[INFO] cloning repository https://github.com/Renmusxd/PyIsingMonteCarlo
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Renmusxd/PyIsingMonteCarlo" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FRenmusxd%2FPyIsingMonteCarlo", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FRenmusxd%2FPyIsingMonteCarlo'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b8df3949de15e84c0c8274720da3783954bc44ca
[INFO] documenting Renmusxd/PyIsingMonteCarlo against 1.54.0 for beta-1.55-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FRenmusxd%2FPyIsingMonteCarlo" "/workspace/builds/worker-101/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-101/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Renmusxd/PyIsingMonteCarlo on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-101/source/.cargo/config
[INFO] removed /workspace/builds/worker-101/source/rust-toolchain
[INFO] started tweaking git repo https://github.com/Renmusxd/PyIsingMonteCarlo
[INFO] finished tweaking git repo https://github.com/Renmusxd/PyIsingMonteCarlo
[INFO] tweaked toml for git repo https://github.com/Renmusxd/PyIsingMonteCarlo written to /workspace/builds/worker-101/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-101/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-101/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 759128c72d1513c671a5dc59bdd83a11b3d8ceec8ada50c5ec09531c6d717cb3
[INFO] running `Command { std: "docker" "start" "-a" "759128c72d1513c671a5dc59bdd83a11b3d8ceec8ada50c5ec09531c6d717cb3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "759128c72d1513c671a5dc59bdd83a11b3d8ceec8ada50c5ec09531c6d717cb3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "759128c72d1513c671a5dc59bdd83a11b3d8ceec8ada50c5ec09531c6d717cb3", kill_on_drop: false }`
[INFO] [stdout] 759128c72d1513c671a5dc59bdd83a11b3d8ceec8ada50c5ec09531c6d717cb3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-101/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-101/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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 70fa4c2b0428329871f198a5d1a820e16b506348257c6a0f1c637c2f4a9fec60
[INFO] running `Command { std: "docker" "start" "-a" "70fa4c2b0428329871f198a5d1a820e16b506348257c6a0f1c637c2f4a9fec60", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling proc-macro2 v1.0.28
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.74
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling libc v0.2.98
[INFO] [stderr]    Compiling serde_derive v1.0.127
[INFO] [stderr]    Compiling serde v1.0.127
[INFO] [stderr]    Compiling crossbeam-utils v0.8.5
[INFO] [stderr]    Compiling proc-macro-hack v0.5.19
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.5
[INFO] [stderr]    Compiling pyo3-build-config v0.14.2
[INFO] [stderr]    Compiling rayon-core v1.9.1
[INFO] [stderr]    Compiling once_cell v1.8.0
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]    Compiling unindent v0.1.7
[INFO] [stderr]     Checking ppv-lite86 v0.2.10
[INFO] [stderr]     Checking strength_reduce v0.2.3
[INFO] [stderr]     Checking half v1.7.1
[INFO] [stderr]     Checking lock_api v0.4.4
[INFO] [stderr]     Checking matrixmultiply v0.3.1
[INFO] [stderr]     Checking instant v0.1.10
[INFO] [stderr]     Checking itertools v0.10.1
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling memoffset v0.6.4
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling rayon v1.5.1
[INFO] [stderr]     Checking crossbeam-channel v0.5.1
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]    Compiling paste-impl v0.1.18
[INFO] [stderr]     Checking crossbeam-deque v0.8.1
[INFO] [stderr]     Checking paste v0.1.18
[INFO] [stderr]    Compiling pyo3 v0.14.2
[INFO] [stderr]     Checking num-complex v0.4.0
[INFO] [stderr]     Checking transpose v0.2.1
[INFO] [stderr]     Checking primal-check v0.3.1
[INFO] [stderr]     Checking rustfft v6.0.1
[INFO] [stderr]    Compiling pyo3-macros-backend v0.14.2
[INFO] [stderr]     Checking ndarray v0.15.3
[INFO] [stderr]    Compiling indoc-impl v0.3.6
[INFO] [stderr]    Compiling pyo3-macros v0.14.2
[INFO] [stderr]     Checking indoc v0.3.6
[INFO] [stderr]     Checking smallvec v1.6.1
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking serde_cbor 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/smallvec-1.6.1/src/lib.rs:75:41
[INFO] [stdout]    |
[INFO] [stdout] 75 | #![cfg_attr(feature = "specialization", 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 `smallvec`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "70fa4c2b0428329871f198a5d1a820e16b506348257c6a0f1c637c2f4a9fec60", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "70fa4c2b0428329871f198a5d1a820e16b506348257c6a0f1c637c2f4a9fec60", kill_on_drop: false }`
[INFO] [stdout] 70fa4c2b0428329871f198a5d1a820e16b506348257c6a0f1c637c2f4a9fec60
