[INFO] updating cached repository https://github.com/PlasmaPower/random-walk
[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] 4c3be3cb2aee6f580185c50dbbc60c3aabe38750
[INFO] checking PlasmaPower/random-walk against try#5fdfba63a96c5e8ae0ebf6b8b66853110277087d for pr-73166
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPlasmaPower%2Frandom-walk" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/PlasmaPower/random-walk on toolchain 5fdfba63a96c5e8ae0ebf6b8b66853110277087d
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5fdfba63a96c5e8ae0ebf6b8b66853110277087d" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/PlasmaPower/random-walk
[INFO] finished tweaking git repo https://github.com/PlasmaPower/random-walk
[INFO] tweaked toml for git repo https://github.com/PlasmaPower/random-walk written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/PlasmaPower/random-walk already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5fdfba63a96c5e8ae0ebf6b8b66853110277087d" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "+5fdfba63a96c5e8ae0ebf6b8b66853110277087d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 0f271b4bc94969fad2928ca233389f006ecf940b5e7bb87f7084a4256a995104
[INFO] running `Command { std: "docker" "start" "-a" "0f271b4bc94969fad2928ca233389f006ecf940b5e7bb87f7084a4256a995104", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0f271b4bc94969fad2928ca233389f006ecf940b5e7bb87f7084a4256a995104", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0f271b4bc94969fad2928ca233389f006ecf940b5e7bb87f7084a4256a995104", kill_on_drop: false }`
[INFO] [stdout] 0f271b4bc94969fad2928ca233389f006ecf940b5e7bb87f7084a4256a995104
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "+5fdfba63a96c5e8ae0ebf6b8b66853110277087d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a0e4295dda805e2e6fe9634006358638a70315fd626d27c4a734b9c165cb4a92
[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" "a0e4295dda805e2e6fe9634006358638a70315fd626d27c4a734b9c165cb4a92", kill_on_drop: false }`
[INFO] [stderr]     Checking libc v0.2.23
[INFO] [stderr]     Checking strsim v0.6.0
[INFO] [stderr]     Checking ansi_term v0.9.0
[INFO] [stderr]     Checking yaml-rust v0.3.5
[INFO] [stderr]     Checking vec_map v0.8.0
[INFO] [stderr]     Checking bitflags v0.8.2
[INFO] [stderr]     Checking unicode-segmentation v1.2.0
[INFO] [stderr]     Checking unicode-width v0.1.4
[INFO] [stderr]     Checking fnv v1.0.5
[INFO] [stderr]     Checking lazy_static v0.2.8
[INFO] [stderr]     Checking term_size v0.3.0
[INFO] [stderr]     Checking atty v0.2.2
[INFO] [stderr]     Checking rand v0.3.15
[INFO] [stderr]     Checking clap v2.24.2
[INFO] [stderr]     Checking random-walk v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/main.rs:51:30
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn random_walk(mut rng: &mut Rng, starting_room: &Room) -> u8 {
[INFO] [stdout]    |                              ^^^ help: use `dyn`: `dyn Rng`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'std::sync::ONCE_INIT': the `new` function is now preferred
[INFO] [stdout]   --> src/main.rs:38:1
[INFO] [stdout]    |
[INFO] [stdout] 38 | / lazy_static! {
[INFO] [stdout] 39 | |     static ref ROOMS: HashMap<&'static str, Room> = {
[INFO] [stdout] 40 | |         let mut map = HashMap::new();
[INFO] [stdout] 41 | |         map.insert("A", Room::new(vec!["F", "D"]));
[INFO] [stdout] ...  |
[INFO] [stdout] 48 | |     };
[INFO] [stdout] 49 | | }
[INFO] [stdout]    | |_^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'std::sync::ONCE_INIT': the `new` function is now preferred
[INFO] [stdout]   --> src/main.rs:38:1
[INFO] [stdout]    |
[INFO] [stdout] 38 | / lazy_static! {
[INFO] [stdout] 39 | |     static ref ROOMS: HashMap<&'static str, Room> = {
[INFO] [stdout] 40 | |         let mut map = HashMap::new();
[INFO] [stdout] 41 | |         map.insert("A", Room::new(vec!["F", "D"]));
[INFO] [stdout] ...  |
[INFO] [stdout] 48 | |     };
[INFO] [stdout] 49 | | }
[INFO] [stdout]    | |_^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/main.rs:51:30
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn random_walk(mut rng: &mut Rng, starting_room: &Room) -> u8 {
[INFO] [stdout]    |                              ^^^ help: use `dyn`: `dyn Rng`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'std::sync::ONCE_INIT': the `new` function is now preferred
[INFO] [stdout]   --> src/main.rs:38:1
[INFO] [stdout]    |
[INFO] [stdout] 38 | / lazy_static! {
[INFO] [stdout] 39 | |     static ref ROOMS: HashMap<&'static str, Room> = {
[INFO] [stdout] 40 | |         let mut map = HashMap::new();
[INFO] [stdout] 41 | |         map.insert("A", Room::new(vec!["F", "D"]));
[INFO] [stdout] ...  |
[INFO] [stdout] 48 | |     };
[INFO] [stdout] 49 | | }
[INFO] [stdout]    | |_^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'std::sync::ONCE_INIT': the `new` function is now preferred
[INFO] [stdout]   --> src/main.rs:38:1
[INFO] [stdout]    |
[INFO] [stdout] 38 | / lazy_static! {
[INFO] [stdout] 39 | |     static ref ROOMS: HashMap<&'static str, Room> = {
[INFO] [stdout] 40 | |         let mut map = HashMap::new();
[INFO] [stdout] 41 | |         map.insert("A", Room::new(vec!["F", "D"]));
[INFO] [stdout] ...  |
[INFO] [stdout] 48 | |     };
[INFO] [stdout] 49 | | }
[INFO] [stdout]    | |_^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this method call currently resolves to `<&[T; N] as IntoIterator>::into_iter` (due to autoref coercions), but that might change in the future when `IntoIterator` impls for arrays are added.
[INFO] [stdout]    --> src/main.rs:109:52
[INFO] [stdout]     |
[INFO] [stdout] 109 |                 for (index, count) in small_counts.into_iter().enumerate() {
[INFO] [stdout]     |                                                    ^^^^^^^^^ help: use `.iter()` instead of `.into_iter()` to avoid ambiguity: `iter`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(array_into_iter)]` on by default
[INFO] [stdout]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]     = note: for more information, see issue #66145 <https://github.com/rust-lang/rust/issues/66145>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this method call currently resolves to `<&[T; N] as IntoIterator>::into_iter` (due to autoref coercions), but that might change in the future when `IntoIterator` impls for arrays are added.
[INFO] [stdout]    --> src/main.rs:109:52
[INFO] [stdout]     |
[INFO] [stdout] 109 |                 for (index, count) in small_counts.into_iter().enumerate() {
[INFO] [stdout]     |                                                    ^^^^^^^^^ help: use `.iter()` instead of `.into_iter()` to avoid ambiguity: `iter`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(array_into_iter)]` on by default
[INFO] [stdout]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]     = note: for more information, see issue #66145 <https://github.com/rust-lang/rust/issues/66145>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 9.35s
[INFO] running `Command { std: "docker" "inspect" "a0e4295dda805e2e6fe9634006358638a70315fd626d27c4a734b9c165cb4a92", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a0e4295dda805e2e6fe9634006358638a70315fd626d27c4a734b9c165cb4a92", kill_on_drop: false }`
[INFO] [stdout] a0e4295dda805e2e6fe9634006358638a70315fd626d27c4a734b9c165cb4a92