[INFO] cloning repository https://github.com/2vincentLin/absagl
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/2vincentLin/absagl" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2F2vincentLin%2Fabsagl", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2F2vincentLin%2Fabsagl'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 60051dab1d981c17a538babbf9ab238a20b01676
[INFO] checking 2vincentLin/absagl against master#3129d37ef7075ee3cbaa3d6cbe1b5794f67192b0 for pr-143164
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2F2vincentLin%2Fabsagl" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/2vincentLin/absagl
[INFO] finished tweaking git repo https://github.com/2vincentLin/absagl
[INFO] tweaked toml for git repo https://github.com/2vincentLin/absagl written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/2vincentLin/absagl on toolchain 3129d37ef7075ee3cbaa3d6cbe1b5794f67192b0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3129d37ef7075ee3cbaa3d6cbe1b5794f67192b0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/2vincentLin/absagl 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" "+3129d37ef7075ee3cbaa3d6cbe1b5794f67192b0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+3129d37ef7075ee3cbaa3d6cbe1b5794f67192b0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c8b835b98d01c738c79f639978783f788bcc7219d93b7642a22031f13132db83
[INFO] running `Command { std: "docker" "start" "-a" "c8b835b98d01c738c79f639978783f788bcc7219d93b7642a22031f13132db83", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c8b835b98d01c738c79f639978783f788bcc7219d93b7642a22031f13132db83", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c8b835b98d01c738c79f639978783f788bcc7219d93b7642a22031f13132db83", kill_on_drop: false }`
[INFO] [stdout] c8b835b98d01c738c79f639978783f788bcc7219d93b7642a22031f13132db83
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+3129d37ef7075ee3cbaa3d6cbe1b5794f67192b0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0139c15f5196edfb59249ea5e3cbda38881dc2c323e48b02ed2c9e662d651e90
[INFO] running `Command { std: "docker" "start" "-a" "0139c15f5196edfb59249ea5e3cbda38881dc2c323e48b02ed2c9e662d651e90", kill_on_drop: false }`
[INFO] [stderr]     Checking memchr v2.7.5
[INFO] [stderr]     Checking jiff v0.2.15
[INFO] [stderr]     Checking either v1.15.0
[INFO] [stderr]     Checking anstream v0.6.19
[INFO] [stderr]     Checking rayon v1.10.0
[INFO] [stderr]     Checking aho-corasick v1.1.3
[INFO] [stderr]     Checking regex-automata v0.4.9
[INFO] [stderr]     Checking regex v1.11.1
[INFO] [stderr]     Checking env_filter v0.1.3
[INFO] [stderr]     Checking env_logger v0.11.8
[INFO] [stderr]     Checking absagl v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `absagl::error::AbsaglError`
[INFO] [stdout]  --> src/bin/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use absagl::error::AbsaglError;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `absagl::groups::dihedral::DihedralElement`
[INFO] [stdout]  --> src/bin/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use absagl::groups::dihedral::DihedralElement;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `absagl::groups::factor::Coset`
[INFO] [stdout]  --> src/bin/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use absagl::groups::factor::Coset;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `absagl::groups::factor::CosetError`
[INFO] [stdout]  --> src/bin/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use absagl::groups::factor::CosetError;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `absagl::groups::factor::FactorGroup`
[INFO] [stdout]  --> src/bin/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use absagl::groups::factor::FactorGroup;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `absagl::groups::permutation::AlternatingGroupElement`
[INFO] [stdout]  --> src/bin/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use absagl::groups::permutation::AlternatingGroupElement;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `absagl::groups::permutation::PermutationError`
[INFO] [stdout]  --> src/bin/main.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use absagl::groups::permutation::PermutationError;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `absagl::groups::CanonicalRepr`
[INFO] [stdout]   --> src/bin/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use absagl::groups::CanonicalRepr;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `absagl::groups::CheckedOp`
[INFO] [stdout]   --> src/bin/main.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | use absagl::groups::CheckedOp;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `absagl::groups::GroupElement`
[INFO] [stdout]   --> src/bin/main.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | use absagl::groups::GroupElement;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `absagl::groups::FiniteGroup`
[INFO] [stdout]   --> src/bin/main.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 | use absagl::groups::FiniteGroup;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `absagl::utils`
[INFO] [stdout]   --> src/bin/main.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 | use absagl::utils;
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `absagl::groups::factor::CosetSide`
[INFO] [stdout]   --> src/bin/main.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 23 | use absagl::groups::factor::CosetSide;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rayon::result`
[INFO] [stdout]   --> src/bin/main.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 | use rayon::result;
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::marker::PhantomData`
[INFO] [stdout]   --> src/bin/main.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 27 | use std::marker::PhantomData;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]   --> src/bin/main.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 28 | use std::collections::HashMap;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::iter::Cycle`
