[INFO] cloning repository https://github.com/kyutech-programming-club/rust_quiz_2021
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kyutech-programming-club/rust_quiz_2021" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkyutech-programming-club%2Frust_quiz_2021", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkyutech-programming-club%2Frust_quiz_2021'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c6cf52fe39c15caa059c153f24faefc7d51a6fa3
[INFO] documenting kyutech-programming-club/rust_quiz_2021 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkyutech-programming-club%2Frust_quiz_2021" "/workspace/builds/worker-28/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-28/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kyutech-programming-club/rust_quiz_2021 on toolchain 1.61.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-28/source/rust-toolchain.toml
[INFO] started tweaking git repo https://github.com/kyutech-programming-club/rust_quiz_2021
[INFO] finished tweaking git repo https://github.com/kyutech-programming-club/rust_quiz_2021
[INFO] tweaked toml for git repo https://github.com/kyutech-programming-club/rust_quiz_2021 written to /workspace/builds/worker-28/source/Cargo.toml
[INFO] crate git repo https://github.com/kyutech-programming-club/rust_quiz_2021 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded num-bigint v0.4.2
[INFO] [stderr]   Downloaded pretty_assertions v0.7.2
[INFO] [stderr]   Downloaded rstest v0.11.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-28/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-28/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 26f80594d256779321630bd428e3b0f943819d332f738e943f24773e023c36a4
[INFO] running `Command { std: "docker" "start" "-a" "26f80594d256779321630bd428e3b0f943819d332f738e943f24773e023c36a4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "26f80594d256779321630bd428e3b0f943819d332f738e943f24773e023c36a4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "26f80594d256779321630bd428e3b0f943819d332f738e943f24773e023c36a4", kill_on_drop: false }`
[INFO] [stdout] 26f80594d256779321630bd428e3b0f943819d332f738e943f24773e023c36a4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-28/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-28/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 81bb639b46d293d3da619fb8ba59100180c968022f50fd6885a3b04c9103e522
[INFO] running `Command { std: "docker" "start" "-a" "81bb639b46d293d3da619fb8ba59100180c968022f50fd6885a3b04c9103e522", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v1.0.28
[INFO] [stderr]    Compiling syn v1.0.74
[INFO] [stderr]    Compiling semver v1.0.4
[INFO] [stderr]    Compiling libc v0.2.101
[INFO] [stderr]     Checking bytemuck v1.7.2
[INFO] [stderr]    Compiling typenum v1.14.0
[INFO] [stderr]     Checking rawpointer v0.2.1
[INFO] [stderr]    Compiling anyhow v1.0.43
[INFO] [stderr]    Compiling paste v1.0.5
[INFO] [stderr]     Checking difference v2.0.0
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling num-bigint v0.4.2
[INFO] [stderr]    Compiling num-rational v0.4.0
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]     Checking itertools v0.10.1
[INFO] [stderr]     Checking pretty_assertions v0.7.2
[INFO] [stderr]     Checking matrixmultiply v0.3.1
[INFO] [stderr]     Checking safe_arch v0.6.0
[INFO] [stderr]     Checking wide v0.7.0
[INFO] [stderr]    Compiling rustc_version v0.4.0
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]    Compiling rstest v0.11.0
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking num-complex v0.4.0
[INFO] [stderr]     Checking approx v0.5.0
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.4
[INFO] [stderr]     Checking simba v0.6.0
[INFO] [stderr]     Checking num v0.4.0
[INFO] [stderr]    Compiling nalgebra-macros v0.1.0
[INFO] [stderr]    Compiling thiserror-impl v1.0.26
[INFO] [stderr]     Checking nalgebra v0.29.0
[INFO] [stderr]     Checking thiserror v1.0.26
[INFO] [stderr]  Documenting rust_quiz_2021 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(generic_associated_types)]
[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:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(fn_traits)]
[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:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(associated_type_defaults)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 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 `rust_quiz_2021`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name rust_quiz_2021 src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=0859eed74d3710b8 -L dependency=/opt/rustwide/target/debug/deps --extern anyhow=/opt/rustwide/target/debug/deps/libanyhow-d285cee26cfc4d53.rmeta --extern approx=/opt/rustwide/target/debug/deps/libapprox-209e145ffdb79f9f.rmeta --extern difference=/opt/rustwide/target/debug/deps/libdifference-070daaccf3d6c027.rmeta --extern itertools=/opt/rustwide/target/debug/deps/libitertools-768244cffa2ddad5.rmeta --extern matches=/opt/rustwide/target/debug/deps/libmatches-f1c4024f57379e6f.rmeta --extern nalgebra=/opt/rustwide/target/debug/deps/libnalgebra-01054e515f9eedb3.rmeta --extern num=/opt/rustwide/target/debug/deps/libnum-5ffacaf198ef438b.rmeta --extern pretty_assertions=/opt/rustwide/target/debug/deps/libpretty_assertions-4ee0582b9b9e0bfe.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-7bb8698f15f1fbec.rmeta --extern rstest=/opt/rustwide/target/debug/deps/librstest-d113b0dfa63db492.so --extern thiserror=/opt/rustwide/target/debug/deps/libthiserror-5ad363dd9dde2e52.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "81bb639b46d293d3da619fb8ba59100180c968022f50fd6885a3b04c9103e522", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "81bb639b46d293d3da619fb8ba59100180c968022f50fd6885a3b04c9103e522", kill_on_drop: false }`
[INFO] [stdout] 81bb639b46d293d3da619fb8ba59100180c968022f50fd6885a3b04c9103e522