[INFO] cloning repository https://github.com/learn-you-a-rust/return_values
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/learn-you-a-rust/return_values" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flearn-you-a-rust%2Freturn_values", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flearn-you-a-rust%2Freturn_values'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 909d38d1f4f6cefcc5ba7ce7d8b1454ea4bcabe1
[INFO] checking learn-you-a-rust/return_values against master#5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f for pr-87248
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flearn-you-a-rust%2Freturn_values" "/workspace/builds/worker-11/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-11/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/learn-you-a-rust/return_values on toolchain 5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/learn-you-a-rust/return_values
[INFO] finished tweaking git repo https://github.com/learn-you-a-rust/return_values
[INFO] tweaked toml for git repo https://github.com/learn-you-a-rust/return_values written to /workspace/builds/worker-11/source/Cargo.toml
[INFO] crate git repo https://github.com/learn-you-a-rust/return_values already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] af84204b3e274ba913246da3f7ab0f6ef42eff009373dcfdb9eaf7ee65362c4d
[INFO] running `Command { std: "docker" "start" "-a" "af84204b3e274ba913246da3f7ab0f6ef42eff009373dcfdb9eaf7ee65362c4d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "af84204b3e274ba913246da3f7ab0f6ef42eff009373dcfdb9eaf7ee65362c4d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "af84204b3e274ba913246da3f7ab0f6ef42eff009373dcfdb9eaf7ee65362c4d", kill_on_drop: false }`
[INFO] [stdout] af84204b3e274ba913246da3f7ab0f6ef42eff009373dcfdb9eaf7ee65362c4d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6ff9e8347dd7d003c2b01f7b339e4e5803d60ee8d8576fd81d182a06b415086b
[INFO] running `Command { std: "docker" "start" "-a" "6ff9e8347dd7d003c2b01f7b339e4e5803d60ee8d8576fd81d182a06b415086b", kill_on_drop: false }`
[INFO] [stderr]     Checking return_values v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.08s
[INFO] running `Command { std: "docker" "inspect" "6ff9e8347dd7d003c2b01f7b339e4e5803d60ee8d8576fd81d182a06b415086b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6ff9e8347dd7d003c2b01f7b339e4e5803d60ee8d8576fd81d182a06b415086b", kill_on_drop: false }`
[INFO] [stdout] 6ff9e8347dd7d003c2b01f7b339e4e5803d60ee8d8576fd81d182a06b415086b