[INFO] fetching crate fn_der 0.1.3...
[INFO] testing fn_der-0.1.3 against try#dec9417b8611e34e787a3e4c37686b5131f9e5c5 for pr-154210-1
[INFO] extracting crate fn_der 0.1.3 into /workspace/builds/worker-5-tc2/source
[INFO] started tweaking crates.io crate fn_der 0.1.3
[INFO] finished tweaking crates.io crate fn_der 0.1.3
[INFO] tweaked toml for crates.io crate fn_der 0.1.3 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate fn_der 0.1.3 on toolchain dec9417b8611e34e787a3e4c37686b5131f9e5c5
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 1 package to latest compatible version
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6ac364d8486e680a546c17e0e8aaaf4668c442906ef66ed9320ac4a63ebf3444
[INFO] running `Command { std: "docker" "start" "-a" "6ac364d8486e680a546c17e0e8aaaf4668c442906ef66ed9320ac4a63ebf3444", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6ac364d8486e680a546c17e0e8aaaf4668c442906ef66ed9320ac4a63ebf3444", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6ac364d8486e680a546c17e0e8aaaf4668c442906ef66ed9320ac4a63ebf3444", kill_on_drop: false }`
[INFO] [stdout] 6ac364d8486e680a546c17e0e8aaaf4668c442906ef66ed9320ac4a63ebf3444
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ab5fa1b68f2c5642b38a9db0f7ea58e96b6343fabfbed775df09e6fdd4dcdcc6
[INFO] running `Command { std: "docker" "start" "-a" "ab5fa1b68f2c5642b38a9db0f7ea58e96b6343fabfbed775df09e6fdd4dcdcc6", kill_on_drop: false }`
[INFO] [stderr]    Compiling fn_grad v0.1.3
[INFO] [stdout] error: cannot find attribute `const_trait` in this scope
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/fn_grad-0.1.3/src/lib.rs:28:3
[INFO] [stdout]    |
[INFO] [stdout] 28 | #[const_trait]
[INFO] [stdout]    |   ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: cannot find attribute `const_trait` in this scope
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/fn_grad-0.1.3/src/lib.rs:20:3
[INFO] [stdout]    |
[INFO] [stdout] 20 | #[const_trait]
[INFO] [stdout]    |   ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: cannot find attribute `const_trait` in this scope
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/fn_grad-0.1.3/src/lib.rs:10:3
[INFO] [stdout]    |
[INFO] [stdout] 10 | #[const_trait]
[INFO] [stdout]    |   ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `fn_grad` (lib) due to 3 previous errors
[INFO] running `Command { std: "docker" "inspect" "ab5fa1b68f2c5642b38a9db0f7ea58e96b6343fabfbed775df09e6fdd4dcdcc6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ab5fa1b68f2c5642b38a9db0f7ea58e96b6343fabfbed775df09e6fdd4dcdcc6", kill_on_drop: false }`
[INFO] [stdout] ab5fa1b68f2c5642b38a9db0f7ea58e96b6343fabfbed775df09e6fdd4dcdcc6