[INFO] cloning repository https://github.com/and-mora/rust-playground
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/and-mora/rust-playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fand-mora%2Frust-playground", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fand-mora%2Frust-playground'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d11aad468b0246119bb66b5a502524c7e40426a2
[INFO] checking and-mora/rust-playground against master#9f48dedc9763334a587c66558974635807a113ed for pr-137394
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fand-mora%2Frust-playground" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/and-mora/rust-playground on toolchain 9f48dedc9763334a587c66558974635807a113ed
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+9f48dedc9763334a587c66558974635807a113ed" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/and-mora/rust-playground
[INFO] finished tweaking git repo https://github.com/and-mora/rust-playground
[INFO] tweaked toml for git repo https://github.com/and-mora/rust-playground written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/and-mora/rust-playground 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" "+9f48dedc9763334a587c66558974635807a113ed" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr] note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr] note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr] note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[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@sha256:3959728d45483eb673ba100a951a6b9f5012970368db2a9e08e0ac9b67c8a5ad" "/opt/rustwide/cargo-home/bin/cargo" "+9f48dedc9763334a587c66558974635807a113ed" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 23e8ddd1f5c70d71397f8c46a56b5e63c8a2d7cac167fc2b887e9eea4e328bfc
[INFO] running `Command { std: "docker" "start" "-a" "23e8ddd1f5c70d71397f8c46a56b5e63c8a2d7cac167fc2b887e9eea4e328bfc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "23e8ddd1f5c70d71397f8c46a56b5e63c8a2d7cac167fc2b887e9eea4e328bfc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "23e8ddd1f5c70d71397f8c46a56b5e63c8a2d7cac167fc2b887e9eea4e328bfc", kill_on_drop: false }`
[INFO] [stdout] 23e8ddd1f5c70d71397f8c46a56b5e63c8a2d7cac167fc2b887e9eea4e328bfc
[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@sha256:3959728d45483eb673ba100a951a6b9f5012970368db2a9e08e0ac9b67c8a5ad" "/opt/rustwide/cargo-home/bin/cargo" "+9f48dedc9763334a587c66558974635807a113ed" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2e4474c9e6315af5c119349dbfc256ee4f336cdecbe5dca86c5dda78c6005dec
[INFO] running `Command { std: "docker" "start" "-a" "2e4474c9e6315af5c119349dbfc256ee4f336cdecbe5dca86c5dda78c6005dec", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr] note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr] note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr] note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling libc v0.2.141
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.17
[INFO] [stderr]     Checking rawpointer v0.2.1
[INFO] [stderr]     Checking collatz_theorem v0.1.0 (/opt/rustwide/workdir/collatz_theorem)
[INFO] [stderr]     Checking comprehensive_day_2_afternoon v0.1.0 (/opt/rustwide/workdir/comprehensive_day_2_afternoon)
[INFO] [stderr]     Checking comprehensive_day_2_morning_points_polygons v0.1.0 (/opt/rustwide/workdir/comprehensive_day_2_morning_points_polygons)
[INFO] [stderr]     Checking comprehensive_day_1_afternoon v0.1.0 (/opt/rustwide/workdir/comprehensive_day_1_afternoon)
[INFO] [stderr]     Checking comprehensive_day_2_morning_health_stats v0.1.0 (/opt/rustwide/workdir/comprehensive_day_2_morning_health_stats)
[INFO] [stdout] warning: function `collatz_iterative` is never used
[INFO] [stdout]   --> collatz_theorem/src/main.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn collatz_iterative(number: u128) -> u128 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]   --> comprehensive_day_1_afternoon/src/main.rs:78:9
[INFO] [stdout]    |
[INFO] [stdout] 55 | /         return self.books.iter().fold(self.books.first(), |mut state, x| {
[INFO] [stdout] 56 | |             // each iteration, we check the oldest between the state and the current
[INFO] [stdout] 57 | |             if state.unwrap().year > x.year {
[INFO] [stdout] 58 | |                 state = Some(x);
[INFO] [stdout] 59 | |             }
[INFO] [stdout] 60 | |             state
[INFO] [stdout] 61 | |         });
[INFO] [stdout]    | |__________- any code following this expression is unreachable
[INFO] [stdout] ...
[INFO] [stdout] 78 |           self.books.iter().min_by_key(|book| book.year)
[INFO] [stdout]    |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable expression
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `collatz_iterative` is never used
[INFO] [stdout]   --> collatz_theorem/src/main.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn collatz_iterative(number: u128) -> u128 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]   --> comprehensive_day_1_afternoon/src/main.rs:78:9
[INFO] [stdout]    |
[INFO] [stdout] 55 | /         return self.books.iter().fold(self.books.first(), |mut state, x| {
[INFO] [stdout] 56 | |             // each iteration, we check the oldest between the state and the current
[INFO] [stdout] 57 | |             if state.unwrap().year > x.year {
[INFO] [stdout] 58 | |                 state = Some(x);
[INFO] [stdout] 59 | |             }
[INFO] [stdout] 60 | |             state
[INFO] [stdout] 61 | |         });
[INFO] [stdout]    | |__________- any code following this expression is unreachable
[INFO] [stdout] ...
[INFO] [stdout] 78 |           self.books.iter().min_by_key(|book| book.year)
[INFO] [stdout]    |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable expression
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking matrixmultiply v0.3.2
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]     Checking getrandom v0.2.9
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking num-complex v0.4.3
[INFO] [stderr]     Checking ndarray v0.15.6
[INFO] [stderr]     Checking guessing_game v0.1.0 (/opt/rustwide/workdir/guessing_game)
[INFO] [stderr]     Checking comprehensive_day_1_morning v0.1.0 (/opt/rustwide/workdir/comprehensive_day_1_morning)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 6.55s
[INFO] running `Command { std: "docker" "inspect" "2e4474c9e6315af5c119349dbfc256ee4f336cdecbe5dca86c5dda78c6005dec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2e4474c9e6315af5c119349dbfc256ee4f336cdecbe5dca86c5dda78c6005dec", kill_on_drop: false }`
[INFO] [stdout] 2e4474c9e6315af5c119349dbfc256ee4f336cdecbe5dca86c5dda78c6005dec