[INFO] updating cached repository emallson/max-cover-rs
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/emallson/max-cover-rs
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/emallson/max-cover-rs" "work/ex/pr-63247/sources/master#452087b4bf18cece2d52d7cd8c9147195e5404bf/gh/emallson/max-cover-rs"`
[INFO] [stderr] Cloning into 'work/ex/pr-63247/sources/master#452087b4bf18cece2d52d7cd8c9147195e5404bf/gh/emallson/max-cover-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/emallson/max-cover-rs" "work/ex/pr-63247/sources/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/gh/emallson/max-cover-rs"`
[INFO] [stderr] Cloning into 'work/ex/pr-63247/sources/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/gh/emallson/max-cover-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] e41bc5578b5abc677bfda9bb8176f9be6fd96801
[INFO] sha for GitHub repo emallson/max-cover-rs: e41bc5578b5abc677bfda9bb8176f9be6fd96801
[INFO] validating manifest of emallson/max-cover-rs on toolchain master#452087b4bf18cece2d52d7cd8c9147195e5404bf
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+452087b4bf18cece2d52d7cd8c9147195e5404bf-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of emallson/max-cover-rs on toolchain try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+757dacae0a9f1b46b3ab58a1f1232332e8fc7dab-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing emallson/max-cover-rs
[INFO] finished frobbing emallson/max-cover-rs
[INFO] frobbed toml for emallson/max-cover-rs written to work/ex/pr-63247/sources/master#452087b4bf18cece2d52d7cd8c9147195e5404bf/gh/emallson/max-cover-rs/Cargo.toml
[INFO] started frobbing emallson/max-cover-rs
[INFO] finished frobbing emallson/max-cover-rs
[INFO] frobbed toml for emallson/max-cover-rs written to work/ex/pr-63247/sources/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/gh/emallson/max-cover-rs/Cargo.toml
[INFO] crate emallson/max-cover-rs already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+452087b4bf18cece2d52d7cd8c9147195e5404bf-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+757dacae0a9f1b46b3ab58a1f1232332e8fc7dab-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] checking emallson/max-cover-rs against master#452087b4bf18cece2d52d7cd8c9147195e5404bf for pr-63247
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-63247/worker-3/master#452087b4bf18cece2d52d7cd8c9147195e5404bf:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-63247/sources/master#452087b4bf18cece2d52d7cd8c9147195e5404bf/gh/emallson/max-cover-rs:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+452087b4bf18cece2d52d7cd8c9147195e5404bf-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 5b3ffb8221e4bcd8f3042942b52bd634c63606d1655015023fdb5a4a41db9987
[INFO] running `"docker" "start" "-a" "5b3ffb8221e4bcd8f3042942b52bd634c63606d1655015023fdb5a4a41db9987"`
[INFO] [stderr]     Checking serde v0.9.5
[INFO] [stderr]     Checking dtoa v0.4.0
[INFO] [stderr]     Checking itoa v0.3.0
[INFO] [stderr]    Compiling rplex v0.1.0 (https://github.com/emallson/rplex.git#c4d88bcc)
[INFO] [stderr]    Compiling serde_codegen_internals v0.12.1
[INFO] [stderr]    Compiling serde_derive v0.9.5
[INFO] [stderr]     Checking serde_json v0.9.3
[INFO] [stderr]     Checking cover v0.1.0 (/opt/crater/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 18.35s
[INFO] running `"docker" "inspect" "5b3ffb8221e4bcd8f3042942b52bd634c63606d1655015023fdb5a4a41db9987"`
[INFO] running `"docker" "rm" "-f" "5b3ffb8221e4bcd8f3042942b52bd634c63606d1655015023fdb5a4a41db9987"`
[INFO] [stdout] 5b3ffb8221e4bcd8f3042942b52bd634c63606d1655015023fdb5a4a41db9987