[INFO] cloning repository https://github.com/aconbere/rust-channel-stack-overflow
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/aconbere/rust-channel-stack-overflow" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Faconbere%2Frust-channel-stack-overflow", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Faconbere%2Frust-channel-stack-overflow'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] cbdeb5dc3e385d541572ec0aaea0cd755d45368e
[INFO] checking aconbere/rust-channel-stack-overflow against master#fe348cd1a8e0fa445b772393147ed865904dcd4d for pr-139587-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Faconbere%2Frust-channel-stack-overflow" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/aconbere/rust-channel-stack-overflow on toolchain fe348cd1a8e0fa445b772393147ed865904dcd4d
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+fe348cd1a8e0fa445b772393147ed865904dcd4d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/aconbere/rust-channel-stack-overflow
[INFO] finished tweaking git repo https://github.com/aconbere/rust-channel-stack-overflow
[INFO] tweaked toml for git repo https://github.com/aconbere/rust-channel-stack-overflow written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/aconbere/rust-channel-stack-overflow 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" "+fe348cd1a8e0fa445b772393147ed865904dcd4d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+fe348cd1a8e0fa445b772393147ed865904dcd4d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0de438aeaf6c8a8395f6668cc7cca51fdf914f390e89c815710ab11509bd157b
[INFO] running `Command { std: "docker" "start" "-a" "0de438aeaf6c8a8395f6668cc7cca51fdf914f390e89c815710ab11509bd157b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0de438aeaf6c8a8395f6668cc7cca51fdf914f390e89c815710ab11509bd157b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0de438aeaf6c8a8395f6668cc7cca51fdf914f390e89c815710ab11509bd157b", kill_on_drop: false }`
[INFO] [stdout] 0de438aeaf6c8a8395f6668cc7cca51fdf914f390e89c815710ab11509bd157b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+fe348cd1a8e0fa445b772393147ed865904dcd4d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 776f86dd16d6df7e5042829255dc4c7e75fc8fcda728f0d96f514124fc54dad3
[INFO] running `Command { std: "docker" "start" "-a" "776f86dd16d6df7e5042829255dc4c7e75fc8fcda728f0d96f514124fc54dad3", kill_on_drop: false }`
[INFO] [stderr]     Checking stack-overflow v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variant `B` is never constructed
[INFO] [stdout]   --> src/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 5  | enum T {
[INFO] [stdout]    |      - variant in this enum
[INFO] [stdout] ...
[INFO] [stdout] 10 |     B
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `T` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `B` is never constructed
[INFO] [stdout]   --> src/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 5  | enum T {
[INFO] [stdout]    |      - variant in this enum
[INFO] [stdout] ...
[INFO] [stdout] 10 |     B
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `T` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.07s
[INFO] running `Command { std: "docker" "inspect" "776f86dd16d6df7e5042829255dc4c7e75fc8fcda728f0d96f514124fc54dad3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "776f86dd16d6df7e5042829255dc4c7e75fc8fcda728f0d96f514124fc54dad3", kill_on_drop: false }`
[INFO] [stdout] 776f86dd16d6df7e5042829255dc4c7e75fc8fcda728f0d96f514124fc54dad3