[INFO] cloning repository https://github.com/Tazoeur/projecteuler
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Tazoeur/projecteuler" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTazoeur%2Fprojecteuler", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTazoeur%2Fprojecteuler'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d03ead78fbc180812af3d7b482dd9dd3e4c2125f
[INFO] testing Tazoeur/projecteuler against beta-2021-08-01 for beta-1.55-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTazoeur%2Fprojecteuler" "/workspace/builds/worker-45/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-45/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Tazoeur/projecteuler on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Tazoeur/projecteuler
[INFO] finished tweaking git repo https://github.com/Tazoeur/projecteuler
[INFO] tweaked toml for git repo https://github.com/Tazoeur/projecteuler written to /workspace/builds/worker-45/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded elastic-array-plus v0.10.0
[INFO] [stderr]   Downloaded etcommon-hexutil v0.2.4
[INFO] [stderr]   Downloaded etcommon-bigint v0.2.10
[INFO] [stderr]   Downloaded fraction v0.6.3
[INFO] [stderr]   Downloaded etcommon-rlp v0.2.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-45/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-45/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e83db669210f88cf7aa2bd9efd84404b22b84096100e17af15800918823d5c36
[INFO] running `Command { std: "docker" "start" "-a" "e83db669210f88cf7aa2bd9efd84404b22b84096100e17af15800918823d5c36", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e83db669210f88cf7aa2bd9efd84404b22b84096100e17af15800918823d5c36", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e83db669210f88cf7aa2bd9efd84404b22b84096100e17af15800918823d5c36", kill_on_drop: false }`
[INFO] [stdout] e83db669210f88cf7aa2bd9efd84404b22b84096100e17af15800918823d5c36
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-45/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-45/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=warn" "-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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1085f4e1787e6a1a0923a6efe4aece1c990f1e2b45f3108ff5fcb826b208cbb1
[INFO] running `Command { std: "docker" "start" "-a" "1085f4e1787e6a1a0923a6efe4aece1c990f1e2b45f3108ff5fcb826b208cbb1", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.28
[INFO] [stderr]    Compiling libc v0.2.98
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.74
[INFO] [stderr]    Compiling memchr v2.4.0
[INFO] [stderr]    Compiling cc v1.0.69
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]    Compiling adler v1.0.2
[INFO] [stderr]    Compiling gimli v0.25.0
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling rustc-demangle v0.1.20
[INFO] [stderr]    Compiling elastic-array-plus v0.10.0
[INFO] [stderr]    Compiling etcommon-hexutil v0.2.4
[INFO] [stderr]    Compiling byteorder v1.4.3
[INFO] [stderr]    Compiling svg v0.5.12
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling num-bigint v0.2.6
[INFO] [stderr]    Compiling miniz_oxide v0.4.4
[INFO] [stderr]    Compiling num-complex v0.2.4
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]    Compiling num-rational v0.2.4
[INFO] [stderr]    Compiling etcommon-rlp v0.2.5
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling object v0.26.0
[INFO] [stderr]    Compiling backtrace v0.3.61
[INFO] [stderr]    Compiling rand v0.4.6
[INFO] [stderr]    Compiling rand v0.3.23
[INFO] [stderr]    Compiling etcommon-bigint v0.2.10
[INFO] [stderr]    Compiling addr2line v0.16.0
[INFO] [stderr]    Compiling num v0.2.1
[INFO] [stderr]    Compiling fraction v0.6.3
[INFO] [stderr]    Compiling synstructure v0.12.5
[INFO] [stderr]    Compiling failure v0.1.8
[INFO] [stderr]    Compiling plotlib v0.4.0
[INFO] [stderr]    Compiling projecteuler v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `result` is never read
[INFO] [stdout]   --> src/hugeint/mod.rs:28:17
[INFO] [stdout]    |
[INFO] [stdout] 28 |         let mut result = 0;
[INFO] [stdout]    |                 ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `self_value` is never read
[INFO] [stdout]   --> src/hugeint/mod.rs:31:17
[INFO] [stdout]    |
[INFO] [stdout] 31 |         let mut self_value = 0;
[INFO] [stdout]    |                 ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `n_value` is never read
