[INFO] updating cached repository https://github.com/emallson/max-cover-rs
[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] e41bc5578b5abc677bfda9bb8176f9be6fd96801
[INFO] checking emallson/max-cover-rs against master#2748a9fd93dd1a00a4521f4f16de5befbf77f6cd for pr-62262-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Femallson%2Fmax-cover-rs" "/workspace/builds/worker-9/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/emallson/max-cover-rs on toolchain 2748a9fd93dd1a00a4521f4f16de5befbf77f6cd
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/emallson/max-cover-rs
[INFO] finished tweaking git repo https://github.com/emallson/max-cover-rs
[INFO] tweaked toml for git repo https://github.com/emallson/max-cover-rs written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/emallson/max-cover-rs already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "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] 87c9448becdf6269c8ae59ede228ec19c13389b3a67cef215b9975b04d00b1ea
[INFO] running `"docker" "start" "-a" "87c9448becdf6269c8ae59ede228ec19c13389b3a67cef215b9975b04d00b1ea"`
[INFO] [stderr]    Compiling quote v0.3.12
[INFO] [stderr]     Checking serde v0.9.5
[INFO] [stderr]     Checking dtoa v0.4.0
[INFO] [stderr]     Checking itoa v0.3.0
[INFO] [stderr]     Checking memchr v1.0.1
[INFO] [stderr]    Compiling rplex v0.1.0 (https://github.com/emallson/rplex.git#c4d88bcc)
[INFO] [stderr]     Checking aho-corasick v0.6.1
[INFO] [stderr]    Compiling syn v0.11.4
[INFO] [stderr]     Checking regex v0.2.1
[INFO] [stderr]    Compiling serde_codegen_internals v0.12.1
[INFO] [stderr]     Checking docopt v0.7.0
[INFO] [stderr]    Compiling serde_derive v0.9.5
[INFO] [stderr]     Checking serde_json v0.9.3
[INFO] [stderr]     Checking cover v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused `#[macro_use]` import
[INFO] [stderr]  --> src/main.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | #[macro_use]
[INFO] [stderr]   | ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Rng`
[INFO] [stderr]   --> src/main.rs:13:32
[INFO] [stderr]    |
[INFO] [stderr] 13 | use rand::{thread_rng, sample, Rng};
[INFO] [stderr]    |                                ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around function argument
[INFO] [stderr]    --> src/main.rs:131:45
[INFO] [stderr]     |
[INFO] [stderr] 131 |     prob.add_constraint(con!("cardinality": (k as f64) >= sum set_vars.iter())).unwrap();
[INFO] [stderr]     |                                             ^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `#[macro_use]` import
[INFO] [stderr]  --> src/main.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | #[macro_use]
[INFO] [stderr]   | ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Rng`
[INFO] [stderr]   --> src/main.rs:13:32
[INFO] [stderr]    |
[INFO] [stderr] 13 | use rand::{thread_rng, sample, Rng};
[INFO] [stderr]    |                                ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around function argument
[INFO] [stderr]    --> src/main.rs:131:45
[INFO] [stderr]     |
[INFO] [stderr] 131 |     prob.add_constraint(con!("cardinality": (k as f64) >= sum set_vars.iter())).unwrap();
[INFO] [stderr]     |                                             ^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 29.12s
[INFO] running `"docker" "inspect" "87c9448becdf6269c8ae59ede228ec19c13389b3a67cef215b9975b04d00b1ea"`
[INFO] running `"docker" "rm" "-f" "87c9448becdf6269c8ae59ede228ec19c13389b3a67cef215b9975b04d00b1ea"`
[INFO] [stdout] 87c9448becdf6269c8ae59ede228ec19c13389b3a67cef215b9975b04d00b1ea