[INFO] cloning repository https://github.com/limpid-kzonix/rust-playground
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/limpid-kzonix/rust-playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flimpid-kzonix%2Frust-playground", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flimpid-kzonix%2Frust-playground'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] db77dc0c8bc1c1a53e469afbcc263f27ce68e151
[INFO] checking limpid-kzonix/rust-playground/db77dc0c8bc1c1a53e469afbcc263f27ce68e151 against master#b56aaec52bc0fa35591a872fb4aac81f606e265c for pr-122661-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flimpid-kzonix%2Frust-playground" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/limpid-kzonix/rust-playground
[INFO] finished tweaking git repo https://github.com/limpid-kzonix/rust-playground
[INFO] tweaked toml for git repo https://github.com/limpid-kzonix/rust-playground written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/limpid-kzonix/rust-playground on toolchain b56aaec52bc0fa35591a872fb4aac81f606e265c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b56aaec52bc0fa35591a872fb4aac81f606e265c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/limpid-kzonix/rust-playground 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" "+b56aaec52bc0fa35591a872fb4aac81f606e265c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+b56aaec52bc0fa35591a872fb4aac81f606e265c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 80585e50dd44fedf65f45678c52143ad017c4287599451c6c1166611a9ad5c36
[INFO] running `Command { std: "docker" "start" "-a" "80585e50dd44fedf65f45678c52143ad017c4287599451c6c1166611a9ad5c36", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "80585e50dd44fedf65f45678c52143ad017c4287599451c6c1166611a9ad5c36", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "80585e50dd44fedf65f45678c52143ad017c4287599451c6c1166611a9ad5c36", kill_on_drop: false }`
[INFO] [stdout] 80585e50dd44fedf65f45678c52143ad017c4287599451c6c1166611a9ad5c36
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+b56aaec52bc0fa35591a872fb4aac81f606e265c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ca6bf29c7d6b10144b9bae9bb507b5a7d56d6ac533d3cf302c2ceab157f879a5
[INFO] running `Command { std: "docker" "start" "-a" "ca6bf29c7d6b10144b9bae9bb507b5a7d56d6ac533d3cf302c2ceab157f879a5", kill_on_drop: false }`
[INFO] [stderr]     Checking zephyr-common v0.1.0 (/opt/rustwide/workdir/zephyr-common)
[INFO] [stderr]     Checking katastrophes v0.1.0 (/opt/rustwide/workdir/katastrophes)
[INFO] [stdout] warning: unused import: `std::fmt::format`
[INFO] [stdout]  --> katastrophes/src/high_and_low.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::fmt::format;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt::format`
[INFO] [stdout]  --> katastrophes/src/high_and_low.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::fmt::format;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `high_and_low` is never used
[INFO] [stdout]  --> katastrophes/src/high_and_low.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn high_and_low(numbers: &str) -> String {
[INFO] [stdout]   |    ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking zephyr-cli v0.1.0 (/opt/rustwide/workdir/zephyr-cli)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.41s
[INFO] running `Command { std: "docker" "inspect" "ca6bf29c7d6b10144b9bae9bb507b5a7d56d6ac533d3cf302c2ceab157f879a5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ca6bf29c7d6b10144b9bae9bb507b5a7d56d6ac533d3cf302c2ceab157f879a5", kill_on_drop: false }`
[INFO] [stdout] ca6bf29c7d6b10144b9bae9bb507b5a7d56d6ac533d3cf302c2ceab157f879a5