[INFO] fetching crate fractran_rs 0.6.1...
[INFO] checking fractran_rs-0.6.1 against try#998b6603a58e47f42ccce7a67943234e96b6839e for pr-143170
[INFO] extracting crate fractran_rs 0.6.1 into /workspace/builds/worker-7-tc2/source
[INFO] started tweaking crates.io crate fractran_rs 0.6.1
[INFO] finished tweaking crates.io crate fractran_rs 0.6.1
[INFO] tweaked toml for crates.io crate fractran_rs 0.6.1 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate fractran_rs 0.6.1 on toolchain 998b6603a58e47f42ccce7a67943234e96b6839e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate fractran_rs 0.6.1 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" "+998b6603a58e47f42ccce7a67943234e96b6839e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 844ca4a7be21179a51553c876700fc5afe62d2d5a7f506b6f7ddbffab77daf5c
[INFO] running `Command { std: "docker" "start" "-a" "844ca4a7be21179a51553c876700fc5afe62d2d5a7f506b6f7ddbffab77daf5c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "844ca4a7be21179a51553c876700fc5afe62d2d5a7f506b6f7ddbffab77daf5c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "844ca4a7be21179a51553c876700fc5afe62d2d5a7f506b6f7ddbffab77daf5c", kill_on_drop: false }`
[INFO] [stdout] 844ca4a7be21179a51553c876700fc5afe62d2d5a7f506b6f7ddbffab77daf5c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c81927ea81b674f13b298799745bde02c50f86e0ab84209db1c398a55b3b36cb
[INFO] running `Command { std: "docker" "start" "-a" "c81927ea81b674f13b298799745bde02c50f86e0ab84209db1c398a55b3b36cb", kill_on_drop: false }`
[INFO] [stderr]     Checking fractran_rs v0.6.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> examples/add.rs:12:18
[INFO] [stdout]    |
[INFO] [stdout] 12 | struct AddOutput(u32);
[INFO] [stdout]    |        --------- ^^^
[INFO] [stdout]    |        |
[INFO] [stdout]    |        field in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider removing this field
[INFO] [stdout]    = note: `AddOutput` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> examples/multiply.rs:12:23
[INFO] [stdout]    |
[INFO] [stdout] 12 | struct MultiplyOutput(u32);
[INFO] [stdout]    |        -------------- ^^^
[INFO] [stdout]    |        |
[INFO] [stdout]    |        field in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider removing this field
[INFO] [stdout]    = note: `MultiplyOutput` has a derived impl for the trait `Debug`, but this is 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 0.52s
[INFO] running `Command { std: "docker" "inspect" "c81927ea81b674f13b298799745bde02c50f86e0ab84209db1c398a55b3b36cb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c81927ea81b674f13b298799745bde02c50f86e0ab84209db1c398a55b3b36cb", kill_on_drop: false }`
[INFO] [stdout] c81927ea81b674f13b298799745bde02c50f86e0ab84209db1c398a55b3b36cb