[INFO] cloning repository https://github.com/duvholt/rust-metaheuristic-framework
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/duvholt/rust-metaheuristic-framework" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fduvholt%2Frust-metaheuristic-framework", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fduvholt%2Frust-metaheuristic-framework'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 11c125e2a2840aed9b61b2f40b7bc406ec9970f2
[INFO] documenting duvholt/rust-metaheuristic-framework 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%2Fduvholt%2Frust-metaheuristic-framework" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/duvholt/rust-metaheuristic-framework 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/duvholt/rust-metaheuristic-framework
[INFO] finished tweaking git repo https://github.com/duvholt/rust-metaheuristic-framework
[INFO] tweaked toml for git repo https://github.com/duvholt/rust-metaheuristic-framework written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/duvholt/rust-metaheuristic-framework 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-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 774d43594129432885dd559900f2598ebae092e669fd2a04a1782aa18667d58a
[INFO] running `Command { std: "docker" "start" "-a" "774d43594129432885dd559900f2598ebae092e669fd2a04a1782aa18667d58a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "774d43594129432885dd559900f2598ebae092e669fd2a04a1782aa18667d58a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "774d43594129432885dd559900f2598ebae092e669fd2a04a1782aa18667d58a", kill_on_drop: false }`
[INFO] [stdout] 774d43594129432885dd559900f2598ebae092e669fd2a04a1782aa18667d58a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] ed97424cef2dc9eb1d0150b79ac03713ac5c7f98f2debd46a88e06db519199f9
[INFO] running `Command { std: "docker" "start" "-a" "ed97424cef2dc9eb1d0150b79ac03713ac5c7f98f2debd46a88e06db519199f9", kill_on_drop: false }`
[INFO] [stderr]     Checking num-traits v0.2.2
[INFO] [stderr]     Checking serde v1.0.38
[INFO] [stderr]     Checking assert_approx_eq v1.0.0
[INFO] [stderr]     Checking rand v0.4.2
[INFO] [stderr]     Checking atty v0.2.8
[INFO] [stderr]    Compiling quote v0.5.1
[INFO] [stderr]     Checking unreachable v0.1.1
[INFO] [stderr]     Checking clap v2.31.2
[INFO] [stderr]    Compiling syn v0.13.1
[INFO] [stderr]     Checking rand v0.3.22
[INFO] [stderr]     Checking num-integer v0.1.36
[INFO] [stderr]     Checking num-complex v0.1.43
[INFO] [stderr]     Checking num-traits v0.1.43
[INFO] [stderr]     Checking ordered-float v0.5.0
[INFO] [stderr]     Checking num-bigint v0.1.43
[INFO] [stderr]     Checking num-iter v0.1.35
[INFO] [stderr]    Compiling serde_derive_internals v0.23.1
[INFO] [stderr]     Checking num-rational v0.1.42
[INFO] [stderr]     Checking num v0.1.42
[INFO] [stderr]     Checking statistical v0.1.1
[INFO] [stderr]    Compiling serde_derive v1.0.38
[INFO] [stderr]     Checking serde_json v1.0.14
[INFO] [stderr]  Documenting rustoa v0.0.1 (/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(test)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 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 `rustoa`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name rustoa 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 ansi_term=/opt/rustwide/target/debug/deps/libansi_term-3dd567f9ac19187d.rmeta --extern assert_approx_eq=/opt/rustwide/target/debug/deps/libassert_approx_eq-1a00f4b123ec827a.rmeta --extern clap=/opt/rustwide/target/debug/deps/libclap-060c5b80986d8dd5.rmeta --extern itertools=/opt/rustwide/target/debug/deps/libitertools-a4e01d700bacbbb2.rmeta --extern ordered_float=/opt/rustwide/target/debug/deps/libordered_float-810b495124681d4f.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-01097136fce75e79.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-a4739e6c3fcbde9c.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-df89078f42c88816.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-77944ce81ffd2f31.rmeta --extern statistical=/opt/rustwide/target/debug/deps/libstatistical-a8dade73ea09d798.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "ed97424cef2dc9eb1d0150b79ac03713ac5c7f98f2debd46a88e06db519199f9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ed97424cef2dc9eb1d0150b79ac03713ac5c7f98f2debd46a88e06db519199f9", kill_on_drop: false }`
[INFO] [stdout] ed97424cef2dc9eb1d0150b79ac03713ac5c7f98f2debd46a88e06db519199f9