[INFO] [stdout]   --> src/bin/main.rs:29:5
[INFO] [stdout]    |
[INFO] [stdout] 29 | use std::iter::Cycle;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::pin`
[INFO] [stdout]   --> src/bin/main.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 30 | use std::pin;
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `debug`, `error`, `info`, and `warn`
[INFO] [stdout]   --> src/bin/main.rs:31:11
[INFO] [stdout]    |
[INFO] [stdout] 31 | use log::{info, warn, error, debug};
[INFO] [stdout]    |           ^^^^  ^^^^  ^^^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `absagl::groups::Group`
[INFO] [stdout]   --> src/bin/main.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | use absagl::groups::Group;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `absagl::groups::permutation::Permutation`
[INFO] [stdout]  --> tests/test_todo.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use absagl::groups::permutation::Permutation;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/main.rs:63:5
[INFO] [stdout]    |
[INFO] [stdout] 63 |     show!(hom.kernel(&z4, &identity_h));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this warning originates in the macro `show` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `absagl::error::AbsaglError`
[INFO] [stdout]  --> src/bin/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use absagl::error::AbsaglError;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `absagl::groups::dihedral::DihedralElement`
[INFO] [stdout]  --> src/bin/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use absagl::groups::dihedral::DihedralElement;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `absagl::groups::factor::Coset`
[INFO] [stdout]  --> src/bin/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use absagl::groups::factor::Coset;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `absagl::groups::factor::CosetError`
[INFO] [stdout]  --> src/bin/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use absagl::groups::factor::CosetError;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `absagl::groups::factor::FactorGroup`
[INFO] [stdout]  --> src/bin/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use absagl::groups::factor::FactorGroup;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `absagl::groups::permutation::AlternatingGroupElement`
[INFO] [stdout]  --> src/bin/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use absagl::groups::permutation::AlternatingGroupElement;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `absagl::groups::permutation::PermutationError`
[INFO] [stdout]  --> src/bin/main.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use absagl::groups::permutation::PermutationError;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `absagl::groups::CanonicalRepr`
[INFO] [stdout]   --> src/bin/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use absagl::groups::CanonicalRepr;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `absagl::groups::CheckedOp`
[INFO] [stdout]   --> src/bin/main.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | use absagl::groups::CheckedOp;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `absagl::groups::GroupElement`
[INFO] [stdout]   --> src/bin/main.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | use absagl::groups::GroupElement;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `absagl::groups::FiniteGroup`
[INFO] [stdout]   --> src/bin/main.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 | use absagl::groups::FiniteGroup;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `absagl::utils`
[INFO] [stdout]   --> src/bin/main.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 | use absagl::utils;
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `absagl::groups::factor::CosetSide`
[INFO] [stdout]   --> src/bin/main.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 23 | use absagl::groups::factor::CosetSide;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rayon::result`
[INFO] [stdout]   --> src/bin/main.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 | use rayon::result;
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::marker::PhantomData`
[INFO] [stdout]   --> src/bin/main.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 27 | use std::marker::PhantomData;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]   --> src/bin/main.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 28 | use std::collections::HashMap;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::iter::Cycle`
[INFO] [stdout]   --> src/bin/main.rs:29:5
[INFO] [stdout]    |
[INFO] [stdout] 29 | use std::iter::Cycle;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::pin`
[INFO] [stdout]   --> src/bin/main.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 30 | use std::pin;
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `debug`, `error`, `info`, and `warn`
[INFO] [stdout]   --> src/bin/main.rs:31:11
[INFO] [stdout]    |
[INFO] [stdout] 31 | use log::{info, warn, error, debug};
[INFO] [stdout]    |           ^^^^  ^^^^  ^^^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `absagl::groups::Group`
[INFO] [stdout]   --> src/bin/main.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | use absagl::groups::Group;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/main.rs:63:5
[INFO] [stdout]    |
[INFO] [stdout] 63 |     show!(hom.kernel(&z4, &identity_h));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this warning originates in the macro `show` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 10.75s
[INFO] running `Command { std: "docker" "inspect" "0139c15f5196edfb59249ea5e3cbda38881dc2c323e48b02ed2c9e662d651e90", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0139c15f5196edfb59249ea5e3cbda38881dc2c323e48b02ed2c9e662d651e90", kill_on_drop: false }`
[INFO] [stdout] 0139c15f5196edfb59249ea5e3cbda38881dc2c323e48b02ed2c9e662d651e90
