[INFO] cloning repository https://github.com/statianzo/imposters
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/statianzo/imposters" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fstatianzo%2Fimposters", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fstatianzo%2Fimposters'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 344a5027ba57464a424c1906376445b6e208cb57
[INFO] checking statianzo/imposters against try#b2c2190fa7bf856bb0ed5e8806266e3a2135c6f8 for pr-78363
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fstatianzo%2Fimposters" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/statianzo/imposters on toolchain b2c2190fa7bf856bb0ed5e8806266e3a2135c6f8
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b2c2190fa7bf856bb0ed5e8806266e3a2135c6f8" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/statianzo/imposters
[INFO] finished tweaking git repo https://github.com/statianzo/imposters
[INFO] tweaked toml for git repo https://github.com/statianzo/imposters written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/statianzo/imposters already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b2c2190fa7bf856bb0ed5e8806266e3a2135c6f8" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded quickcheck v0.6.2
[INFO] [stderr]   Downloaded log v0.4.3
[INFO] [stderr]   Downloaded regex-syntax v0.6.1
[INFO] [stderr]   Downloaded ucd-util v0.1.1
[INFO] [stderr]   Downloaded atty v0.2.10
[INFO] [stderr]   Downloaded humantime v1.1.1
[INFO] [stderr]   Downloaded aho-corasick v0.6.5
[INFO] [stderr]   Downloaded rand v0.4.2
[INFO] [stderr]   Downloaded bitflags v1.0.3
[INFO] [stderr]   Downloaded thread_local v0.3.5
[INFO] [stderr]   Downloaded rand v0.5.3
[INFO] [stderr]   Downloaded utf8-ranges v1.0.0
[INFO] [stderr]   Downloaded memchr v2.0.1
[INFO] [stderr]   Downloaded wincolor v0.1.6
[INFO] [stderr]   Downloaded libc v0.2.42
[INFO] [stderr]   Downloaded cfg-if v0.1.4
[INFO] [stderr]   Downloaded lazy_static v1.0.1
[INFO] [stderr]   Downloaded termcolor v0.3.6
[INFO] [stderr]   Downloaded env_logger v0.5.10
[INFO] [stderr]   Downloaded regex v1.0.1
[INFO] [stderr]   Downloaded winapi v0.3.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+b2c2190fa7bf856bb0ed5e8806266e3a2135c6f8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d5abbb20ebc74ff62902ff7d86316dd414422c8f000cdffc9b7eed0db5699c78
[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" "d5abbb20ebc74ff62902ff7d86316dd414422c8f000cdffc9b7eed0db5699c78", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d5abbb20ebc74ff62902ff7d86316dd414422c8f000cdffc9b7eed0db5699c78", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d5abbb20ebc74ff62902ff7d86316dd414422c8f000cdffc9b7eed0db5699c78", kill_on_drop: false }`
[INFO] [stdout] d5abbb20ebc74ff62902ff7d86316dd414422c8f000cdffc9b7eed0db5699c78
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+b2c2190fa7bf856bb0ed5e8806266e3a2135c6f8" "check" "--frozen" "--all" "--all-targets" "--message-format=json", 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] 7c85b9349fc6d8b607b451aee3a0f81af73263dbd5432a8e9ff24292556ab9a2
[INFO] running `Command { std: "docker" "start" "-a" "7c85b9349fc6d8b607b451aee3a0f81af73263dbd5432a8e9ff24292556ab9a2", kill_on_drop: false }`
[INFO] [stderr]     Checking libc v0.2.42
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]     Checking ucd-util v0.1.1
[INFO] [stderr]     Checking cfg-if v0.1.4
[INFO] [stderr]     Checking utf8-ranges v1.0.0
[INFO] [stderr]     Checking quick-error v1.2.2
[INFO] [stderr]     Checking termcolor v0.3.6
[INFO] [stderr]     Checking rand_core v0.2.1
[INFO] [stderr]     Checking imposters v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking log v0.4.3
[INFO] [stderr]     Checking unreachable v1.0.0
[INFO] [stderr]     Checking humantime v1.1.1
[INFO] [stderr]     Checking regex-syntax v0.6.1
[INFO] [stderr]     Checking thread_local v0.3.5
[INFO] [stderr]     Checking memchr v2.0.1
[INFO] [stderr]     Checking atty v0.2.10
[INFO] [stderr]     Checking rand v0.4.2
[INFO] [stderr]     Checking rand v0.5.3
[INFO] [stderr]     Checking aho-corasick v0.6.5
[INFO] [stderr]     Checking regex v1.0.1
[INFO] [stderr]     Checking env_logger v0.5.10
[INFO] [stderr]     Checking quickcheck v0.6.2
[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/ch08_adv_algs/fib.rs:78:26
[INFO] [stdout]    |
[INFO] [stdout] 78 |         let mut iter = a.into_iter();
[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: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 10.56s
[INFO] running `Command { std: "docker" "inspect" "7c85b9349fc6d8b607b451aee3a0f81af73263dbd5432a8e9ff24292556ab9a2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7c85b9349fc6d8b607b451aee3a0f81af73263dbd5432a8e9ff24292556ab9a2", kill_on_drop: false }`
[INFO] [stdout] 7c85b9349fc6d8b607b451aee3a0f81af73263dbd5432a8e9ff24292556ab9a2