[INFO] [stdout]   --> src/hugeint/mod.rs:32:17
[INFO] [stdout]    |
[INFO] [stdout] 32 |         let mut n_value = 0;
[INFO] [stdout]    |                 ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `report` is never read
[INFO] [stdout]   --> src/hugeint/mod.rs:56:13
[INFO] [stdout]    |
[INFO] [stdout] 56 |             report = 0;
[INFO] [stdout]    |             ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]   --> src/hugeint/mod.rs:76:17
[INFO] [stdout]    |
[INFO] [stdout] 76 |             for v in 0..value {
[INFO] [stdout]    |                 ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `j`
[INFO] [stdout]   --> src/hugeint/mod.rs:80:17
[INFO] [stdout]    |
[INFO] [stdout] 80 |             for j in 0..i {
[INFO] [stdout]    |                 ^ help: if this is intentional, prefix it with an underscore: `_j`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/hugeint/mod.rs:97:13
[INFO] [stdout]    |
[INFO] [stdout] 97 |         for i in 1..n {
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `total` is never read
[INFO] [stdout]  --> src/coin_sums.rs:6:13
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let mut total: u64 = 0;
[INFO] [stdout]   |             ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `p_str` is never read
[INFO] [stdout]   --> src/pandigital_products.rs:80:13
[INFO] [stdout]    |
[INFO] [stdout] 80 |     let mut p_str = String::new();
[INFO] [stdout]    |             ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tu`
[INFO] [stdout]    --> src/pandigital_products.rs:145:10
[INFO] [stdout]     |
[INFO] [stdout] 145 |     for (tu, p) in &tab {
[INFO] [stdout]     |          ^^ help: if this is intentional, prefix it with an underscore: `_tu`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tab`
[INFO] [stdout]  --> src/quadratic_primes.rs:4:13
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let mut tab: Vec<(i64, i64)> = Vec::new();
[INFO] [stdout]   |             ^^^ help: if this is intentional, prefix it with an underscore: `_tab`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `n` is never read
[INFO] [stdout]  --> src/quadratic_primes.rs:6:13
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let mut n: u64 = 0;
[INFO] [stdout]   |             ^
[INFO] [stdout]   |
[INFO] [stdout]   = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `eq` is never read
[INFO] [stdout]  --> src/quadratic_primes.rs:7:13
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let mut eq: i64 = 0;
[INFO] [stdout]   |             ^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `abs_eq` is never read
[INFO] [stdout]  --> src/quadratic_primes.rs:8:13
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let mut abs_eq: u64 = 0;
[INFO] [stdout]   |             ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/quadratic_primes.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let mut tab: Vec<(i64, i64)> = Vec::new();
[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: unused `Result` that must be used
[INFO] [stdout]   --> src/digit_fifth_powers.rs:50:5
[INFO] [stdout]    |
[INFO] [stdout] 50 |     Page::single(&v).save("scatter.svg");
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 16 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `lib_euler::utils::math`
[INFO] [stdout]  --> src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use lib_euler::utils::math;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 13.75s
[INFO] running `Command { std: "docker" "inspect" "1085f4e1787e6a1a0923a6efe4aece1c990f1e2b45f3108ff5fcb826b208cbb1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1085f4e1787e6a1a0923a6efe4aece1c990f1e2b45f3108ff5fcb826b208cbb1", kill_on_drop: false }`
[INFO] [stdout] 1085f4e1787e6a1a0923a6efe4aece1c990f1e2b45f3108ff5fcb826b208cbb1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-45/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-45/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=warn" "-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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e772ee3d93647b011c7449b1a086c59a1989892d7a8051173def7985f2ce488a
[INFO] running `Command { std: "docker" "start" "-a" "e772ee3d93647b011c7449b1a086c59a1989892d7a8051173def7985f2ce488a", kill_on_drop: false }`
[INFO] [stderr]    Compiling projecteuler v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `result` is never read
