[INFO] fetching crate lumiere 0.2.0...
[INFO] testing lumiere-0.2.0 against 1.59.0 for beta-1.60-1
[INFO] extracting crate lumiere 0.2.0 into /workspace/builds/worker-56/source
[INFO] validating manifest of crates.io crate lumiere 0.2.0 on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate lumiere 0.2.0
[INFO] finished tweaking crates.io crate lumiere 0.2.0
[INFO] tweaked toml for crates.io crate lumiere 0.2.0 written to /workspace/builds/worker-56/source/Cargo.toml
[INFO] crate crates.io crate lumiere 0.2.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-56/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-56/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1569532450b6248f969bfd2cc00a65d260481c0c74203bbe8ca2755e46eb8fe9
[INFO] running `Command { std: "docker" "start" "-a" "1569532450b6248f969bfd2cc00a65d260481c0c74203bbe8ca2755e46eb8fe9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1569532450b6248f969bfd2cc00a65d260481c0c74203bbe8ca2755e46eb8fe9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1569532450b6248f969bfd2cc00a65d260481c0c74203bbe8ca2755e46eb8fe9", kill_on_drop: false }`
[INFO] [stdout] 1569532450b6248f969bfd2cc00a65d260481c0c74203bbe8ca2755e46eb8fe9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-56/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-56/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" "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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4c26c41ca3c00838cad10aae674d457c71a2e2fb73b8d76d33a1a90c11b4beb7
[INFO] running `Command { std: "docker" "start" "-a" "4c26c41ca3c00838cad10aae674d457c71a2e2fb73b8d76d33a1a90c11b4beb7", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.107
[INFO] [stderr]    Compiling encoding_index_tests v0.1.4
[INFO] [stderr]    Compiling crc32fast v1.2.1
[INFO] [stderr]    Compiling ppv-lite86 v0.2.15
[INFO] [stderr]    Compiling adler v1.0.2
[INFO] [stderr]    Compiling adler32 v1.2.0
[INFO] [stderr]    Compiling number_prefix v0.4.0
[INFO] [stderr]    Compiling miniz_oxide v0.4.4
[INFO] [stderr]    Compiling encoding-index-singlebyte v1.20141219.5
[INFO] [stderr]    Compiling encoding-index-japanese v1.20141219.5
[INFO] [stderr]    Compiling encoding-index-tradchinese v1.20141219.5
[INFO] [stderr]    Compiling encoding-index-korean v1.20141219.5
[INFO] [stderr]    Compiling encoding-index-simpchinese v1.20141219.5
[INFO] [stderr]    Compiling deflate v0.9.1
[INFO] [stderr]    Compiling encoding v0.2.33
[INFO] [stderr]    Compiling png v0.17.2
[INFO] [stderr]    Compiling getrandom v0.2.3
[INFO] [stderr]    Compiling terminal_size v0.1.17
[INFO] [stderr]    Compiling console v0.15.0
[INFO] [stderr]    Compiling rand_core v0.6.3
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling indicatif v0.16.2
[INFO] [stderr]    Compiling rand v0.8.4
[INFO] [stderr]    Compiling lumiere 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:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(generic_const_exprs)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 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 `lumiere` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "4c26c41ca3c00838cad10aae674d457c71a2e2fb73b8d76d33a1a90c11b4beb7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4c26c41ca3c00838cad10aae674d457c71a2e2fb73b8d76d33a1a90c11b4beb7", kill_on_drop: false }`
[INFO] [stdout] 4c26c41ca3c00838cad10aae674d457c71a2e2fb73b8d76d33a1a90c11b4beb7