[INFO] cloning repository https://github.com/MrWint/smb-opt
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/MrWint/smb-opt" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMrWint%2Fsmb-opt", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMrWint%2Fsmb-opt'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] daa44287bc9ccab7e85b430e80bf7dff77542542
[INFO] documenting MrWint/smb-opt 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%2FMrWint%2Fsmb-opt" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/MrWint/smb-opt 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/MrWint/smb-opt
[INFO] finished tweaking git repo https://github.com/MrWint/smb-opt
[INFO] tweaked toml for git repo https://github.com/MrWint/smb-opt written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/MrWint/smb-opt 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-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] 0d77c19d592cae3e401eec45af398c70b68e9cd97783cd84410d3a668be9dabf
[INFO] running `Command { std: "docker" "start" "-a" "0d77c19d592cae3e401eec45af398c70b68e9cd97783cd84410d3a668be9dabf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0d77c19d592cae3e401eec45af398c70b68e9cd97783cd84410d3a668be9dabf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0d77c19d592cae3e401eec45af398c70b68e9cd97783cd84410d3a668be9dabf", kill_on_drop: false }`
[INFO] [stdout] 0d77c19d592cae3e401eec45af398c70b68e9cd97783cd84410d3a668be9dabf
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] b96b3e187436fd1f6caa72ca8f6b885ae2bd16ce114cad79b52bc753068ef45e
[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" "b96b3e187436fd1f6caa72ca8f6b885ae2bd16ce114cad79b52bc753068ef45e", kill_on_drop: false }`
[INFO] [stderr]    Compiling typenum v1.9.0
[INFO] [stderr]     Checking libc v0.2.36
[INFO] [stderr]     Checking lazy_static v1.0.0
[INFO] [stderr]     Checking bitpack v0.2.1
[INFO] [stderr]     Checking bitflags v1.0.1
[INFO] [stderr]     Checking time v0.1.39
[INFO] [stderr]  Documenting smb-opt v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(associated_type_defaults)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(fixed_size_array)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 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 `smb-opt`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type bin --crate-name smb_opt 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 bitflags=/opt/rustwide/target/debug/deps/libbitflags-a89612c8cfb60e64.rmeta --extern bitpack=/opt/rustwide/target/debug/deps/libbitpack-68ed3abd5a6d41cb.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-cf6de5a7670865a1.rmeta --extern time=/opt/rustwide/target/debug/deps/libtime-d3d8ed979d5e378f.rmeta --extern typenum=/opt/rustwide/target/debug/deps/libtypenum-bb8f3a6f45a0d14c.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "b96b3e187436fd1f6caa72ca8f6b885ae2bd16ce114cad79b52bc753068ef45e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b96b3e187436fd1f6caa72ca8f6b885ae2bd16ce114cad79b52bc753068ef45e", kill_on_drop: false }`
[INFO] [stdout] b96b3e187436fd1f6caa72ca8f6b885ae2bd16ce114cad79b52bc753068ef45e