[INFO] [stdout]   --> src/hugeint/mod.rs:28:17
[INFO] [stdout]    |
[INFO] [stdout] 28 |         let mut result = 0;
[INFO] [stdout]    |                 ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `self_value` is never read
[INFO] [stdout]   --> src/hugeint/mod.rs:31:17
[INFO] [stdout]    |
[INFO] [stdout] 31 |         let mut self_value = 0;
[INFO] [stdout]    |                 ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `n_value` is never read
[INFO] [stdout]   --> src/hugeint/mod.rs:32:17
[INFO] [stdout]    |
[INFO] [stdout] 32 |         let mut n_value = 0;
[INFO] [stdout]    |                 ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `report` is never read
[INFO] [stdout]   --> src/hugeint/mod.rs:56:13
[INFO] [stdout]    |
[INFO] [stdout] 56 |             report = 0;
[INFO] [stdout]    |             ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]   --> src/hugeint/mod.rs:76:17
[INFO] [stdout]    |
[INFO] [stdout] 76 |             for v in 0..value {
[INFO] [stdout]    |                 ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `j`
[INFO] [stdout]   --> src/hugeint/mod.rs:80:17
[INFO] [stdout]    |
[INFO] [stdout] 80 |             for j in 0..i {
[INFO] [stdout]    |                 ^ help: if this is intentional, prefix it with an underscore: `_j`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/hugeint/mod.rs:97:13
[INFO] [stdout]    |
[INFO] [stdout] 97 |         for i in 1..n {
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `total` is never read
[INFO] [stdout]  --> src/coin_sums.rs:6:13
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let mut total: u64 = 0;
[INFO] [stdout]   |             ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `p_str` is never read
[INFO] [stdout]   --> src/pandigital_products.rs:80:13
[INFO] [stdout]    |
[INFO] [stdout] 80 |     let mut p_str = String::new();
[INFO] [stdout]    |             ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tu`
[INFO] [stdout]    --> src/pandigital_products.rs:145:10
[INFO] [stdout]     |
[INFO] [stdout] 145 |     for (tu, p) in &tab {
[INFO] [stdout]     |          ^^ help: if this is intentional, prefix it with an underscore: `_tu`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tab`
[INFO] [stdout]  --> src/quadratic_primes.rs:4:13
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let mut tab: Vec<(i64, i64)> = Vec::new();
[INFO] [stdout]   |             ^^^ help: if this is intentional, prefix it with an underscore: `_tab`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `n` is never read
[INFO] [stdout]  --> src/quadratic_primes.rs:6:13
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let mut n: u64 = 0;
[INFO] [stdout]   |             ^
[INFO] [stdout]   |
[INFO] [stdout]   = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `eq` is never read
[INFO] [stdout]  --> src/quadratic_primes.rs:7:13
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let mut eq: i64 = 0;
[INFO] [stdout]   |             ^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `abs_eq` is never read
[INFO] [stdout]  --> src/quadratic_primes.rs:8:13
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let mut abs_eq: u64 = 0;
[INFO] [stdout]   |             ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/quadratic_primes.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let mut tab: Vec<(i64, i64)> = Vec::new();
[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: unused `Result` that must be used
[INFO] [stdout]   --> src/digit_fifth_powers.rs:50:5
[INFO] [stdout]    |
[INFO] [stdout] 50 |     Page::single(&v).save("scatter.svg");
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 16 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `lib_euler::utils::math`
[INFO] [stdout]  --> src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use lib_euler::utils::math;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `result` is never read
[INFO] [stdout]   --> src/hugeint/mod.rs:28:17
[INFO] [stdout]    |
[INFO] [stdout] 28 |         let mut result = 0;
[INFO] [stdout]    |                 ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `self_value` is never read
[INFO] [stdout]   --> src/hugeint/mod.rs:31:17
[INFO] [stdout]    |
[INFO] [stdout] 31 |         let mut self_value = 0;
[INFO] [stdout]    |                 ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `n_value` is never read
