[INFO] updating cached repository https://github.com/cowang4/rusty_primes
[INFO] running `Command { std: "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", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 46fb5675b79a855986e1a69094d78689c1557b62
[INFO] checking cowang4/rusty_primes against try#22dd2dd1dc07f63ae9394352d412f020d2985684 for pr-74627
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcowang4%2Frusty_primes" "/workspace/builds/worker-12/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/cowang4/rusty_primes on toolchain 22dd2dd1dc07f63ae9394352d412f020d2985684
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+22dd2dd1dc07f63ae9394352d412f020d2985684" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/cowang4/rusty_primes
[INFO] finished tweaking git repo https://github.com/cowang4/rusty_primes
[INFO] tweaked toml for git repo https://github.com/cowang4/rusty_primes written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/cowang4/rusty_primes already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+22dd2dd1dc07f63ae9394352d412f020d2985684" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+22dd2dd1dc07f63ae9394352d412f020d2985684" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8ddf2251f8048ae0d1a069c419b509f03baae100f69d50f0956b4eb2d6637ee9
[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" "8ddf2251f8048ae0d1a069c419b509f03baae100f69d50f0956b4eb2d6637ee9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8ddf2251f8048ae0d1a069c419b509f03baae100f69d50f0956b4eb2d6637ee9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8ddf2251f8048ae0d1a069c419b509f03baae100f69d50f0956b4eb2d6637ee9", kill_on_drop: false }`
[INFO] [stdout] 8ddf2251f8048ae0d1a069c419b509f03baae100f69d50f0956b4eb2d6637ee9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+22dd2dd1dc07f63ae9394352d412f020d2985684" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7611a93426c19e881775419a55a13410aaf5a55ace2fecee7a8658104cd3b092
[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" "7611a93426c19e881775419a55a13410aaf5a55ace2fecee7a8658104cd3b092", kill_on_drop: false }`
[INFO] [stderr]     Checking rusty_primes v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused return value of `std::iter::Iterator::collect` that must be used
[INFO] [stdout]   --> src/main.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 | /         ((i*i)..n)
[INFO] [stdout] 15 | |             .step_by(i)
[INFO] [stdout] 16 | |             .map(|i| primes[i] = false)
[INFO] [stdout] 17 | |             .collect::<()>();
[INFO] [stdout]    | |_____________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::iter::Iterator::collect` that must be used
[INFO] [stdout]   --> src/main.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 30 | /     primes
[INFO] [stdout] 31 | |         .iter()
[INFO] [stdout] 32 | |         .map(|i| println!("{}", i))
[INFO] [stdout] 33 | |         .collect::<()>();
[INFO] [stdout]    | |_________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::iter::Iterator::collect` that must be used
[INFO] [stdout]   --> src/main.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 | /         ((i*i)..n)
[INFO] [stdout] 15 | |             .step_by(i)
[INFO] [stdout] 16 | |             .map(|i| primes[i] = false)
[INFO] [stdout] 17 | |             .collect::<()>();
[INFO] [stdout]    | |_____________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::iter::Iterator::collect` that must be used
[INFO] [stdout]   --> src/main.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 30 | /     primes
[INFO] [stdout] 31 | |         .iter()
[INFO] [stdout] 32 | |         .map(|i| println!("{}", i))
[INFO] [stdout] 33 | |         .collect::<()>();
[INFO] [stdout]    | |_________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.64s
[INFO] running `Command { std: "docker" "inspect" "7611a93426c19e881775419a55a13410aaf5a55ace2fecee7a8658104cd3b092", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7611a93426c19e881775419a55a13410aaf5a55ace2fecee7a8658104cd3b092", kill_on_drop: false }`
[INFO] [stdout] 7611a93426c19e881775419a55a13410aaf5a55ace2fecee7a8658104cd3b092