[INFO] fetching crate doh-dns 0.2.0...
[INFO] documenting doh-dns-0.2.0 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate doh-dns 0.2.0 into /workspace/builds/worker-10/source
[INFO] validating manifest of crates.io crate doh-dns 0.2.0 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 doh-dns 0.2.0
[INFO] finished tweaking crates.io crate doh-dns 0.2.0
[INFO] tweaked toml for crates.io crate doh-dns 0.2.0 written to /workspace/builds/worker-10/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]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 32e74f72eea468d32b62c5ed0129a4db4139b290a98ead162e030e7f88993045
[INFO] running `Command { std: "docker" "start" "-a" "32e74f72eea468d32b62c5ed0129a4db4139b290a98ead162e030e7f88993045", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "32e74f72eea468d32b62c5ed0129a4db4139b290a98ead162e030e7f88993045", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "32e74f72eea468d32b62c5ed0129a4db4139b290a98ead162e030e7f88993045", kill_on_drop: false }`
[INFO] [stdout] 32e74f72eea468d32b62c5ed0129a4db4139b290a98ead162e030e7f88993045
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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] 92e6d41b44025eeb37ef3eeb18749ec5a4bfddc507c8ee6fbce894f5d2b9ebf9
[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" "92e6d41b44025eeb37ef3eeb18749ec5a4bfddc507c8ee6fbce894f5d2b9ebf9", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling tokio-macros v0.2.5
[INFO] [stderr]    Compiling async-trait v0.1.40
[INFO] [stderr]    Compiling num-derive v0.3.2
[INFO] [stderr]     Checking futures-util v0.3.5
[INFO] [stderr]     Checking tokio v0.2.22
[INFO] [stderr]     Checking tokio-util v0.3.1
[INFO] [stderr]     Checking tokio-tls v0.3.1
[INFO] [stderr]     Checking h2 v0.2.6
[INFO] [stderr]     Checking hyper v0.13.7
[INFO] [stderr]     Checking hyper-tls v0.4.3
[INFO] [stderr]  Documenting doh-dns v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:59:1
[INFO] [stdout]    |
[INFO] [stdout] 59 | #![feature(proc_macro_hygiene)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:60:1
[INFO] [stdout]    |
[INFO] [stdout] 60 | #![feature(stmt_expr_attributes)]
[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 `doh-dns`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name doh_dns 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 async_trait=/opt/rustwide/target/debug/deps/libasync_trait-0ab722a20751d8c3.so --extern futures_util=/opt/rustwide/target/debug/deps/libfutures_util-a723723c8cadf440.rmeta --extern hyper=/opt/rustwide/target/debug/deps/libhyper-62ea15acb7d26f98.rmeta --extern hyper_tls=/opt/rustwide/target/debug/deps/libhyper_tls-ccb53427a63c0145.rmeta --extern idna=/opt/rustwide/target/debug/deps/libidna-131fb8475231839c.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-8b25aaf2e71705fc.rmeta --extern native_tls=/opt/rustwide/target/debug/deps/libnative_tls-7a9dc31afafccdc2.rmeta --extern num=/opt/rustwide/target/debug/deps/libnum-5c8133c7b1dd4db6.rmeta --extern num_derive=/opt/rustwide/target/debug/deps/libnum_derive-44043fc0b147a904.so --extern num_traits=/opt/rustwide/target/debug/deps/libnum_traits-b5dbcc2daa2e7df6.rmeta --extern paste=/opt/rustwide/target/debug/deps/libpaste-2f704f6a61524c63.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-ec5e695d7e4b5284.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-a01b1b5912b72e09.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-7b195ede6b83e119.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-4a3b20282726244b.rmeta --extern tower_service=/opt/rustwide/target/debug/deps/libtower_service-f0af52d3eeda61e7.rmeta --cap-lints=warn --crate-version 0.2.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "92e6d41b44025eeb37ef3eeb18749ec5a4bfddc507c8ee6fbce894f5d2b9ebf9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "92e6d41b44025eeb37ef3eeb18749ec5a4bfddc507c8ee6fbce894f5d2b9ebf9", kill_on_drop: false }`
[INFO] [stdout] 92e6d41b44025eeb37ef3eeb18749ec5a4bfddc507c8ee6fbce894f5d2b9ebf9