[INFO] [stdout]   --> src/hugeint/mod.rs:32:17
[INFO] [stdout]    |
[INFO] [stdout] 32 |         let mut n_value = 0;
[INFO] [stdout]    |                 ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `report` is never read
[INFO] [stdout]   --> src/hugeint/mod.rs:56:13
[INFO] [stdout]    |
[INFO] [stdout] 56 |             report = 0;
[INFO] [stdout]    |             ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]   --> src/hugeint/mod.rs:76:17
[INFO] [stdout]    |
[INFO] [stdout] 76 |             for v in 0..value {
[INFO] [stdout]    |                 ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `j`
[INFO] [stdout]   --> src/hugeint/mod.rs:80:17
[INFO] [stdout]    |
[INFO] [stdout] 80 |             for j in 0..i {
[INFO] [stdout]    |                 ^ help: if this is intentional, prefix it with an underscore: `_j`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/hugeint/mod.rs:97:13
[INFO] [stdout]    |
[INFO] [stdout] 97 |         for i in 1..n {
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `total` is never read
[INFO] [stdout]  --> src/coin_sums.rs:6:13
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let mut total: u64 = 0;
[INFO] [stdout]   |             ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `p_str` is never read
[INFO] [stdout]   --> src/pandigital_products.rs:80:13
[INFO] [stdout]    |
[INFO] [stdout] 80 |     let mut p_str = String::new();
[INFO] [stdout]    |             ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tu`
[INFO] [stdout]    --> src/pandigital_products.rs:145:10
[INFO] [stdout]     |
[INFO] [stdout] 145 |     for (tu, p) in &tab {
[INFO] [stdout]     |          ^^ help: if this is intentional, prefix it with an underscore: `_tu`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tab`
[INFO] [stdout]  --> src/quadratic_primes.rs:4:13
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let mut tab: Vec<(i64, i64)> = Vec::new();
[INFO] [stdout]   |             ^^^ help: if this is intentional, prefix it with an underscore: `_tab`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `n` is never read
[INFO] [stdout]  --> src/quadratic_primes.rs:6:13
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let mut n: u64 = 0;
[INFO] [stdout]   |             ^
[INFO] [stdout]   |
[INFO] [stdout]   = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `eq` is never read
[INFO] [stdout]  --> src/quadratic_primes.rs:7:13
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let mut eq: i64 = 0;
[INFO] [stdout]   |             ^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `abs_eq` is never read
[INFO] [stdout]  --> src/quadratic_primes.rs:8:13
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let mut abs_eq: u64 = 0;
[INFO] [stdout]   |             ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/quadratic_primes.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let mut tab: Vec<(i64, i64)> = Vec::new();
[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: unused `Result` that must be used
[INFO] [stdout]   --> src/digit_fifth_powers.rs:50:5
[INFO] [stdout]    |
[INFO] [stdout] 50 |     Page::single(&v).save("scatter.svg");
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 16 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.76s
[INFO] running `Command { std: "docker" "inspect" "e772ee3d93647b011c7449b1a086c59a1989892d7a8051173def7985f2ce488a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e772ee3d93647b011c7449b1a086c59a1989892d7a8051173def7985f2ce488a", kill_on_drop: false }`
[INFO] [stdout] e772ee3d93647b011c7449b1a086c59a1989892d7a8051173def7985f2ce488a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-45/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-45/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=warn" "-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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 3d44d44284b78cd77d7a41f3b68f34d7e17814c24ab3283077b4e1b767c20b53
[INFO] running `Command { std: "docker" "start" "-a" "3d44d44284b78cd77d7a41f3b68f34d7e17814c24ab3283077b4e1b767c20b53", kill_on_drop: false }`
[INFO] [stderr] warning: value assigned to `result` is never read
[INFO] [stderr]   --> src/hugeint/mod.rs:28:17
[INFO] [stderr]    |
[INFO] [stderr] 28 |         let mut result = 0;
[INFO] [stderr]    |                 ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `self_value` is never read
