[INFO] fetching crate jkcenum_derive 0.2.0...
[INFO] testing jkcenum_derive-0.2.0 against 1.76.0 for beta-1.77-1
[INFO] extracting crate jkcenum_derive 0.2.0 into /workspace/builds/worker-5-tc1/source
[INFO] validating manifest of crates.io crate jkcenum_derive 0.2.0 on toolchain 1.76.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.76.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate jkcenum_derive 0.2.0
[INFO] finished tweaking crates.io crate jkcenum_derive 0.2.0
[INFO] tweaked toml for crates.io crate jkcenum_derive 0.2.0 written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.76.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.76.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded virtue v0.0.16
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.76.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ea58e3db24552abf8ed272a826d9fcddc79ee66786caf5fc64e93966aa6a2249
[INFO] running `Command { std: "docker" "start" "-a" "ea58e3db24552abf8ed272a826d9fcddc79ee66786caf5fc64e93966aa6a2249", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ea58e3db24552abf8ed272a826d9fcddc79ee66786caf5fc64e93966aa6a2249", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ea58e3db24552abf8ed272a826d9fcddc79ee66786caf5fc64e93966aa6a2249", kill_on_drop: false }`
[INFO] [stdout] ea58e3db24552abf8ed272a826d9fcddc79ee66786caf5fc64e93966aa6a2249
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.76.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2c18f4ced708eb1b4f420b6f33917395d5e4f585f0a412c71d85a6962543e80a
[INFO] running `Command { std: "docker" "start" "-a" "2c18f4ced708eb1b4f420b6f33917395d5e4f585f0a412c71d85a6962543e80a", kill_on_drop: false }`
[INFO] [stderr]    Compiling virtue v0.0.16
[INFO] [stderr]    Compiling jkcenum_derive v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(let_chains)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `jkcenum_derive` (lib) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "2c18f4ced708eb1b4f420b6f33917395d5e4f585f0a412c71d85a6962543e80a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2c18f4ced708eb1b4f420b6f33917395d5e4f585f0a412c71d85a6962543e80a", kill_on_drop: false }`
[INFO] [stdout] 2c18f4ced708eb1b4f420b6f33917395d5e4f585f0a412c71d85a6962543e80a
