[INFO] cloning repository https://github.com/myelin-ai/engine
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/myelin-ai/engine" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmyelin-ai%2Fengine", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmyelin-ai%2Fengine'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0457e868357cef6916418e9674807b6988414444
[INFO] documenting myelin-ai/engine 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%2Fmyelin-ai%2Fengine" "/workspace/builds/worker-103/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-103/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/myelin-ai/engine 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-103/source/rust-toolchain
[INFO] started tweaking git repo https://github.com/myelin-ai/engine
[INFO] finished tweaking git repo https://github.com/myelin-ai/engine
[INFO] tweaked toml for git repo https://github.com/myelin-ai/engine written to /workspace/builds/worker-103/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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded nameof v1.2.1
[INFO] [stderr]   Downloaded mockiato v0.9.5
[INFO] [stderr]   Downloaded myelin-geometry v2.4.2
[INFO] [stderr]   Downloaded nphysics2d v0.12.3
[INFO] [stderr]   Downloaded nearly_eq v0.2.4
[INFO] [stderr]   Downloaded slotmap v0.3.1
[INFO] [stderr]   Downloaded ncollide2d v0.20.1
[INFO] [stderr]   Downloaded mockiato-codegen v0.9.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-103/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-103/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] faf0374aba8013db2ebde1c11e24eb7b7d6b1d0bffdbb88cace4893bb97d1d49
[INFO] running `Command { std: "docker" "start" "-a" "faf0374aba8013db2ebde1c11e24eb7b7d6b1d0bffdbb88cace4893bb97d1d49", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "faf0374aba8013db2ebde1c11e24eb7b7d6b1d0bffdbb88cace4893bb97d1d49", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "faf0374aba8013db2ebde1c11e24eb7b7d6b1d0bffdbb88cace4893bb97d1d49", kill_on_drop: false }`
[INFO] [stdout] faf0374aba8013db2ebde1c11e24eb7b7d6b1d0bffdbb88cace4893bb97d1d49
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-103/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-103/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] 9470b894f025af5cb28db6a6ec46856a23235bf0fc20c8e5fdf3ba5e4ba537d8
[INFO] running `Command { std: "docker" "start" "-a" "9470b894f025af5cb28db6a6ec46856a23235bf0fc20c8e5fdf3ba5e4ba537d8", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libm v0.2.1
[INFO] [stderr]    Compiling libc v0.2.98
[INFO] [stderr]    Compiling proc-macro2 v1.0.28
[INFO] [stderr]    Compiling syn v1.0.74
[INFO] [stderr]    Compiling serde_derive v1.0.127
[INFO] [stderr]     Checking rawpointer v0.2.1
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]    Compiling serde v1.0.127
[INFO] [stderr]     Checking fixedbitset v0.1.9
[INFO] [stderr]     Checking ordermap v0.3.5
[INFO] [stderr]     Checking slab v0.4.4
[INFO] [stderr]     Checking slotmap v0.3.1
[INFO] [stderr]     Checking downcast-rs v1.2.0
[INFO] [stderr]     Checking nameof v1.2.1
[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 rand v0.6.5
[INFO] [stderr]    Compiling typenum v1.13.0
[INFO] [stderr]     Checking generational-arena v0.2.8
[INFO] [stderr]     Checking smallvec v0.6.14
[INFO] [stderr]     Checking matrixmultiply v0.2.4
[INFO] [stderr]     Checking itertools v0.10.1
[INFO] [stderr]     Checking petgraph v0.4.13
[INFO] [stderr]     Checking generic-array v0.12.4
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking time v0.1.44
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]     Checking num-integer v0.1.44
[INFO] [stderr]     Checking approx v0.3.2
[INFO] [stderr]     Checking alga v0.9.3
[INFO] [stderr]     Checking nalgebra v0.18.1
[INFO] [stderr]     Checking ncollide2d v0.20.1
[INFO] [stderr]     Checking myelin-geometry v2.4.2
[INFO] [stderr]     Checking nphysics2d v0.12.3
[INFO] [stderr]  Documenting myelin-engine v0.14.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![feature(specialization)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![feature(non_exhaustive)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `non_exhaustive` has been stable since 1.40.0 and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:7:1
[INFO] [stdout]   |
[INFO] [stdout] 7 | #![feature(box_syntax)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:8:1
[INFO] [stdout]   |
[INFO] [stdout] 8 | #![feature(trait_alias)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 5 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `myelin-engine`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name myelin_engine src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern alga=/opt/rustwide/target/debug/deps/libalga-c1c4b90b54e7110e.rmeta --extern myelin_geometry=/opt/rustwide/target/debug/deps/libmyelin_geometry-8704154b5d4f2763.rmeta --extern nalgebra=/opt/rustwide/target/debug/deps/libnalgebra-3f5c3b025d140903.rmeta --extern nameof=/opt/rustwide/target/debug/deps/libnameof-0416931a9fc97ae6.rmeta --extern ncollide2d=/opt/rustwide/target/debug/deps/libncollide2d-0329cad7dc552ca8.rmeta --extern nphysics2d=/opt/rustwide/target/debug/deps/libnphysics2d-63f2b305cf0009b6.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-9e0fd31f755d67fa.rmeta --extern slab=/opt/rustwide/target/debug/deps/libslab-95d9fc37d094a7dd.rmeta --cap-lints=warn --crate-version 0.14.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "9470b894f025af5cb28db6a6ec46856a23235bf0fc20c8e5fdf3ba5e4ba537d8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9470b894f025af5cb28db6a6ec46856a23235bf0fc20c8e5fdf3ba5e4ba537d8", kill_on_drop: false }`
[INFO] [stdout] 9470b894f025af5cb28db6a6ec46856a23235bf0fc20c8e5fdf3ba5e4ba537d8
