO] [stdout] test test_split_off ... ok
[INFO] [stdout] test test_multithreading ... ok
[INFO] [stderr]    Doc-tests fast_list
[INFO] [stdout] test test_fn_insert_after_fn_insert_before ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 7 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 6 tests
[INFO] [stdout] test src/lib.rs - (line 109) ... ignored
[INFO] [stdout] test src/lib.rs - (line 117) ... ignored
[INFO] [stdout] test src/lib.rs - (line 96) ... ignored
[INFO] [stdout] test src/lib.rs - (line 31) ... ok
[INFO] [stdout] test src/linked_list.rs - linked_list::LinkedList<T>::iter (line 315) ... ok
[INFO] [stdout] test src/lib.rs - (line 54) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 3 passed; 0 failed; 3 ignored; 0 measured; 0 filtered out; finished in 0.45s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "066b7ebcb1337ab08ece5e0c875c3405f75754c3563f082fecb73f037c259b84", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "066b7ebcb1337ab08ece5e0c875c3405f75754c3563f082fecb73f037c259b84", kill_on_drop: false }`
[INFO] [stdout] 066b7ebcb1337ab08ece5e0c875c3405f75754c3563f082fecb73f037c259b84
