[INFO] cloning repository https://github.com/ajcrites/monty_hall
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ajcrites/monty_hall" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fajcrites%2Fmonty_hall", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fajcrites%2Fmonty_hall'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 96f03e958a3950ba5cb6eab58f69260b1852032a
[INFO] checking ajcrites/monty_hall against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fajcrites%2Fmonty_hall" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ajcrites/monty_hall on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ajcrites/monty_hall
[INFO] finished tweaking git repo https://github.com/ajcrites/monty_hall
[INFO] tweaked toml for git repo https://github.com/ajcrites/monty_hall written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/ajcrites/monty_hall already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded advapi32-sys v0.1.2
[INFO] [stderr]   Downloaded num_cpus v0.2.10
[INFO] [stderr]   Downloaded libc v0.2.4
[INFO] [stderr]   Downloaded kernel32-sys v0.2.1
[INFO] [stderr]   Downloaded rand v0.3.11
[INFO] [stderr]   Downloaded winapi v0.2.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 078e9e6ee2e5dd0d1d2f504680a87286aab8b6a613a8d271498258eb4b7c7911
[INFO] running `Command { std: "docker" "start" "-a" "078e9e6ee2e5dd0d1d2f504680a87286aab8b6a613a8d271498258eb4b7c7911", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "078e9e6ee2e5dd0d1d2f504680a87286aab8b6a613a8d271498258eb4b7c7911", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "078e9e6ee2e5dd0d1d2f504680a87286aab8b6a613a8d271498258eb4b7c7911", kill_on_drop: false }`
[INFO] [stdout] 078e9e6ee2e5dd0d1d2f504680a87286aab8b6a613a8d271498258eb4b7c7911
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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" "RUSTDOCFLAGS=--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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f9c38c1423bb5cbab440b64d9298c76f1a367b3094405e95bf53b7704aef3b36
[INFO] running `Command { std: "docker" "start" "-a" "f9c38c1423bb5cbab440b64d9298c76f1a367b3094405e95bf53b7704aef3b36", kill_on_drop: false }`
[INFO] [stderr]    Compiling winapi-build v0.1.1
[INFO] [stderr]     Checking winapi v0.2.4
[INFO] [stderr]     Checking libc v0.2.4
[INFO] [stderr]     Checking libc v0.1.12
[INFO] [stderr]    Compiling kernel32-sys v0.2.1
[INFO] [stderr]    Compiling advapi32-sys v0.1.2
[INFO] [stderr]     Checking rand v0.3.11
[INFO] [stderr]     Checking num_cpus v0.2.10
[INFO] [stderr]     Checking monty_hall v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]   --> src/main.rs:64:14
[INFO] [stdout]    |
[INFO] [stdout] 64 |     for _ in (0..cpus) {
[INFO] [stdout]    |              ^       ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 64 -     for _ in (0..cpus) {
[INFO] [stdout] 64 +     for _ in 0..cpus {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]   --> src/main.rs:67:22
[INFO] [stdout]    |
[INFO] [stdout] 67 |             for _ in (0..1_000_000 / cpus) {
[INFO] [stdout]    |                      ^                   ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 67 -             for _ in (0..1_000_000 / cpus) {
[INFO] [stdout] 67 +             for _ in 0..1_000_000 / cpus {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]   --> src/main.rs:64:14
[INFO] [stdout]    |
[INFO] [stdout] 64 |     for _ in (0..cpus) {
[INFO] [stdout]    |              ^       ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 64 -     for _ in (0..cpus) {
[INFO] [stdout] 64 +     for _ in 0..cpus {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]   --> src/main.rs:67:22
[INFO] [stdout]    |
[INFO] [stdout] 67 |             for _ in (0..1_000_000 / cpus) {
[INFO] [stdout]    |                      ^                   ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 67 -             for _ in (0..1_000_000 / cpus) {
[INFO] [stdout] 67 +             for _ in 0..1_000_000 / cpus {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.60s
[INFO] running `Command { std: "docker" "inspect" "f9c38c1423bb5cbab440b64d9298c76f1a367b3094405e95bf53b7704aef3b36", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f9c38c1423bb5cbab440b64d9298c76f1a367b3094405e95bf53b7704aef3b36", kill_on_drop: false }`
[INFO] [stdout] f9c38c1423bb5cbab440b64d9298c76f1a367b3094405e95bf53b7704aef3b36