[INFO] fetching crate variyak 0.2.0...
[INFO] testing variyak-0.2.0 against 1.59.0 for beta-1.60-1
[INFO] extracting crate variyak 0.2.0 into /workspace/builds/worker-20/source
[INFO] validating manifest of crates.io crate variyak 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 variyak 0.2.0
[INFO] finished tweaking crates.io crate variyak 0.2.0
[INFO] tweaked toml for crates.io crate variyak 0.2.0 written to /workspace/builds/worker-20/source/Cargo.toml
[INFO] crate crates.io crate variyak 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-20/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/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] 86290281c1f427f30a168d7e20b8b13895e6170a868f2ecdcc03501f72a9c710
[INFO] running `Command { std: "docker" "start" "-a" "86290281c1f427f30a168d7e20b8b13895e6170a868f2ecdcc03501f72a9c710", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "86290281c1f427f30a168d7e20b8b13895e6170a868f2ecdcc03501f72a9c710", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "86290281c1f427f30a168d7e20b8b13895e6170a868f2ecdcc03501f72a9c710", kill_on_drop: false }`
[INFO] [stdout] 86290281c1f427f30a168d7e20b8b13895e6170a868f2ecdcc03501f72a9c710
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/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] 05c4c21083a105283ba96b66ffe6f1e125203b30d49693ccdd390ed8af98d8cf
[INFO] running `Command { std: "docker" "start" "-a" "05c4c21083a105283ba96b66ffe6f1e125203b30d49693ccdd390ed8af98d8cf", kill_on_drop: false }`
[INFO] [stderr]    Compiling seq-macro v0.2.1
[INFO] [stderr]    Compiling variyak v0.2.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.06s
[INFO] running `Command { std: "docker" "inspect" "05c4c21083a105283ba96b66ffe6f1e125203b30d49693ccdd390ed8af98d8cf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "05c4c21083a105283ba96b66ffe6f1e125203b30d49693ccdd390ed8af98d8cf", kill_on_drop: false }`
[INFO] [stdout] 05c4c21083a105283ba96b66ffe6f1e125203b30d49693ccdd390ed8af98d8cf
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/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" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bf33a27a70079c1da57b758d311df5bd9020bb443ddc268391570a47dce02900
[INFO] running `Command { std: "docker" "start" "-a" "bf33a27a70079c1da57b758d311df5bd9020bb443ddc268391570a47dce02900", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.88
[INFO] [stderr]    Compiling variyak v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> examples/libc_printf.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(c_variadic)]
[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] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> examples/c_variadic.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(c_variadic)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `variyak` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[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: build failed
[INFO] running `Command { std: "docker" "inspect" "bf33a27a70079c1da57b758d311df5bd9020bb443ddc268391570a47dce02900", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bf33a27a70079c1da57b758d311df5bd9020bb443ddc268391570a47dce02900", kill_on_drop: false }`
[INFO] [stdout] bf33a27a70079c1da57b758d311df5bd9020bb443ddc268391570a47dce02900