[INFO] fetching crate lk_math 0.5.0...
[INFO] checking lk_math-0.5.0 against master#642c19bfc3a5c1de985bf5d0cc8207ac9d22708a for pr-148577
[INFO] extracting crate lk_math 0.5.0 into /workspace/builds/worker-5-tc1/source
[INFO] started tweaking crates.io crate lk_math 0.5.0
[INFO] finished tweaking crates.io crate lk_math 0.5.0
[INFO] tweaked toml for crates.io crate lk_math 0.5.0 written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate lk_math 0.5.0 on toolchain 642c19bfc3a5c1de985bf5d0cc8207ac9d22708a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+642c19bfc3a5c1de985bf5d0cc8207ac9d22708a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate lk_math 0.5.0 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" "+642c19bfc3a5c1de985bf5d0cc8207ac9d22708a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[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-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+642c19bfc3a5c1de985bf5d0cc8207ac9d22708a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4c503ca35004e6ab5c1ec57c36a94b404337c727b57f2a2e429896ed3d6a1b9f
[INFO] running `Command { std: "docker" "start" "-a" "4c503ca35004e6ab5c1ec57c36a94b404337c727b57f2a2e429896ed3d6a1b9f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4c503ca35004e6ab5c1ec57c36a94b404337c727b57f2a2e429896ed3d6a1b9f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4c503ca35004e6ab5c1ec57c36a94b404337c727b57f2a2e429896ed3d6a1b9f", kill_on_drop: false }`
[INFO] [stdout] 4c503ca35004e6ab5c1ec57c36a94b404337c727b57f2a2e429896ed3d6a1b9f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+642c19bfc3a5c1de985bf5d0cc8207ac9d22708a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b36f0ae0a843a16ea29ea7ae6cf81c92d65e16ef7ff372dfd56add111ca8894f
[INFO] running `Command { std: "docker" "start" "-a" "b36f0ae0a843a16ea29ea7ae6cf81c92d65e16ef7ff372dfd56add111ca8894f", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.93
[INFO] [stderr]    Compiling serde v1.0.217
[INFO] [stderr]    Compiling quote v1.0.38
[INFO] [stderr]    Compiling syn v2.0.96
[INFO] [stderr]    Compiling serde_derive v1.0.217
[INFO] [stderr]     Checking serde_arrays v0.1.0
[INFO] [stderr]     Checking lk_math v0.5.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/arraynd.rs:402:9
[INFO] [stdout]     |
[INFO] [stdout] 401 |         todo!();
[INFO] [stdout]     |         ------- any code following this expression is unreachable
[INFO] [stdout] 402 |         [].into_iter()
[INFO] [stdout]     |         ^^^^^^^^^^^^^^ unreachable expression
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/arraynd.rs:400:34
[INFO] [stdout]     |
[INFO] [stdout] 400 |     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)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/arraynd.rs:402:9
[INFO] [stdout]     |
[INFO] [stdout] 401 |         todo!();
[INFO] [stdout]     |         ------- any code following this expression is unreachable
[INFO] [stdout] 402 |         [].into_iter()
[INFO] [stdout]     |         ^^^^^^^^^^^^^^ unreachable expression
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/arraynd.rs:400:34
[INFO] [stdout]     |
[INFO] [stdout] 400 |     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)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: irrefutable `if let` pattern
[INFO] [stdout]    --> src/arraynd.rs:198:12
[INFO] [stdout]     |
[INFO] [stdout] 198 |         if let Ok(a) = (*i).try_into() {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 209 | array_vector_linear_index!(i32, usize);
[INFO] [stdout]     | -------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this pattern will always match, so the `if let` is useless
[INFO] [stdout]     = help: consider replacing the `if let` with a `let`
[INFO] [stdout]     = note: `#[warn(irrefutable_let_patterns)]` on by default
[INFO] [stdout]     = note: this warning originates in the macro `array_vector_linear_index` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `matching`
[INFO] [stdout]    --> src/arraynd.rs:400:34
[INFO] [stdout]     |
[INFO] [stdout] 400 |     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)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Perm` is never constructed
[INFO] [stdout]  --> src/permutations.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Perm<const M: usize>([usize; M]);
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `chain` is never used
[INFO] [stdout]  --> src/permutations.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | impl<const M: usize> Perm<M> {
[INFO] [stdout]   | ---------------------------- method in this implementation
[INFO] [stdout] 7 |     fn chain(&self, other: &Self) -> Self
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PermId` is never constructed
[INFO] [stdout]   --> src/permutations.rs:31:8
[INFO] [stdout]    |
[INFO] [stdout] 31 | struct PermId<const M: usize>(usize);
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `perm` is never used
[INFO] [stdout]   --> src/permutations.rs:34:12
[INFO] [stdout]    |
[INFO] [stdout] 33 | impl<const M: usize> PermId<M> {
[INFO] [stdout]    | ------------------------------ method in this implementation
[INFO] [stdout] 34 |     pub fn perm(self) -> Perm<M> {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: irrefutable `if let` pattern
[INFO] [stdout]    --> src/arraynd.rs:198:12
[INFO] [stdout]     |
[INFO] [stdout] 198 |         if let Ok(a) = (*i).try_into() {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 209 | array_vector_linear_index!(i32, usize);
[INFO] [stdout]     | -------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this pattern will always match, so the `if let` is useless
[INFO] [stdout]     = help: consider replacing the `if let` with a `let`
[INFO] [stdout]     = note: `#[warn(irrefutable_let_patterns)]` on by default
[INFO] [stdout]     = note: this warning originates in the macro `array_vector_linear_index` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `matching`
[INFO] [stdout]    --> src/arraynd.rs:400:34
[INFO] [stdout]     |
[INFO] [stdout] 400 |     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)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 11.54s
[INFO] running `Command { std: "docker" "inspect" "b36f0ae0a843a16ea29ea7ae6cf81c92d65e16ef7ff372dfd56add111ca8894f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b36f0ae0a843a16ea29ea7ae6cf81c92d65e16ef7ff372dfd56add111ca8894f", kill_on_drop: false }`
[INFO] [stdout] b36f0ae0a843a16ea29ea7ae6cf81c92d65e16ef7ff372dfd56add111ca8894f
