[INFO] fetching crate lk_math 0.4.0...
[INFO] checking lk_math-0.4.0 against master#22572d0994593197593e2a1b7b18d720a9a349a7 for pr-126452-1
[INFO] extracting crate lk_math 0.4.0 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate lk_math 0.4.0 on toolchain 22572d0994593197593e2a1b7b18d720a9a349a7
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate lk_math 0.4.0
[INFO] finished tweaking crates.io crate lk_math 0.4.0
[INFO] tweaked toml for crates.io crate lk_math 0.4.0 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 8 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded serde_arrays v0.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d0f0873c4a90164bc1d9e0a936ff080d6f09ac60623d036c48470dc75b033ab6
[INFO] running `Command { std: "docker" "start" "-a" "d0f0873c4a90164bc1d9e0a936ff080d6f09ac60623d036c48470dc75b033ab6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d0f0873c4a90164bc1d9e0a936ff080d6f09ac60623d036c48470dc75b033ab6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d0f0873c4a90164bc1d9e0a936ff080d6f09ac60623d036c48470dc75b033ab6", kill_on_drop: false }`
[INFO] [stdout] d0f0873c4a90164bc1d9e0a936ff080d6f09ac60623d036c48470dc75b033ab6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ce117073956fc8726370ebdf561280423c21dd44af4671b379d802589d0d7e56
[INFO] running `Command { std: "docker" "start" "-a" "ce117073956fc8726370ebdf561280423c21dd44af4671b379d802589d0d7e56", kill_on_drop: false }`
[INFO] [stderr]     Checking serde_arrays v0.1.0
[INFO] [stderr]     Checking lk_math v0.4.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/arraynd.rs:294:9
[INFO] [stdout]     |
[INFO] [stdout] 293 |         todo!();
[INFO] [stdout]     |         ------- any code following this expression is unreachable
[INFO] [stdout] 294 |         [].into_iter()
[INFO] [stdout]     |         ^^^^^^^^^^^^^^ unreachable expression
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `matching`
[INFO] [stdout]    --> src/arraynd.rs:292:38
[INFO] [stdout]     |
[INFO] [stdout] 292 |     pub fn iter_block(&mut self, mut matching: [Option<usize>; N]) -> impl Iterator<Item = &T> {
[INFO] [stdout]     |                                      ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_matching`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/arraynd.rs:292:34
[INFO] [stdout]     |
[INFO] [stdout] 292 |     pub fn iter_block(&mut self, mut matching: [Option<usize>; N]) -> impl Iterator<Item = &T> {
[INFO] [stdout]     |                                  ----^^^^^^^^
[INFO] [stdout]     |                                  |
[INFO] [stdout]     |                                  help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/arraynd.rs:294:9
[INFO] [stdout]     |
[INFO] [stdout] 293 |         todo!();
[INFO] [stdout]     |         ------- any code following this expression is unreachable
[INFO] [stdout] 294 |         [].into_iter()
[INFO] [stdout]     |         ^^^^^^^^^^^^^^ unreachable expression
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `matching`
[INFO] [stdout]    --> src/arraynd.rs:292:38
[INFO] [stdout]     |
[INFO] [stdout] 292 |     pub fn iter_block(&mut self, mut matching: [Option<usize>; N]) -> impl Iterator<Item = &T> {
[INFO] [stdout]     |                                      ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_matching`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/arraynd.rs:292:34
[INFO] [stdout]     |
[INFO] [stdout] 292 |     pub fn iter_block(&mut self, mut matching: [Option<usize>; N]) -> impl Iterator<Item = &T> {
[INFO] [stdout]     |                                  ----^^^^^^^^
[INFO] [stdout]     |                                  |
[INFO] [stdout]     |                                  help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]   --> src/permutations.rs:60:13
[INFO] [stdout]    |
[INFO] [stdout] 60 |     fn from(value: Perm<M>) -> Self {
[INFO] [stdout]    |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `GroupElement` is never used
[INFO] [stdout]  --> src/group/map.rs:1:6
[INFO] [stdout]   |
[INFO] [stdout] 1 | type GroupElement<const M: usize> = [usize; M];
[INFO] [stdout]   |      ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Group` is never constructed
[INFO] [stdout]  --> src/group/map.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct Group<const M: usize>;
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated functions `identity` and `group_element` are never used
[INFO] [stdout]   --> src/group/map.rs:6:12
[INFO] [stdout]    |
[INFO] [stdout] 5  | impl<const M: usize> Group<M> {
[INFO] [stdout]    | ----------------------------- associated functions in this implementation
[INFO] [stdout] 6  |     pub fn identity() -> GroupElement<M> {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 14 |     pub fn group_element(mut id: usize) -> GroupElement<M> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]   --> src/permutations.rs:60:13
[INFO] [stdout]    |
[INFO] [stdout] 60 |     fn from(value: Perm<M>) -> Self {
[INFO] [stdout]    |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `identity` is never used
[INFO] [stdout]  --> src/group/map.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | impl<const M: usize> Group<M> {
[INFO] [stdout]   | ----------------------------- associated function in this implementation
[INFO] [stdout] 6 |     pub fn identity() -> GroupElement<M> {
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_gen` is never used
[INFO] [stdout]   --> src/group/map.rs:38:8
[INFO] [stdout]    |
[INFO] [stdout] 38 |     fn test_gen<const M: usize>() {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.64s
[INFO] running `Command { std: "docker" "inspect" "ce117073956fc8726370ebdf561280423c21dd44af4671b379d802589d0d7e56", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ce117073956fc8726370ebdf561280423c21dd44af4671b379d802589d0d7e56", kill_on_drop: false }`
[INFO] [stdout] ce117073956fc8726370ebdf561280423c21dd44af4671b379d802589d0d7e56