[INFO] fetching crate tls-async 0.3.0-alpha.7...
[INFO] documenting tls-async-0.3.0-alpha.7 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate tls-async 0.3.0-alpha.7 into /workspace/builds/worker-28/source
[INFO] validating manifest of crates.io crate tls-async 0.3.0-alpha.7 on toolchain 1.61.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate tls-async 0.3.0-alpha.7
[INFO] finished tweaking crates.io crate tls-async 0.3.0-alpha.7
[INFO] tweaked toml for crates.io crate tls-async 0.3.0-alpha.7 written to /workspace/builds/worker-28/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "fetch" "--manifest-path" "Cargo.toml", 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-28/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-28/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 279140affbcd9037ad4eeb1f0fe9ee5c1236834a687549529aeac3afb4fe70d0
[INFO] running `Command { std: "docker" "start" "-a" "279140affbcd9037ad4eeb1f0fe9ee5c1236834a687549529aeac3afb4fe70d0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "279140affbcd9037ad4eeb1f0fe9ee5c1236834a687549529aeac3afb4fe70d0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "279140affbcd9037ad4eeb1f0fe9ee5c1236834a687549529aeac3afb4fe70d0", kill_on_drop: false }`
[INFO] [stdout] 279140affbcd9037ad4eeb1f0fe9ee5c1236834a687549529aeac3afb4fe70d0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-28/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-28/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d4012014bb4fb1baa635099f95acb1afe2347707a864f9b08edc4356d2edf455
[INFO] running `Command { std: "docker" "start" "-a" "d4012014bb4fb1baa635099f95acb1afe2347707a864f9b08edc4356d2edf455", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]    Compiling cc v1.0.73
[INFO] [stderr]    Compiling proc-macro2 v1.0.39
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling unicode-ident v1.0.0
[INFO] [stderr]    Compiling syn v1.0.95
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling pkg-config v0.3.25
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]     Checking futures-sink-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking futures-core-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking futures v0.1.31
[INFO] [stderr]     Checking foreign-types-shared v0.1.1
[INFO] [stderr]     Checking pin-utils v0.1.0
[INFO] [stderr]     Checking slab v0.4.6
[INFO] [stderr]     Checking adler v1.0.2
[INFO] [stderr]     Checking futures-io-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking gimli v0.26.1
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]    Compiling unicode-xid v0.2.3
[INFO] [stderr]    Compiling openssl v0.10.40
[INFO] [stderr]     Checking bitflags v1.3.2
[INFO] [stderr]     Checking rustc-demangle v0.1.21
[INFO] [stderr]     Checking once_cell v1.12.0
[INFO] [stderr]    Compiling native-tls v0.2.10
[INFO] [stderr]     Checking openssl-probe v0.1.5
[INFO] [stderr]     Checking memchr v2.5.0
[INFO] [stderr]     Checking futures-channel-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking miniz_oxide v0.5.1
[INFO] [stderr]     Checking foreign-types v0.3.2
[INFO] [stderr]     Checking log v0.4.17
[INFO] [stderr]     Checking object v0.28.4
[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]     Checking num_cpus v1.13.1
[INFO] [stderr]    Compiling openssl-sys v0.9.73
[INFO] [stderr]    Compiling backtrace v0.3.65
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]    Compiling quote v1.0.18
[INFO] [stderr]     Checking tokio-io v0.1.13
[INFO] [stderr]     Checking futures-util-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking addr2line v0.17.0
[INFO] [stderr]     Checking futures-executor-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking futures-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling synstructure v0.12.6
[INFO] [stderr]    Compiling openssl-macros v0.1.0
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]  Documenting tls-async v0.3.0-alpha.7 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:17:1
[INFO] [stdout]    |
[INFO] [stdout] 17 | #![feature(async_await)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]    |
[INFO] [stdout]    = help: the feature `async_await` has been stable since 1.39.0 and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not document `tls-async`
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name tls_async src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=9b63af75ac3d4e5f -L dependency=/opt/rustwide/target/debug/deps --extern failure=/opt/rustwide/target/debug/deps/libfailure-7fa68b375ddbd216.rmeta --extern failure_derive=/opt/rustwide/target/debug/deps/libfailure_derive-467a887e0adf32dd.so --extern futures=/opt/rustwide/target/debug/deps/libfutures-bd067e26b88167ea.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-4c2b941844e2fcbb.rmeta --extern native_tls=/opt/rustwide/target/debug/deps/libnative_tls-5a4700e5d2f7067f.rmeta --cap-lints=warn --crate-version 0.3.0-alpha.7` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "d4012014bb4fb1baa635099f95acb1afe2347707a864f9b08edc4356d2edf455", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d4012014bb4fb1baa635099f95acb1afe2347707a864f9b08edc4356d2edf455", kill_on_drop: false }`
[INFO] [stdout] d4012014bb4fb1baa635099f95acb1afe2347707a864f9b08edc4356d2edf455