[INFO] cloning repository https://github.com/vorner/duprm
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/vorner/duprm" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvorner%2Fduprm", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvorner%2Fduprm'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f5c96511c2964b7cb4127f8ae50b1bf3f3926373
[INFO] documenting vorner/duprm 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%2Fvorner%2Fduprm" "/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/vorner/duprm 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/vorner/duprm
[INFO] finished tweaking git repo https://github.com/vorner/duprm
[INFO] tweaked toml for git repo https://github.com/vorner/duprm written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/vorner/duprm 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] [stdout] 161596c5342f3461e23dd501305ce76d7d7fcde653a938811c14a30a164ebb49
[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" "161596c5342f3461e23dd501305ce76d7d7fcde653a938811c14a30a164ebb49", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "161596c5342f3461e23dd501305ce76d7d7fcde653a938811c14a30a164ebb49", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "161596c5342f3461e23dd501305ce76d7d7fcde653a938811c14a30a164ebb49", kill_on_drop: false }`
[INFO] [stdout] 161596c5342f3461e23dd501305ce76d7d7fcde653a938811c14a30a164ebb49
[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] d9dd21d9b4ce61461efa60f255168e8e656d0ca34da66c9ec0d8387763e8084d
[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" "d9dd21d9b4ce61461efa60f255168e8e656d0ca34da66c9ec0d8387763e8084d", kill_on_drop: false }`
[INFO] [stderr]     Checking either v1.1.0
[INFO] [stderr]     Checking num_cpus v1.4.0
[INFO] [stderr]     Checking futures-cpupool v0.1.5
[INFO] [stderr]  Documenting duprm 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(drop_types_in_const)]
[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 `duprm`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type bin --crate-name duprm 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 either=/opt/rustwide/target/debug/deps/libeither-d3c76015b9e5079b.rmeta --extern env_logger=/opt/rustwide/target/debug/deps/libenv_logger-6502056c285e64a2.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-071111f337bbf345.rmeta --extern futures_cpupool=/opt/rustwide/target/debug/deps/libfutures_cpupool-9fedf1160ae31811.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-ccac0abcf4846f1a.rmeta --extern num_cpus=/opt/rustwide/target/debug/deps/libnum_cpus-fcf38874483bcbda.rmeta --extern typed_arena=/opt/rustwide/target/debug/deps/libtyped_arena-fe391b5602299428.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "d9dd21d9b4ce61461efa60f255168e8e656d0ca34da66c9ec0d8387763e8084d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d9dd21d9b4ce61461efa60f255168e8e656d0ca34da66c9ec0d8387763e8084d", kill_on_drop: false }`
[INFO] [stdout] d9dd21d9b4ce61461efa60f255168e8e656d0ca34da66c9ec0d8387763e8084d