[INFO] cloning repository https://github.com/olafurkarl/leetcode_rust [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/olafurkarl/leetcode_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Folafurkarl%2Fleetcode_rust", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Folafurkarl%2Fleetcode_rust'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 1c47aecf8d9c092f8c426a29c337272fafec91ce [INFO] checking olafurkarl/leetcode_rust against master#8007b506ac5da629f223b755f5a5391edd5f6d01 for pr-88041 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Folafurkarl%2Fleetcode_rust" "/workspace/builds/worker-6/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/olafurkarl/leetcode_rust on toolchain 8007b506ac5da629f223b755f5a5391edd5f6d01 [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8007b506ac5da629f223b755f5a5391edd5f6d01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/olafurkarl/leetcode_rust [INFO] finished tweaking git repo https://github.com/olafurkarl/leetcode_rust [INFO] tweaked toml for git repo https://github.com/olafurkarl/leetcode_rust written to /workspace/builds/worker-6/source/Cargo.toml [INFO] crate git repo https://github.com/olafurkarl/leetcode_rust already has a lockfile, it will not be regenerated [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8007b506ac5da629f223b755f5a5391edd5f6d01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "+8007b506ac5da629f223b755f5a5391edd5f6d01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 3f07a5b3aeac3a124649f50ef71a751065bddee34743fdea62a7813edd9e51ab [INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] running `Command { std: "docker" "start" "-a" "3f07a5b3aeac3a124649f50ef71a751065bddee34743fdea62a7813edd9e51ab", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "3f07a5b3aeac3a124649f50ef71a751065bddee34743fdea62a7813edd9e51ab", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "3f07a5b3aeac3a124649f50ef71a751065bddee34743fdea62a7813edd9e51ab", kill_on_drop: false }` [INFO] [stdout] 3f07a5b3aeac3a124649f50ef71a751065bddee34743fdea62a7813edd9e51ab [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+8007b506ac5da629f223b755f5a5391edd5f6d01" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 76b2fda83f16815d3c876e1ef99f6734255a1de93f0ed294a2be727b23d27b6e [INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] running `Command { std: "docker" "start" "-a" "76b2fda83f16815d3c876e1ef99f6734255a1de93f0ed294a2be727b23d27b6e", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] Checking leetcode v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused variable: `i` [INFO] [stdout] --> src/licence_key_formatter/licence_key_formatter.rs:17:14 [INFO] [stdout] | [INFO] [stdout] 17 | for (i, c) in s.chars().rev().enumerate() { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `serialize` [INFO] [stdout] --> src/tree_serializer/tree_serializer.rs:37:8 [INFO] [stdout] | [INFO] [stdout] 37 | fn serialize(&self, root: Option>>) -> String { [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `deserialize` [INFO] [stdout] --> src/tree_serializer/tree_serializer.rs:78:8 [INFO] [stdout] | [INFO] [stdout] 78 | fn deserialize(&self, data: String) -> Option>> { [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: struct is never constructed: `Solution` [INFO] [stdout] --> src/unique_email_addresses/unique_email_addresses.rs:22:8 [INFO] [stdout] | [INFO] [stdout] 22 | struct Solution { [INFO] [stdout] | ^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `num_unique_emails` [INFO] [stdout] --> src/unique_email_addresses/unique_email_addresses.rs:26:12 [INFO] [stdout] | [INFO] [stdout] 26 | pub fn num_unique_emails(emails: Vec) -> i32 { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `strip_extra_chars` [INFO] [stdout] --> src/unique_email_addresses/unique_email_addresses.rs:29:12 [INFO] [stdout] | [INFO] [stdout] 29 | fn strip_extra_chars (email: String) -> String { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: struct is never constructed: `Solution` [INFO] [stdout] --> src/licence_key_formatter/licence_key_formatter.rs:9:8 [INFO] [stdout] | [INFO] [stdout] 9 | struct Solution { [INFO] [stdout] | ^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `license_key_formatting` [INFO] [stdout] --> src/licence_key_formatter/licence_key_formatter.rs:14:12 [INFO] [stdout] | [INFO] [stdout] 14 | pub fn license_key_formatting(s: String, k: i32) -> String { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 8 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `i` [INFO] [stdout] --> src/licence_key_formatter/licence_key_formatter.rs:17:14 [INFO] [stdout] | [INFO] [stdout] 17 | for (i, c) in s.chars().rev().enumerate() { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` 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 0.82s [INFO] running `Command { std: "docker" "inspect" "76b2fda83f16815d3c876e1ef99f6734255a1de93f0ed294a2be727b23d27b6e", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "76b2fda83f16815d3c876e1ef99f6734255a1de93f0ed294a2be727b23d27b6e", kill_on_drop: false }` [INFO] [stdout] 76b2fda83f16815d3c876e1ef99f6734255a1de93f0ed294a2be727b23d27b6e