[INFO] cloning repository https://github.com/dcastelltort/rusty-chip8
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/dcastelltort/rusty-chip8" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdcastelltort%2Frusty-chip8", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdcastelltort%2Frusty-chip8'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ba9b44d5f7544aceb4f40a965d49f18413abef9d
[INFO] documenting dcastelltort/rusty-chip8 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdcastelltort%2Frusty-chip8" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/dcastelltort/rusty-chip8 on toolchain beta-2020-08-29
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/dcastelltort/rusty-chip8
[INFO] finished tweaking git repo https://github.com/dcastelltort/rusty-chip8
[INFO] tweaked toml for git repo https://github.com/dcastelltort/rusty-chip8 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/dcastelltort/rusty-chip8 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded structopt-derive v0.2.8
[INFO] [stderr]   Downloaded cc v1.0.17
[INFO] [stderr]   Downloaded syn v0.14.2
[INFO] [stderr]   Downloaded serde_derive v1.0.66
[INFO] [stderr]   Downloaded serde v1.0.66
[INFO] [stderr]   Downloaded structopt v0.2.8
[INFO] [stderr]   Downloaded quicli v0.2.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "+beta-2020-08-29" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3345f95629651b7a42ecaa8cdfd8153e9264d457ed817e247417409f3cd8fdcc
[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" "3345f95629651b7a42ecaa8cdfd8153e9264d457ed817e247417409f3cd8fdcc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3345f95629651b7a42ecaa8cdfd8153e9264d457ed817e247417409f3cd8fdcc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3345f95629651b7a42ecaa8cdfd8153e9264d457ed817e247417409f3cd8fdcc", kill_on_drop: false }`
[INFO] [stdout] 3345f95629651b7a42ecaa8cdfd8153e9264d457ed817e247417409f3cd8fdcc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "+beta-2020-08-29" "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] 20da2632fa652a388d8e9a712dbe9e4f9d9a1ae3f11e1b2b09a7c08c48726278
[INFO] running `Command { std: "docker" "start" "-a" "20da2632fa652a388d8e9a712dbe9e4f9d9a1ae3f11e1b2b09a7c08c48726278", kill_on_drop: false }`
[INFO] [stderr]    Compiling cc v1.0.17
[INFO] [stderr]     Checking textwrap v0.9.0
[INFO] [stderr]     Checking regex v1.0.0
[INFO] [stderr]     Checking serde_json v1.0.19
[INFO] [stderr]     Checking rayon v0.9.0
[INFO] [stderr]    Compiling structopt-derive v0.2.8
[INFO] [stderr]     Checking clap v2.31.2
[INFO] [stderr]    Compiling backtrace-sys v0.1.23
[INFO] [stderr]     Checking env_logger v0.5.10
[INFO] [stderr]     Checking structopt v0.2.8
[INFO] [stderr]     Checking backtrace v0.3.8
[INFO] [stderr]     Checking failure v0.1.1
[INFO] [stderr]     Checking quicli v0.2.0
[INFO] [stderr]  Documenting rusty-chip8 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(fs_read_write)] //TO REMOVE with ugraded nightly or stable
[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 `rusty-chip8`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type bin --crate-name rusty_chip8 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 failure=/opt/rustwide/target/debug/deps/libfailure-6eb0a03e858dc70c.rmeta --extern quicli=/opt/rustwide/target/debug/deps/libquicli-3fe3220902ca17d3.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-61ef6393f7bc8f53.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-bd7d3d1ee8532a5d.rmeta --cap-lints=warn --crate-version 0.1.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "20da2632fa652a388d8e9a712dbe9e4f9d9a1ae3f11e1b2b09a7c08c48726278", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "20da2632fa652a388d8e9a712dbe9e4f9d9a1ae3f11e1b2b09a7c08c48726278", kill_on_drop: false }`
[INFO] [stdout] 20da2632fa652a388d8e9a712dbe9e4f9d9a1ae3f11e1b2b09a7c08c48726278