[INFO] updating cached repository https://github.com/pymongo/rust_leetcode
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 9c8724e8d0217b6c444a2eb8e3722663de23177c
[INFO] checking pymongo/rust_leetcode against master#45d050cde277b22a755847338f2acc2c7b834141 for pr-71393
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpymongo%2Frust_leetcode" "/workspace/builds/worker-0/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/pymongo/rust_leetcode on toolchain 45d050cde277b22a755847338f2acc2c7b834141
[INFO] running `"/workspace/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/pymongo/rust_leetcode
[INFO] finished tweaking git repo https://github.com/pymongo/rust_leetcode
[INFO] tweaked toml for git repo https://github.com/pymongo/rust_leetcode written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 512decd8260b4fc8609475d7bb80cfdc65008da90f6cbf4340a9fc02f81a5c3f
[INFO] running `"docker" "start" "-a" "512decd8260b4fc8609475d7bb80cfdc65008da90f6cbf4340a9fc02f81a5c3f"`
[INFO] [stderr]     Checking rust_leetcode v0.0.1 (/opt/rustwide/workdir)
[INFO] [stderr] warning: comparison is useless due to type limits
[INFO] [stderr]   --> src/string/longest_substr_common.rs:14:15
[INFO] [stderr]    |
[INFO] [stderr] 14 |         while (i >= 0) && (j >= 0) {
[INFO] [stderr]    |               ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_comparisons)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: comparison is useless due to type limits
[INFO] [stderr]   --> src/string/longest_substr_common.rs:14:27
[INFO] [stderr]    |
[INFO] [stderr] 14 |         while (i >= 0) && (j >= 0) {
[INFO] [stderr]    |                           ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `dp`
[INFO] [stderr]  --> src/string/longest_substr_common.rs:3:4
[INFO] [stderr]   |
[INFO] [stderr] 3 | fn dp(s1: String, s2: String) -> usize {
[INFO] [stderr]   |    ^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]  --> src/lib.rs:4:4
[INFO] [stderr]   |
[INFO] [stderr] 4 | fn main() {
[INFO] [stderr]   |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: comparison is useless due to type limits
[INFO] [stderr]   --> src/string/longest_substr_common.rs:14:15
[INFO] [stderr]    |
[INFO] [stderr] 14 |         while (i >= 0) && (j >= 0) {
[INFO] [stderr]    |               ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_comparisons)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: comparison is useless due to type limits
[INFO] [stderr]   --> src/string/longest_substr_common.rs:14:27
[INFO] [stderr]    |
[INFO] [stderr] 14 |         while (i >= 0) && (j >= 0) {
[INFO] [stderr]    |                           ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 4 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.64s
[INFO] running `"docker" "inspect" "512decd8260b4fc8609475d7bb80cfdc65008da90f6cbf4340a9fc02f81a5c3f"`
[INFO] running `"docker" "rm" "-f" "512decd8260b4fc8609475d7bb80cfdc65008da90f6cbf4340a9fc02f81a5c3f"`
[INFO] [stdout] 512decd8260b4fc8609475d7bb80cfdc65008da90f6cbf4340a9fc02f81a5c3f