[INFO] cloning repository https://github.com/IndigoLily/mandelbrot.rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/IndigoLily/mandelbrot.rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FIndigoLily%2Fmandelbrot.rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FIndigoLily%2Fmandelbrot.rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ff7431e3518174ef10b7254618070e2faa213a81
[INFO] documenting IndigoLily/mandelbrot.rs against 1.46.0 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FIndigoLily%2Fmandelbrot.rs" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/IndigoLily/mandelbrot.rs on toolchain 1.46.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/IndigoLily/mandelbrot.rs
[INFO] finished tweaking git repo https://github.com/IndigoLily/mandelbrot.rs
[INFO] tweaked toml for git repo https://github.com/IndigoLily/mandelbrot.rs written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/IndigoLily/mandelbrot.rs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6644f3a062fdd1bd17ac3780f4a5701a7a4f5b9e23714e0a4dc2f58a53e9be86
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "6644f3a062fdd1bd17ac3780f4a5701a7a4f5b9e23714e0a4dc2f58a53e9be86", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6644f3a062fdd1bd17ac3780f4a5701a7a4f5b9e23714e0a4dc2f58a53e9be86", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6644f3a062fdd1bd17ac3780f4a5701a7a4f5b9e23714e0a4dc2f58a53e9be86", kill_on_drop: false }`
[INFO] [stdout] 6644f3a062fdd1bd17ac3780f4a5701a7a4f5b9e23714e0a4dc2f58a53e9be86
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3363f5386ca41b286e7c853d474951aadb12fc46ae49a6cb9eb449c1bfff75c5
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "3363f5386ca41b286e7c853d474951aadb12fc46ae49a6cb9eb449c1bfff75c5", kill_on_drop: false }`
[INFO] [stderr]     Checking adler32 v1.2.0
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling num-iter v0.1.41
[INFO] [stderr]     Checking threadpool v1.8.1
[INFO] [stderr]     Checking miniz_oxide v0.3.7
[INFO] [stderr]     Checking deflate v0.8.6
[INFO] [stderr]     Checking png v0.16.7
[INFO] [stderr]     Checking num-integer v0.1.43
[INFO] [stderr]     Checking num-complex v0.3.0
[INFO] [stderr]     Checking num-bigint v0.3.0
[INFO] [stderr]     Checking num-rational v0.3.0
[INFO] [stderr]     Checking num v0.3.0
[INFO] [stderr]  Documenting mandelbrot v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0658]: use of unstable library feature 'tau_constant'
[INFO] [stdout]   --> src/main.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | use std::f64::consts::TAU;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #66770 <https://github.com/rust-lang/rust/issues/66770> for more information
[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 E0658`.
[INFO] [stdout] 
[INFO] [stderr] error: Could not document `mandelbrot`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name mandelbrot src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern num=/opt/rustwide/target/debug/deps/libnum-6431a13a2a6a9336.rmeta --extern png=/opt/rustwide/target/debug/deps/libpng-5b8d2beca9a28a10.rmeta --extern threadpool=/opt/rustwide/target/debug/deps/libthreadpool-36d2b72aec0b1fac.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "3363f5386ca41b286e7c853d474951aadb12fc46ae49a6cb9eb449c1bfff75c5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3363f5386ca41b286e7c853d474951aadb12fc46ae49a6cb9eb449c1bfff75c5", kill_on_drop: false }`
[INFO] [stdout] 3363f5386ca41b286e7c853d474951aadb12fc46ae49a6cb9eb449c1bfff75c5