[INFO] fetching crate lk_math 0.4.0...
[INFO] checking lk_math-0.4.0 against try#7014e13d5becc920d4bea3cd87942c8a13d359bf+rustflags=-Dtail_expr_drop_order for pr-129864
[INFO] extracting crate lk_math 0.4.0 into /workspace/builds/worker-4-tc2/source
[INFO] validating manifest of crates.io crate lk_math 0.4.0 on toolchain 7014e13d5becc920d4bea3cd87942c8a13d359bf
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "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-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 7 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 634caa4426383e07ad480677cefdb29403311ca6b3736e7d45f9b90babc30cb8
[INFO] running `Command { std: "docker" "start" "-a" "634caa4426383e07ad480677cefdb29403311ca6b3736e7d45f9b90babc30cb8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "634caa4426383e07ad480677cefdb29403311ca6b3736e7d45f9b90babc30cb8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "634caa4426383e07ad480677cefdb29403311ca6b3736e7d45f9b90babc30cb8", kill_on_drop: false }`
[INFO] [stdout] 634caa4426383e07ad480677cefdb29403311ca6b3736e7d45f9b90babc30cb8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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 -Dtail_expr_drop_order" "-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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 720daa0034ce0da2dd8e89d1af356fa6c5cd3c1d47430706111d3f1059e365cf
[INFO] running `Command { std: "docker" "start" "-a" "720daa0034ce0da2dd8e89d1af356fa6c5cd3c1d47430706111d3f1059e365cf", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.86
[INFO] [stderr]    Compiling unicode-ident v1.0.13
[INFO] [stderr]    Compiling serde v1.0.210
[INFO] [stderr]    Compiling quote v1.0.37
[INFO] [stderr]    Compiling syn v2.0.77
[INFO] [stderr]    Compiling serde_derive v1.0.210
[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] error: this value of type `Result<[T; N], Vec<T>>` has significant drop implementation that will have a different drop order from that of Edition 2021
[INFO] [stdout]   --> src/vector.rs:71:19
[INFO] [stdout]    |
[INFO] [stdout] 59 |         fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error>
[INFO] [stdout]    |                               ------- these local bindings with significant drop implementation may observe changes in drop order under Edition 2024
[INFO] [stdout] ...
[INFO] [stdout] 71 |             match data.try_into() {
[INFO] [stdout]    |                   ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this changes meaning in Rust 2024
[INFO] [stdout]    = note: for more information, see issue #123739 <https://github.com/rust-lang/rust/issues/123739>
[INFO] [stdout]    = note: requested on the command line with `-D tail-expr-drop-order`
[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] error: aborting due to 1 previous error; 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `lk_math` (lib) due to 2 previous errors; 7 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: this value of type `Result<[T; N], Vec<T>>` has significant drop implementation that will have a different drop order from that of Edition 2021
[INFO] [stdout]   --> src/vector.rs:71:19
[INFO] [stdout]    |
[INFO] [stdout] 59 |         fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error>
[INFO] [stdout]    |                               ------- these local bindings with significant drop implementation may observe changes in drop order under Edition 2024
[INFO] [stdout] ...
[INFO] [stdout] 71 |             match data.try_into() {
[INFO] [stdout]    |                   ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this changes meaning in Rust 2024
[INFO] [stdout]    = note: for more information, see issue #123739 <https://github.com/rust-lang/rust/issues/123739>
[INFO] [stdout]    = note: requested on the command line with `-D tail-expr-drop-order`
[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] error: aborting due to 1 previous error; 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `lk_math` (lib test) due to 2 previous errors; 6 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "720daa0034ce0da2dd8e89d1af356fa6c5cd3c1d47430706111d3f1059e365cf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "720daa0034ce0da2dd8e89d1af356fa6c5cd3c1d47430706111d3f1059e365cf", kill_on_drop: false }`
[INFO] [stdout] 720daa0034ce0da2dd8e89d1af356fa6c5cd3c1d47430706111d3f1059e365cf