[INFO] cloning repository https://github.com/Edward-0/rust-riscv-playground
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Edward-0/rust-riscv-playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEdward-0%2Frust-riscv-playground", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEdward-0%2Frust-riscv-playground'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ae4c274f85a4eb2b7337773b967c2a88f6497efb
[INFO] documenting Edward-0/rust-riscv-playground 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%2FEdward-0%2Frust-riscv-playground" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Edward-0/rust-riscv-playground 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] removed /workspace/builds/worker-6/source/.cargo/config
[INFO] started tweaking git repo https://github.com/Edward-0/rust-riscv-playground
[INFO] finished tweaking git repo https://github.com/Edward-0/rust-riscv-playground
[INFO] tweaked toml for git repo https://github.com/Edward-0/rust-riscv-playground written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/Edward-0/rust-riscv-playground 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 embedded-hal v0.2.4
[INFO] [stderr]   Downloaded bare-metal v0.2.4
[INFO] [stderr]   Downloaded riscv v0.5.6
[INFO] [stderr]   Downloaded e310x-hal v0.8.3
[INFO] [stderr]   Downloaded riscv-rt-macros v0.1.6
[INFO] [stderr]   Downloaded riscv-rt v0.6.1
[INFO] [stderr]   Downloaded hifive1 v0.8.1
[INFO] [stderr]   Downloaded e310x v0.6.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] b7c4856d3e8ba39ed57de7220b46abe3c4744d3fd121b5394d9e7332c5dc5e73
[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" "b7c4856d3e8ba39ed57de7220b46abe3c4744d3fd121b5394d9e7332c5dc5e73", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b7c4856d3e8ba39ed57de7220b46abe3c4744d3fd121b5394d9e7332c5dc5e73", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b7c4856d3e8ba39ed57de7220b46abe3c4744d3fd121b5394d9e7332c5dc5e73", kill_on_drop: false }`
[INFO] [stdout] b7c4856d3e8ba39ed57de7220b46abe3c4744d3fd121b5394d9e7332c5dc5e73
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] [stdout] db135b80dedce08244359ac51f6449d6e41987b78f9aa0b7a56ac5824721faa1
[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" "db135b80dedce08244359ac51f6449d6e41987b78f9aa0b7a56ac5824721faa1", kill_on_drop: false }`
[INFO] [stderr]    Compiling riscv v0.5.6
[INFO] [stderr]    Compiling riscv-rt v0.6.1
[INFO] [stderr]    Compiling e310x v0.6.0
[INFO] [stderr]    Compiling hifive1 v0.8.1
[INFO] [stderr]     Checking panic-halt v0.2.0
[INFO] [stderr]     Checking embedded-hal v0.2.4
[INFO] [stderr]    Compiling riscv-rt-macros v0.1.6
[INFO] [stderr]    Compiling bare-metal v0.2.4
[INFO] [stderr]     Checking e310x-hal v0.8.3
[INFO] [stderr]  Documenting rust-riscv-playground 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:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(alloc_error_handler)]
[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 `rust-riscv-playground`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name rust_riscv_playground 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 e310x_hal=/opt/rustwide/target/debug/deps/libe310x_hal-8b5a3bb4f77cefcf.rmeta --extern embedded_hal=/opt/rustwide/target/debug/deps/libembedded_hal-ff25ed2afa839b8d.rmeta --extern hifive1=/opt/rustwide/target/debug/deps/libhifive1-810f7e1e7ba97159.rmeta --extern panic_halt=/opt/rustwide/target/debug/deps/libpanic_halt-e898de5af9d9d9bd.rmeta --extern riscv=/opt/rustwide/target/debug/deps/libriscv-5d96e2f4afb152d1.rmeta --extern riscv_rt=/opt/rustwide/target/debug/deps/libriscv_rt-5ca9d352b5a4421c.rmeta --cap-lints=warn --crate-version 0.1.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "db135b80dedce08244359ac51f6449d6e41987b78f9aa0b7a56ac5824721faa1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "db135b80dedce08244359ac51f6449d6e41987b78f9aa0b7a56ac5824721faa1", kill_on_drop: false }`
[INFO] [stdout] db135b80dedce08244359ac51f6449d6e41987b78f9aa0b7a56ac5824721faa1