[INFO] [stderr]   --> src/hugeint/mod.rs:31:17
[INFO] [stderr]    |
[INFO] [stderr] 31 |         let mut self_value = 0;
[INFO] [stderr]    |                 ^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `n_value` is never read
[INFO] [stderr]   --> src/hugeint/mod.rs:32:17
[INFO] [stderr]    |
[INFO] [stderr] 32 |         let mut n_value = 0;
[INFO] [stderr]    |                 ^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `report` is never read
[INFO] [stderr]   --> src/hugeint/mod.rs:56:13
[INFO] [stderr]    |
[INFO] [stderr] 56 |             report = 0;
[INFO] [stderr]    |             ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `v`
[INFO] [stderr]   --> src/hugeint/mod.rs:76:17
[INFO] [stderr]    |
[INFO] [stderr] 76 |             for v in 0..value {
[INFO] [stderr]    |                 ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `j`
[INFO] [stderr]   --> src/hugeint/mod.rs:80:17
[INFO] [stderr]    |
[INFO] [stderr] 80 |             for j in 0..i {
[INFO] [stderr]    |                 ^ help: if this is intentional, prefix it with an underscore: `_j`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]   --> src/hugeint/mod.rs:97:13
[INFO] [stderr]    |
[INFO] [stderr] 97 |         for i in 1..n {
[INFO] [stderr]    |             ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `total` is never read
[INFO] [stderr]  --> src/coin_sums.rs:6:13
[INFO] [stderr]   |
[INFO] [stderr] 6 |     let mut total: u64 = 0;
[INFO] [stderr]   |             ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `p_str` is never read
[INFO] [stderr]   --> src/pandigital_products.rs:80:13
[INFO] [stderr]    |
[INFO] [stderr] 80 |     let mut p_str = String::new();
[INFO] [stderr]    |             ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `tu`
[INFO] [stderr]    --> src/pandigital_products.rs:145:10
[INFO] [stderr]     |
[INFO] [stderr] 145 |     for (tu, p) in &tab {
[INFO] [stderr]     |          ^^ help: if this is intentional, prefix it with an underscore: `_tu`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `tab`
[INFO] [stderr]  --> src/quadratic_primes.rs:4:13
[INFO] [stderr]   |
[INFO] [stderr] 4 |     let mut tab: Vec<(i64, i64)> = Vec::new();
[INFO] [stderr]   |             ^^^ help: if this is intentional, prefix it with an underscore: `_tab`
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `n` is never read
[INFO] [stderr]  --> src/quadratic_primes.rs:6:13
[INFO] [stderr]   |
[INFO] [stderr] 6 |     let mut n: u64 = 0;
[INFO] [stderr]   |             ^
[INFO] [stderr]   |
[INFO] [stderr]   = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `eq` is never read
[INFO] [stderr]  --> src/quadratic_primes.rs:7:13
[INFO] [stderr]   |
[INFO] [stderr] 7 |     let mut eq: i64 = 0;
[INFO] [stderr]   |             ^^
[INFO] [stderr]   |
[INFO] [stderr]   = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `abs_eq` is never read
[INFO] [stderr]  --> src/quadratic_primes.rs:8:13
[INFO] [stderr]   |
[INFO] [stderr] 8 |     let mut abs_eq: u64 = 0;
[INFO] [stderr]   |             ^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]  --> src/quadratic_primes.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 |     let mut tab: Vec<(i64, i64)> = Vec::new();
[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: unused `Result` that must be used
[INFO] [stderr]   --> src/digit_fifth_powers.rs:50:5
[INFO] [stderr]    |
[INFO] [stderr] 50 |     Page::single(&v).save("scatter.svg");
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: `projecteuler` (lib) generated 16 warnings
[INFO] [stderr] warning: `projecteuler` (lib test) generated 16 warnings (16 duplicates)
[INFO] [stderr] warning: unused import: `lib_euler::utils::math`
[INFO] [stderr]  --> src/main.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use lib_euler::utils::math;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `projecteuler` (bin "projecteuler" test) generated 1 warning
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/lib_euler-25df2715b544bb3e)
[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] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/projecteuler-7688ce5b2d59f238)
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests lib_euler
[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] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test src/utils/math.rs - utils::math::combinatorics_combination (line 50) ... FAILED
