[INFO] cloning repository https://github.com/susan-tu/rust-book-exercises
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/susan-tu/rust-book-exercises" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsusan-tu%2Frust-book-exercises", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsusan-tu%2Frust-book-exercises'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 519cdd9aec859ec823552009fa8460a3c7610701
[INFO] testing susan-tu/rust-book-exercises against master#cdb45c87e2cd43495379f7e867e3cc15dcee9f93 for pr-145838-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsusan-tu%2Frust-book-exercises" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/susan-tu/rust-book-exercises
[INFO] finished tweaking git repo https://github.com/susan-tu/rust-book-exercises
[INFO] tweaked toml for git repo https://github.com/susan-tu/rust-book-exercises written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/susan-tu/rust-book-exercises on toolchain cdb45c87e2cd43495379f7e867e3cc15dcee9f93
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/susan-tu/rust-book-exercises 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" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fa4d939530ca7ad0f8cf840f0d0713bce8975cebc5f1fc54929d577c213d543a
[INFO] running `Command { std: "docker" "start" "-a" "fa4d939530ca7ad0f8cf840f0d0713bce8975cebc5f1fc54929d577c213d543a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fa4d939530ca7ad0f8cf840f0d0713bce8975cebc5f1fc54929d577c213d543a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fa4d939530ca7ad0f8cf840f0d0713bce8975cebc5f1fc54929d577c213d543a", kill_on_drop: false }`
[INFO] [stdout] fa4d939530ca7ad0f8cf840f0d0713bce8975cebc5f1fc54929d577c213d543a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5ab96ba1ccdd7eaf873dc2da8b6735c0ff5eeae397dc7a7e0c6bccdf75438803
[INFO] running `Command { std: "docker" "start" "-a" "5ab96ba1ccdd7eaf873dc2da8b6735c0ff5eeae397dc7a7e0c6bccdf75438803", kill_on_drop: false }`
[INFO] [stderr]    Compiling approx v0.5.0
[INFO] [stderr]    Compiling exercises v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: found module declaration for lib.rs
[INFO] [stdout]   --> main.rs:14:1
[INFO] [stdout]    |
[INFO] [stdout] 14 | mod lib;
[INFO] [stdout]    | ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: lib.rs is the root of this crate's library target
[INFO] [stdout]    = help: to refer to it from other targets, use the library's name as the path
[INFO] [stdout]    = note: `#[warn(special_module_name)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.36s
[INFO] running `Command { std: "docker" "inspect" "5ab96ba1ccdd7eaf873dc2da8b6735c0ff5eeae397dc7a7e0c6bccdf75438803", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5ab96ba1ccdd7eaf873dc2da8b6735c0ff5eeae397dc7a7e0c6bccdf75438803", kill_on_drop: false }`
[INFO] [stdout] 5ab96ba1ccdd7eaf873dc2da8b6735c0ff5eeae397dc7a7e0c6bccdf75438803
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7219dcde7fdd88de73ff92bfb253286cfd40705bd54661f1eaa5c9f8f84fa3af
[INFO] running `Command { std: "docker" "start" "-a" "7219dcde7fdd88de73ff92bfb253286cfd40705bd54661f1eaa5c9f8f84fa3af", kill_on_drop: false }`
[INFO] [stderr]    Compiling exercises v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: found module declaration for lib.rs
[INFO] [stdout]   --> main.rs:14:1
[INFO] [stdout]    |
[INFO] [stdout] 14 | mod lib;
[INFO] [stdout]    | ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: lib.rs is the root of this crate's library target
[INFO] [stdout]    = help: to refer to it from other targets, use the library's name as the path
[INFO] [stdout]    = note: `#[warn(special_module_name)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `Relative::<A, B>::eq` that must be used
[INFO] [stdout]   --> lib.rs:99:9
[INFO] [stdout]    |
[INFO] [stdout] 99 |         relative_eq!(mean, 3.83333, epsilon = f32::EPSILON);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 99 |         let _ = relative_eq!(mean, 3.83333, epsilon = f32::EPSILON);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `Relative::<A, B>::eq` that must be used
[INFO] [stdout]    --> lib.rs:108:9
[INFO] [stdout]     |
