[INFO] fetching crate detour 0.7.1...
[INFO] documenting detour-0.7.1 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate detour 0.7.1 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate detour 0.7.1 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 detour 0.7.1
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate detour 0.7.1
[INFO] tweaked toml for crates.io crate detour 0.7.1 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate crates.io crate detour 0.7.1 already has a lockfile, it will not be regenerated
[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 mmap-fixed v0.1.5
[INFO] [stderr]   Downloaded slice-pool v0.4.1
[INFO] [stderr]   Downloaded libudis86-sys v0.2.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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] a41e7e6c378ae118dad1fba1fbfc7e544e445657c10d8df572f99d7c648cf9ea
[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" "a41e7e6c378ae118dad1fba1fbfc7e544e445657c10d8df572f99d7c648cf9ea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a41e7e6c378ae118dad1fba1fbfc7e544e445657c10d8df572f99d7c648cf9ea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a41e7e6c378ae118dad1fba1fbfc7e544e445657c10d8df572f99d7c648cf9ea", kill_on_drop: false }`
[INFO] [stdout] a41e7e6c378ae118dad1fba1fbfc7e544e445657c10d8df572f99d7c648cf9ea
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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] e216753958252df70e38f7d5f17573ac8de9f84473c6dbd085d83f9ae47cd2ea
[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" "e216753958252df70e38f7d5f17573ac8de9f84473c6dbd085d83f9ae47cd2ea", 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 libc v0.2.62
[INFO] [stderr]    Compiling cc v1.0.40
[INFO] [stderr]    Compiling typenum v1.10.0
[INFO] [stderr]     Checking slice-pool v0.4.1
[INFO] [stderr]    Compiling libudis86-sys v0.2.1
[INFO] [stderr]     Checking mmap-fixed v0.1.5
[INFO] [stderr]     Checking region v2.1.2
[INFO] [stderr]     Checking generic-array v0.13.2
[INFO] [stderr]  Documenting detour v0.7.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:2:34
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![cfg_attr(feature = "nightly", feature(const_fn, unboxed_closures, abi_thiscall))]
[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 `detour`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name detour src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --cfg 'feature="nightly"' --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern cfg_if=/opt/rustwide/target/debug/deps/libcfg_if-2fa2280d11a4bc85.rmeta --extern generic_array=/opt/rustwide/target/debug/deps/libgeneric_array-4492211c47f62664.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-f7dbd11a2149f3ea.rmeta --extern libc=/opt/rustwide/target/debug/deps/liblibc-b9271fae7bcc04c0.rmeta --extern udis=/opt/rustwide/target/debug/deps/liblibudis86_sys-b83df924f96c809a.rmeta --extern mmap=/opt/rustwide/target/debug/deps/libmmap_fixed-77b3645583629c18.rmeta --extern region=/opt/rustwide/target/debug/deps/libregion-97b6c35166299076.rmeta --extern slice_pool=/opt/rustwide/target/debug/deps/libslice_pool-f01b85113b93eedb.rmeta --cap-lints=warn --crate-version 0.7.1` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "e216753958252df70e38f7d5f17573ac8de9f84473c6dbd085d83f9ae47cd2ea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e216753958252df70e38f7d5f17573ac8de9f84473c6dbd085d83f9ae47cd2ea", kill_on_drop: false }`
[INFO] [stdout] e216753958252df70e38f7d5f17573ac8de9f84473c6dbd085d83f9ae47cd2ea