[INFO] fetching crate michelangelo 0.2.5...
[INFO] testing michelangelo-0.2.5 against 1.60.0 for beta-1.61-1
[INFO] extracting crate michelangelo 0.2.5 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate michelangelo 0.2.5 on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate michelangelo 0.2.5
[INFO] finished tweaking crates.io crate michelangelo 0.2.5
[INFO] tweaked toml for crates.io crate michelangelo 0.2.5 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded nalgebra v0.20.0
[INFO] [stderr]   Downloaded primal-estimate v0.2.1
[INFO] [stderr]   Downloaded primal-check v0.2.3
[INFO] [stderr]   Downloaded hamming v0.1.3
[INFO] [stderr]   Downloaded primal-bit v0.2.4
[INFO] [stderr]   Downloaded compact_macros v0.1.0
[INFO] [stderr]   Downloaded simple_allocator_trait v0.1.0
[INFO] [stderr]   Downloaded stable-vec v0.3.2
[INFO] [stderr]   Downloaded descartes v0.1.20
[INFO] [stderr]   Downloaded primal-sieve v0.2.9
[INFO] [stderr]   Downloaded compact v0.2.16
[INFO] [stderr]   Downloaded primal v0.2.3
[INFO] [stderr]   Downloaded sid v0.5.2
[INFO] [stderr]   Downloaded lyon_tessellation v0.11.0
[INFO] [stderr]   Downloaded ordered-float v0.5.2
[INFO] [stderr]   Downloaded lyon_geom v0.11.1
[INFO] [stderr]   Downloaded lyon_path v0.11.0
[INFO] [stderr]   Downloaded euclid v0.18.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c6909101e85297ff8c4801d9017b27333d5736e9c1d2b21bf39d6407cdcefe7c
[INFO] running `Command { std: "docker" "start" "-a" "c6909101e85297ff8c4801d9017b27333d5736e9c1d2b21bf39d6407cdcefe7c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c6909101e85297ff8c4801d9017b27333d5736e9c1d2b21bf39d6407cdcefe7c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c6909101e85297ff8c4801d9017b27333d5736e9c1d2b21bf39d6407cdcefe7c", kill_on_drop: false }`
[INFO] [stdout] c6909101e85297ff8c4801d9017b27333d5736e9c1d2b21bf39d6407cdcefe7c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9ca9c4414c088bfb820e1de1543f68f7a44aa6ddd25a0cf85021f1eed8a9e915
[INFO] running `Command { std: "docker" "start" "-a" "9ca9c4414c088bfb820e1de1543f68f7a44aa6ddd25a0cf85021f1eed8a9e915", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libm v0.2.2
[INFO] [stderr]    Compiling arrayvec v0.4.12
[INFO] [stderr]    Compiling hamming v0.1.3
[INFO] [stderr]    Compiling rawpointer v0.2.1
[INFO] [stderr]    Compiling primal-estimate v0.2.1
[INFO] [stderr]    Compiling unicode-xid v0.0.4
[INFO] [stderr]    Compiling bit-vec v0.5.1
[INFO] [stderr]    Compiling quote v0.3.15
[INFO] [stderr]    Compiling simple_allocator_trait v0.1.0
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-complex v0.2.4
[INFO] [stderr]    Compiling num-rational v0.2.4
[INFO] [stderr]    Compiling unreachable v1.0.0
[INFO] [stderr]    Compiling itertools v0.7.11
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling matrixmultiply v0.2.4
[INFO] [stderr]    Compiling primal-bit v0.2.4
[INFO] [stderr]    Compiling synom v0.11.3
[INFO] [stderr]    Compiling stable-vec v0.3.2
[INFO] [stderr]    Compiling primal-sieve v0.2.9
[INFO] [stderr]    Compiling syn v0.11.11
[INFO] [stderr]    Compiling rand_distr v0.2.2
[INFO] [stderr]    Compiling compact_macros v0.1.0
[INFO] [stderr]    Compiling num-traits v0.1.43
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling approx v0.3.2
[INFO] [stderr]    Compiling euclid v0.18.2
[INFO] [stderr]    Compiling ordered-float v0.5.2
[INFO] [stderr]    Compiling sid v0.5.2
[INFO] [stderr]    Compiling primal-check v0.2.3
[INFO] [stderr]    Compiling alga v0.9.3
[INFO] [stderr]    Compiling primal v0.2.3
[INFO] [stderr]    Compiling compact v0.2.16
[INFO] [stderr]    Compiling lyon_geom v0.11.1
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/compact-0.2.16/src/lib.rs:17:1
[INFO] [stdout]    |
[INFO] [stdout] 17 | #![feature(specialization)]
[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 `compact` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "9ca9c4414c088bfb820e1de1543f68f7a44aa6ddd25a0cf85021f1eed8a9e915", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9ca9c4414c088bfb820e1de1543f68f7a44aa6ddd25a0cf85021f1eed8a9e915", kill_on_drop: false }`
[INFO] [stdout] 9ca9c4414c088bfb820e1de1543f68f7a44aa6ddd25a0cf85021f1eed8a9e915