[INFO] [stdout] 108 |         relative_eq!(mean, 2.0, epsilon = f32::EPSILON);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 108 |         let _ = relative_eq!(mean, 2.0, epsilon = f32::EPSILON);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `Relative::<A, B>::eq` that must be used
[INFO] [stdout]   --> lib.rs:99:9
[INFO] [stdout]    |
[INFO] [stdout] 99 |         relative_eq!(mean, 3.83333, epsilon = f32::EPSILON);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 99 |         let _ = relative_eq!(mean, 3.83333, epsilon = f32::EPSILON);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `Relative::<A, B>::eq` that must be used
[INFO] [stdout]    --> lib.rs:108:9
[INFO] [stdout]     |
[INFO] [stdout] 108 |         relative_eq!(mean, 2.0, epsilon = f32::EPSILON);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 108 |         let _ = relative_eq!(mean, 2.0, epsilon = f32::EPSILON);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.56s
[INFO] running `Command { std: "docker" "inspect" "7219dcde7fdd88de73ff92bfb253286cfd40705bd54661f1eaa5c9f8f84fa3af", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7219dcde7fdd88de73ff92bfb253286cfd40705bd54661f1eaa5c9f8f84fa3af", kill_on_drop: false }`
[INFO] [stdout] 7219dcde7fdd88de73ff92bfb253286cfd40705bd54661f1eaa5c9f8f84fa3af
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 6d0981ac7762460a6950675c31a844a5cf08ce1dc68b241c173eeb12bec78cf5
[INFO] running `Command { std: "docker" "start" "-a" "6d0981ac7762460a6950675c31a844a5cf08ce1dc68b241c173eeb12bec78cf5", kill_on_drop: false }`
[INFO] [stderr] warning: found module declaration for lib.rs
[INFO] [stderr]   --> main.rs:14:1
[INFO] [stderr]    |
[INFO] [stderr] 14 | mod lib;
[INFO] [stderr]    | ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: lib.rs is the root of this crate's library target
[INFO] [stderr]    = help: to refer to it from other targets, use the library's name as the path
[INFO] [stderr]    = note: `#[warn(special_module_name)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `Relative::<A, B>::eq` that must be used
[INFO] [stderr]   --> lib.rs:99:9
[INFO] [stderr]    |
[INFO] [stderr] 99 |         relative_eq!(mean, 3.83333, epsilon = f32::EPSILON);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]    |
[INFO] [stderr] 99 |         let _ = relative_eq!(mean, 3.83333, epsilon = f32::EPSILON);
[INFO] [stderr]    |         +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `Relative::<A, B>::eq` that must be used
[INFO] [stderr]    --> lib.rs:108:9
[INFO] [stderr]     |
[INFO] [stderr] 108 |         relative_eq!(mean, 2.0, epsilon = f32::EPSILON);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 108 |         let _ = relative_eq!(mean, 2.0, epsilon = f32::EPSILON);
[INFO] [stderr]     |         +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: `exercises` (bin "exercises" test) generated 3 warnings
[INFO] [stderr] warning: `exercises` (lib test) generated 2 warnings (2 duplicates)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running unittests lib.rs (/opt/rustwide/target/debug/deps/exercises-b0b54d01317f218d)
[INFO] [stdout] 
[INFO] [stdout] running 3 tests
[INFO] [stdout] test tests::it_calculates_mean_median_mode ... ok
[INFO] [stdout] test tests::it_calculates_mean_median_mode_of_empty_list ... ok
[INFO] [stdout] test tests::it_calculates_mean_median_mode_of_single_elem_list ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests main.rs (/opt/rustwide/target/debug/deps/exercises-7d9842ad79fc0252)
[INFO] [stdout] 
[INFO] [stdout] running 3 tests
[INFO] [stdout] test lib::tests::it_calculates_mean_median_mode ... ok
[INFO] [stdout] test lib::tests::it_calculates_mean_median_mode_of_empty_list ... ok
[INFO] [stderr]    Doc-tests exercises
[INFO] [stdout] test lib::tests::it_calculates_mean_median_mode_of_single_elem_list ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "6d0981ac7762460a6950675c31a844a5cf08ce1dc68b241c173eeb12bec78cf5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6d0981ac7762460a6950675c31a844a5cf08ce1dc68b241c173eeb12bec78cf5", kill_on_drop: false }`
[INFO] [stdout] 6d0981ac7762460a6950675c31a844a5cf08ce1dc68b241c173eeb12bec78cf5