[INFO] [stdout] test src/utils/math.rs - utils::math::combinatorics_permutation (line 98) ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- src/utils/math.rs - utils::math::combinatorics_combination (line 50) stdout ----
[INFO] [stdout] error: `and` is not a logical operator
[INFO] [stdout]  --> src/utils/math.rs:51:16
[INFO] [stdout]   |
[INFO] [stdout] 3 | ex : let p = 2 and elements = [1, 2, 3, 4, 5]; the result will be
[INFO] [stdout]   |                ^^^ help: use `&&` to perform logical conjunction
[INFO] [stdout]   |
[INFO] [stdout]   = note: unlike in e.g., python and PHP, `&&` and `||` are used for logical operators
[INFO] [stdout] 
[INFO] [stdout] error: expected identifier, found keyword `let`
[INFO] [stdout]  --> src/utils/math.rs:51:6
[INFO] [stdout]   |
[INFO] [stdout] 3 | ex : let p = 2 and elements = [1, 2, 3, 4, 5]; the result will be
[INFO] [stdout]   |      ^^^ expected identifier, found keyword
[INFO] [stdout] 
[INFO] [stdout] error: expected type, found keyword `let`
[INFO] [stdout]  --> src/utils/math.rs:51:6
[INFO] [stdout]   |
[INFO] [stdout] 3 | ex : let p = 2 and elements = [1, 2, 3, 4, 5]; the result will be
[INFO] [stdout]   |    - ^^^ expected type
[INFO] [stdout]   |    |
[INFO] [stdout]   |    tried to parse a type due to this
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: `let` expressions in this position are experimental
[INFO] [stdout]  --> src/utils/math.rs:51:6
[INFO] [stdout]   |
[INFO] [stdout] 3 | ex : let p = 2 and elements = [1, 2, 3, 4, 5]; the result will be
[INFO] [stdout]   |      ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
[INFO] [stdout]   = help: you can write `matches!(<expr>, <pattern>)` instead of `let <pattern> = <expr>`
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 previous errors
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0658`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/utils/math.rs - utils::math::combinatorics_permutation (line 98) stdout ----
[INFO] [stdout] error: `and` is not a logical operator
[INFO] [stdout]  --> src/utils/math.rs:99:16
[INFO] [stdout]   |
[INFO] [stdout] 3 | ex : let p = 2 and elements = [1, 2, 3, 4, 5]; the result will be
[INFO] [stdout]   |                ^^^ help: use `&&` to perform logical conjunction
[INFO] [stdout]   |
[INFO] [stdout]   = note: unlike in e.g., python and PHP, `&&` and `||` are used for logical operators
[INFO] [stdout] 
[INFO] [stdout] error: expected identifier, found keyword `let`
[INFO] [stdout]  --> src/utils/math.rs:99:6
[INFO] [stdout]   |
[INFO] [stdout] 3 | ex : let p = 2 and elements = [1, 2, 3, 4, 5]; the result will be
[INFO] [stdout]   |      ^^^ expected identifier, found keyword
[INFO] [stdout] 
[INFO] [stdout] error: expected type, found keyword `let`
[INFO] [stdout]  --> src/utils/math.rs:99:6
[INFO] [stdout]   |
[INFO] [stdout] 3 | ex : let p = 2 and elements = [1, 2, 3, 4, 5]; the result will be
[INFO] [stdout]   |    - ^^^ expected type
[INFO] [stdout]   |    |
[INFO] [stdout]   |    tried to parse a type due to this
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: `let` expressions in this position are experimental
[INFO] [stdout]  --> src/utils/math.rs:99:6
[INFO] [stdout]   |
[INFO] [stdout] 3 | ex : let p = 2 and elements = [1, 2, 3, 4, 5]; the result will be
[INFO] [stdout]   |      ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
[INFO] [stdout]   = help: you can write `matches!(<expr>, <pattern>)` instead of `let <pattern> = <expr>`
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 previous errors
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0658`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     src/utils/math.rs - utils::math::combinatorics_combination (line 50)
[INFO] [stdout]     src/utils/math.rs - utils::math::combinatorics_permutation (line 98)
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 0 passed; 2 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.07s
[INFO] [stdout] 
[INFO] [stderr] error: test failed, to rerun pass '--doc'
[INFO] running `Command { std: "docker" "inspect" "3d44d44284b78cd77d7a41f3b68f34d7e17814c24ab3283077b4e1b767c20b53", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3d44d44284b78cd77d7a41f3b68f34d7e17814c24ab3283077b4e1b767c20b53", kill_on_drop: false }`
[INFO] [stdout] 3d44d44284b78cd77d7a41f3b68f34d7e17814c24ab3283077b4e1b767c20b53
