[INFO] cloning repository https://github.com/neilgall/lets-build-a-rusty-interpreter
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/neilgall/lets-build-a-rusty-interpreter" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fneilgall%2Flets-build-a-rusty-interpreter", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fneilgall%2Flets-build-a-rusty-interpreter'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9680f7114724d16f61320b05fb851f947fa0f5bd
[INFO] checking neilgall/lets-build-a-rusty-interpreter against try#4a04890980766cc79878135f5ade8c0c4321e943 for pr-65819
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fneilgall%2Flets-build-a-rusty-interpreter" "/workspace/builds/worker-10/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-10/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/neilgall/lets-build-a-rusty-interpreter on toolchain 4a04890980766cc79878135f5ade8c0c4321e943
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4a04890980766cc79878135f5ade8c0c4321e943" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/neilgall/lets-build-a-rusty-interpreter
[INFO] finished tweaking git repo https://github.com/neilgall/lets-build-a-rusty-interpreter
[INFO] tweaked toml for git repo https://github.com/neilgall/lets-build-a-rusty-interpreter written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] crate git repo https://github.com/neilgall/lets-build-a-rusty-interpreter already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4a04890980766cc79878135f5ade8c0c4321e943" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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:c46a2d1a26fb48b37929c74ca49dd9409f2375a0a3bdb8fe07617f3ffccaa889" "/opt/rustwide/cargo-home/bin/cargo" "+4a04890980766cc79878135f5ade8c0c4321e943" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] cb42b5e1a55608ff46969e5c2cbcc596d7c9f05e2cb548b81aab8ed03725dc5c
[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" "cb42b5e1a55608ff46969e5c2cbcc596d7c9f05e2cb548b81aab8ed03725dc5c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cb42b5e1a55608ff46969e5c2cbcc596d7c9f05e2cb548b81aab8ed03725dc5c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cb42b5e1a55608ff46969e5c2cbcc596d7c9f05e2cb548b81aab8ed03725dc5c", kill_on_drop: false }`
[INFO] [stdout] cb42b5e1a55608ff46969e5c2cbcc596d7c9f05e2cb548b81aab8ed03725dc5c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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:c46a2d1a26fb48b37929c74ca49dd9409f2375a0a3bdb8fe07617f3ffccaa889" "/opt/rustwide/cargo-home/bin/cargo" "+4a04890980766cc79878135f5ade8c0c4321e943" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 19c39052439c48d5354b8f6c0803597482a67f5a63cdd22638949579271853e7
[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" "19c39052439c48d5354b8f6c0803597482a67f5a63cdd22638949579271853e7", kill_on_drop: false }`
[INFO] [stderr]     Checking calculator v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variant is never constructed: `Integer`
[INFO] [stdout]  --> src/number.rs:4:2
[INFO] [stdout]   |
[INFO] [stdout] 4 |     Integer { value: i32 },
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Real`
[INFO] [stdout]  --> src/number.rs:5:2
[INFO] [stdout]   |
[INFO] [stdout] 5 |     Real { value: String }
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Integer`
[INFO] [stdout]  --> src/number.rs:4:2
[INFO] [stdout]   |
[INFO] [stdout] 4 |     Integer { value: i32 },
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Real`
[INFO] [stdout]  --> src/number.rs:5:2
[INFO] [stdout]   |
[INFO] [stdout] 5 |     Real { value: String }
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.03s
[INFO] running `Command { std: "docker" "inspect" "19c39052439c48d5354b8f6c0803597482a67f5a63cdd22638949579271853e7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "19c39052439c48d5354b8f6c0803597482a67f5a63cdd22638949579271853e7", kill_on_drop: false }`
[INFO] [stdout] 19c39052439c48d5354b8f6c0803597482a67f5a63cdd22638949579271853e7