[INFO] cloning 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" "clone" "--bare" "https://github.com/cowang4/rusty_primes" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcowang4%2Frusty_primes", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcowang4%2Frusty_primes'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 21bc62830ae1854e493e277aa730cb01c23bc4b6
[INFO] checking cowang4/rusty_primes against try#39e1293fce4b650061e85dda88aa428f726a8444 for pr-88041
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcowang4%2Frusty_primes" "/workspace/builds/worker-44/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-44/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/cowang4/rusty_primes on toolchain 39e1293fce4b650061e85dda88aa428f726a8444
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+39e1293fce4b650061e85dda88aa428f726a8444" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", 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-44/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" "+39e1293fce4b650061e85dda88aa428f726a8444" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-44/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-44/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" "+39e1293fce4b650061e85dda88aa428f726a8444" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 51cf99776228c2df16e28e2f59ae5d7e7d16af3363775b21149d79aa4fa68e2b
[INFO] running `Command { std: "docker" "start" "-a" "51cf99776228c2df16e28e2f59ae5d7e7d16af3363775b21149d79aa4fa68e2b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "51cf99776228c2df16e28e2f59ae5d7e7d16af3363775b21149d79aa4fa68e2b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "51cf99776228c2df16e28e2f59ae5d7e7d16af3363775b21149d79aa4fa68e2b", kill_on_drop: false }`
[INFO] [stdout] 51cf99776228c2df16e28e2f59ae5d7e7d16af3363775b21149d79aa4fa68e2b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-44/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-44/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" "+39e1293fce4b650061e85dda88aa428f726a8444" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1ac7391e88b348ab54698d920591ae986f7a6d23e33606e4a208690e11df0ce4
[INFO] running `Command { std: "docker" "start" "-a" "1ac7391e88b348ab54698d920591ae986f7a6d23e33606e4a208690e11df0ce4", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking rusty_primes v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused return value of `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 `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 `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 `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 1.17s
[INFO] running `Command { std: "docker" "inspect" "1ac7391e88b348ab54698d920591ae986f7a6d23e33606e4a208690e11df0ce4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1ac7391e88b348ab54698d920591ae986f7a6d23e33606e4a208690e11df0ce4", kill_on_drop: false }`
[INFO] [stdout] 1ac7391e88b348ab54698d920591ae986f7a6d23e33606e4a208690e11df0ce4