[INFO] cloning repository https://github.com/matklad/group-by-challenge [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/matklad/group-by-challenge" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmatklad%2Fgroup-by-challenge", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmatklad%2Fgroup-by-challenge'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 297c95d461427a61f621767443897c37bef43f0f [INFO] checking matklad/group-by-challenge against master#db1fb85cff63ad5fffe435e17128f99f9e1d970c for pr-89056 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmatklad%2Fgroup-by-challenge" "/workspace/builds/worker-118/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-118/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/matklad/group-by-challenge on toolchain db1fb85cff63ad5fffe435e17128f99f9e1d970c [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/matklad/group-by-challenge [INFO] finished tweaking git repo https://github.com/matklad/group-by-challenge [INFO] tweaked toml for git repo https://github.com/matklad/group-by-challenge written to /workspace/builds/worker-118/source/Cargo.toml [INFO] crate git repo https://github.com/matklad/group-by-challenge already has a lockfile, it will not be regenerated [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-118/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-118/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] f13703ce999fa10eb493cf9670819cf25ff795589a8e35c7eda476a780627f78 [INFO] running `Command { std: "docker" "start" "-a" "f13703ce999fa10eb493cf9670819cf25ff795589a8e35c7eda476a780627f78", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "f13703ce999fa10eb493cf9670819cf25ff795589a8e35c7eda476a780627f78", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "f13703ce999fa10eb493cf9670819cf25ff795589a8e35c7eda476a780627f78", kill_on_drop: false }` [INFO] [stdout] f13703ce999fa10eb493cf9670819cf25ff795589a8e35c7eda476a780627f78 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-118/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-118/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" "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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 611d9b666949d841ba40ff0eaab9551dbe93f5f13c31432294f3f3d12568afaa [INFO] running `Command { std: "docker" "start" "-a" "611d9b666949d841ba40ff0eaab9551dbe93f5f13c31432294f3f3d12568afaa", kill_on_drop: false }` [INFO] [stderr] Checking group-by-challenge v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused variable: `xs` [INFO] [stdout] --> src/lib.rs:1:29 [INFO] [stdout] | [INFO] [stdout] 1 | pub fn group_by(xs: I, key_fn: F) -> Vec<(K, Vec)> [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_xs` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `key_fn` [INFO] [stdout] --> src/lib.rs:1:36 [INFO] [stdout] | [INFO] [stdout] 1 | pub fn group_by(xs: I, key_fn: F) -> Vec<(K, Vec)> [INFO] [stdout] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_key_fn` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `xs` [INFO] [stdout] --> src/lib.rs:1:29 [INFO] [stdout] | [INFO] [stdout] 1 | pub fn group_by(xs: I, key_fn: F) -> Vec<(K, Vec)> [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_xs` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `key_fn` [INFO] [stdout] --> src/lib.rs:1:36 [INFO] [stdout] | [INFO] [stdout] 1 | pub fn group_by(xs: I, key_fn: F) -> Vec<(K, Vec)> [INFO] [stdout] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_key_fn` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 0.49s [INFO] running `Command { std: "docker" "inspect" "611d9b666949d841ba40ff0eaab9551dbe93f5f13c31432294f3f3d12568afaa", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "611d9b666949d841ba40ff0eaab9551dbe93f5f13c31432294f3f3d12568afaa", kill_on_drop: false }` [INFO] [stdout] 611d9b666949d841ba40ff0eaab9551dbe93f5f13c31432294f3f3d12568afaa