[INFO] fetching crate convolician 0.1.0...
[INFO] checking convolician-0.1.0 against master#2748a9fd93dd1a00a4521f4f16de5befbf77f6cd for pr-62262-1
[INFO] extracting crate convolician 0.1.0 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate convolician 0.1.0 on toolchain 2748a9fd93dd1a00a4521f4f16de5befbf77f6cd
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate convolician 0.1.0
[INFO] finished tweaking crates.io crate convolician 0.1.0
[INFO] tweaked toml for crates.io crate convolician 0.1.0 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate crates.io crate convolician 0.1.0 already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] af7c6d7534babbd95d6d4606a14d5c2261cd54aefd70cee821f4c40e205b4567
[INFO] running `"docker" "start" "-a" "af7c6d7534babbd95d6d4606a14d5c2261cd54aefd70cee821f4c40e205b4567"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.60
[INFO] [stderr]     Checking unicode-width v0.1.5
[INFO] [stderr]    Compiling num-complex v0.2.3
[INFO] [stderr]     Checking itertools v0.7.11
[INFO] [stderr]     Checking num-traits v0.2.8
[INFO] [stderr]     Checking rand_chacha v0.1.1
[INFO] [stderr]     Checking rand_pcg v0.1.2
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking getrandom v0.1.8
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking atty v0.2.13
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]     Checking rand v0.6.5
[INFO] [stderr]     Checking rand_core v0.5.0
[INFO] [stderr]     Checking rand_chacha v0.2.1
[INFO] [stderr]     Checking ndarray v0.12.1
[INFO] [stderr]     Checking rand v0.7.0
[INFO] [stderr]     Checking ndarray-rand v0.9.0
[INFO] [stderr]     Checking convolician v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `super::*`
[INFO] [stderr]   --> src/array_implementation/random_matrix.rs:14:9
[INFO] [stderr]    |
[INFO] [stderr] 14 |     use super::*;
[INFO] [stderr]    |         ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `d_x`
[INFO] [stderr]   --> src/array_implementation/mod.rs:15:9
[INFO] [stderr]    |
[INFO] [stderr] 15 |     let d_x = central_difference::central_difference_x(&m);
[INFO] [stderr]    |         ^^^ help: consider prefixing with an underscore: `_d_x`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `centre`
[INFO] [stderr]   --> src/array_implementation/central_difference.rs:29:13
[INFO] [stderr]    |
[INFO] [stderr] 29 |     let mut centre = d_x.slice_mut(s![.., 1..-1]);
[INFO] [stderr]    |             ^^^^^^ help: consider prefixing with an underscore: `_centre`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `before`
[INFO] [stderr]   --> src/array_implementation/central_difference.rs:30:9
[INFO] [stderr]    |
[INFO] [stderr] 30 |     let before = &m.slice(s![.., ..-2]);
[INFO] [stderr]    |         ^^^^^^ help: consider prefixing with an underscore: `_before`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `after`
[INFO] [stderr]   --> src/array_implementation/central_difference.rs:31:9
[INFO] [stderr]    |
[INFO] [stderr] 31 |     let after  = &m.slice(s![.., 2.. ]);
[INFO] [stderr]    |         ^^^^^ help: consider prefixing with an underscore: `_after`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `d_x`
[INFO] [stderr]   --> src/array_implementation/mod.rs:15:9
[INFO] [stderr]    |
[INFO] [stderr] 15 |     let d_x = central_difference::central_difference_x(&m);
[INFO] [stderr]    |         ^^^ help: consider prefixing with an underscore: `_d_x`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `centre`
[INFO] [stderr]   --> src/array_implementation/central_difference.rs:29:13
[INFO] [stderr]    |
[INFO] [stderr] 29 |     let mut centre = d_x.slice_mut(s![.., 1..-1]);
[INFO] [stderr]    |             ^^^^^^ help: consider prefixing with an underscore: `_centre`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `before`
[INFO] [stderr]   --> src/array_implementation/central_difference.rs:30:9
[INFO] [stderr]    |
[INFO] [stderr] 30 |     let before = &m.slice(s![.., ..-2]);
[INFO] [stderr]    |         ^^^^^^ help: consider prefixing with an underscore: `_before`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `after`
[INFO] [stderr]   --> src/array_implementation/central_difference.rs:31:9
[INFO] [stderr]    |
[INFO] [stderr] 31 |     let after  = &m.slice(s![.., 2.. ]);
[INFO] [stderr]    |         ^^^^^ help: consider prefixing with an underscore: `_after`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/array_implementation/central_difference.rs:29:9
[INFO] [stderr]    |
[INFO] [stderr] 29 |     let mut centre = d_x.slice_mut(s![.., 1..-1]);
[INFO] [stderr]    |         ----^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `central_difference_x_2`
[INFO] [stderr]   --> src/array_implementation/central_difference.rs:19:1
[INFO] [stderr]    |
[INFO] [stderr] 19 | pub fn central_difference_x_2(m: &Array2<u8>) -> Array2<i16> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `test_central_difference_x_negative_gradients`
[INFO] [stderr]   --> src/array_implementation/central_difference.rs:83:5
[INFO] [stderr]    |
[INFO] [stderr] 83 |     fn test_central_difference_x_negative_gradients() {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `test_central_difference_x_one_column`
[INFO] [stderr]   --> src/array_implementation/central_difference.rs:87:5
[INFO] [stderr]    |
[INFO] [stderr] 87 |     fn test_central_difference_x_one_column() {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `test_central_difference_x_zero_columns`
[INFO] [stderr]   --> src/array_implementation/central_difference.rs:91:5
[INFO] [stderr]    |
[INFO] [stderr] 91 |     fn test_central_difference_x_zero_columns() {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/array_implementation/central_difference.rs:29:9
[INFO] [stderr]    |
[INFO] [stderr] 29 |     let mut centre = d_x.slice_mut(s![.., 1..-1]);
[INFO] [stderr]    |         ----^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `central_difference_x_2`
[INFO] [stderr]   --> src/array_implementation/central_difference.rs:19:1
[INFO] [stderr]    |
[INFO] [stderr] 19 | pub fn central_difference_x_2(m: &Array2<u8>) -> Array2<i16> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 15.40s
[INFO] running `"docker" "inspect" "af7c6d7534babbd95d6d4606a14d5c2261cd54aefd70cee821f4c40e205b4567"`
[INFO] running `"docker" "rm" "-f" "af7c6d7534babbd95d6d4606a14d5c2261cd54aefd70cee821f4c40e205b4567"`
[INFO] [stdout] af7c6d7534babbd95d6d4606a14d5c2261cd54aefd70cee821f4c40e205b4567