[INFO] cloning repository https://github.com/Ryan1729/markov_jukebox
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Ryan1729/markov_jukebox" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FRyan1729%2Fmarkov_jukebox", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FRyan1729%2Fmarkov_jukebox'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9c6c631a33a41ab937f9c0d9150775280a273a6a
[INFO] checking Ryan1729/markov_jukebox against master#d62d3f7fa9a91d933213cc10e20e740608983f64 for pr-77015
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FRyan1729%2Fmarkov_jukebox" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Ryan1729/markov_jukebox on toolchain d62d3f7fa9a91d933213cc10e20e740608983f64
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d62d3f7fa9a91d933213cc10e20e740608983f64" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Ryan1729/markov_jukebox
[INFO] finished tweaking git repo https://github.com/Ryan1729/markov_jukebox
[INFO] tweaked toml for git repo https://github.com/Ryan1729/markov_jukebox written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/Ryan1729/markov_jukebox already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d62d3f7fa9a91d933213cc10e20e740608983f64" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+d62d3f7fa9a91d933213cc10e20e740608983f64" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 242ee0fd538f76242faf64f304ae1d7eda8291ea93db6c1c7b071b6821374cba
[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" "242ee0fd538f76242faf64f304ae1d7eda8291ea93db6c1c7b071b6821374cba", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "242ee0fd538f76242faf64f304ae1d7eda8291ea93db6c1c7b071b6821374cba", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "242ee0fd538f76242faf64f304ae1d7eda8291ea93db6c1c7b071b6821374cba", kill_on_drop: false }`
[INFO] [stdout] 242ee0fd538f76242faf64f304ae1d7eda8291ea93db6c1c7b071b6821374cba
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+d62d3f7fa9a91d933213cc10e20e740608983f64" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 82bfd1dcfd3de79f6f3f837027acd7980032f286348253160755a55a3b1e5d1d
[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" "82bfd1dcfd3de79f6f3f837027acd7980032f286348253160755a55a3b1e5d1d", kill_on_drop: false }`
[INFO] [stderr]     Checking libc v0.2.29
[INFO] [stderr]     Checking unicode-segmentation v1.2.0
[INFO] [stderr]     Checking sample v0.6.2
[INFO] [stderr]     Checking find_folder v0.3.0
[INFO] [stderr]     Checking term_size v0.3.0
[INFO] [stderr]     Checking atty v0.2.2
[INFO] [stderr]     Checking rand v0.3.16
[INFO] [stderr]     Checking textwrap v0.7.0
[INFO] [stderr]     Checking clap v2.26.0
[INFO] [stderr]     Checking markov_jukebox v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/main.rs:113:22
[INFO] [stdout]     |
[INFO] [stdout] 113 |     let samples: Box<Iterator<Item = i16>> = if spec.bits_per_sample <= 16 {
[INFO] [stdout]     |                      ^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = i16>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/main.rs:113:22
[INFO] [stdout]     |
[INFO] [stdout] 113 |     let samples: Box<Iterator<Item = i16>> = if spec.bits_per_sample <= 16 {
[INFO] [stdout]     |                      ^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = i16>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 10.40s
[INFO] running `Command { std: "docker" "inspect" "82bfd1dcfd3de79f6f3f837027acd7980032f286348253160755a55a3b1e5d1d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "82bfd1dcfd3de79f6f3f837027acd7980032f286348253160755a55a3b1e5d1d", kill_on_drop: false }`
[INFO] [stdout] 82bfd1dcfd3de79f6f3f837027acd7980032f286348253160755a55a3b1e5d1d