[INFO] fetching crate clsag 0.3.0...
[INFO] documenting clsag-0.3.0 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate clsag 0.3.0 into /workspace/builds/worker-14/source
[INFO] validating manifest of crates.io crate clsag 0.3.0 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 crates.io crate clsag 0.3.0
[INFO] finished tweaking crates.io crate clsag 0.3.0
[INFO] tweaked toml for crates.io crate clsag 0.3.0 written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[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 merlin v1.3.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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] c4b17a2a432c0a374ceb786e94072b0e61e8aead18d54f563f1abeba24ce9a44
[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" "c4b17a2a432c0a374ceb786e94072b0e61e8aead18d54f563f1abeba24ce9a44", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c4b17a2a432c0a374ceb786e94072b0e61e8aead18d54f563f1abeba24ce9a44", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c4b17a2a432c0a374ceb786e94072b0e61e8aead18d54f563f1abeba24ce9a44", kill_on_drop: false }`
[INFO] [stdout] c4b17a2a432c0a374ceb786e94072b0e61e8aead18d54f563f1abeba24ce9a44
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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] 9881fca9b6471d9b416b7f6cceb7e5864a71cdf6208d18c69c5a5f48d2cab4fd
[INFO] running `Command { std: "docker" "start" "-a" "9881fca9b6471d9b416b7f6cceb7e5864a71cdf6208d18c69c5a5f48d2cab4fd", kill_on_drop: false }`
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling subtle v2.2.3
[INFO] [stderr]    Compiling clear_on_drop v0.2.4
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]    Compiling typenum v1.12.0
[INFO] [stderr]    Compiling serde v1.0.115
[INFO] [stderr]    Compiling zeroize_derive v1.0.0
[INFO] [stderr]     Checking rand_chacha v0.1.1
[INFO] [stderr]     Checking rand_isaac v0.1.1
[INFO] [stderr]     Checking rand_xorshift v0.1.1
[INFO] [stderr]     Checking rand_hc v0.1.0
[INFO] [stderr]     Checking rand v0.6.5
[INFO] [stderr]     Checking block-buffer v0.7.3
[INFO] [stderr]    Compiling generic-array v0.12.3
[INFO] [stderr]     Checking sha2 v0.8.2
[INFO] [stderr]    Compiling digest v0.8.1
[INFO] [stderr]     Checking zeroize v1.1.0
[INFO] [stderr]     Checking merlin v1.3.0
[INFO] [stderr]    Compiling curve25519-dalek v1.2.4
[INFO] [stderr]  Documenting clsag v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(test)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: Could not document `clsag`.
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] Caused by:
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name clsag 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 curve25519_dalek=/opt/rustwide/target/debug/deps/libcurve25519_dalek-71c65224790ec720.rmeta --extern merlin=/opt/rustwide/target/debug/deps/libmerlin-1f4e39191dcc9e98.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-bcc8921325be3307.rmeta --extern sha2=/opt/rustwide/target/debug/deps/libsha2-90d37f76f8733704.rmeta --cap-lints=warn --crate-version 0.3.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "9881fca9b6471d9b416b7f6cceb7e5864a71cdf6208d18c69c5a5f48d2cab4fd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9881fca9b6471d9b416b7f6cceb7e5864a71cdf6208d18c69c5a5f48d2cab4fd", kill_on_drop: false }`
[INFO] [stdout] 9881fca9b6471d9b416b7f6cceb7e5864a71cdf6208d18c69c5a5f48d2cab4fd