[INFO] fetching crate detour 0.8.1...
[INFO] documenting detour-0.8.1 against 1.54.0 for beta-1.55-rustdoc-1
[INFO] extracting crate detour 0.8.1 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate detour 0.8.1 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate detour 0.8.1
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate detour 0.8.1
[INFO] tweaked toml for crates.io crate detour 0.8.1 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate crates.io crate detour 0.8.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--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-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a17bbe6cc773549dd0c796eda22979414f800b4dd95e5586ee5ea37af21674c3
[INFO] running `Command { std: "docker" "start" "-a" "a17bbe6cc773549dd0c796eda22979414f800b4dd95e5586ee5ea37af21674c3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a17bbe6cc773549dd0c796eda22979414f800b4dd95e5586ee5ea37af21674c3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a17bbe6cc773549dd0c796eda22979414f800b4dd95e5586ee5ea37af21674c3", kill_on_drop: false }`
[INFO] [stdout] a17bbe6cc773549dd0c796eda22979414f800b4dd95e5586ee5ea37af21674c3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7c4e361cff85030639bca5687c5cc5fbcf10761b479fd6433b708d15cbd89c37
[INFO] running `Command { std: "docker" "start" "-a" "7c4e361cff85030639bca5687c5cc5fbcf10761b479fd6433b708d15cbd89c37", 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]     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 v2.2.0
[INFO] [stderr]  Documenting detour v0.8.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:4:3
[INFO] [stdout]   |
[INFO] [stdout] 4 |   feature(const_fn_trait_bound, 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-810dd9fbe1e28608.rmeta --extern generic_array=/opt/rustwide/target/debug/deps/libgeneric_array-0f2ff2e379a5743d.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-acd7d23482fe8b54.rmeta --extern libc=/opt/rustwide/target/debug/deps/liblibc-89eec0e6253e96f3.rmeta --extern udis=/opt/rustwide/target/debug/deps/liblibudis86_sys-db2dadfd353d65d7.rmeta --extern mmap=/opt/rustwide/target/debug/deps/libmmap_fixed-eebf71a23f4ff089.rmeta --extern region=/opt/rustwide/target/debug/deps/libregion-cdda664f25dcb4bb.rmeta --extern slice_pool=/opt/rustwide/target/debug/deps/libslice_pool-e34708eba30fec48.rmeta --cap-lints=warn --crate-version 0.8.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "7c4e361cff85030639bca5687c5cc5fbcf10761b479fd6433b708d15cbd89c37", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7c4e361cff85030639bca5687c5cc5fbcf10761b479fd6433b708d15cbd89c37", kill_on_drop: false }`
[INFO] [stdout] 7c4e361cff85030639bca5687c5cc5fbcf10761b479fd6433b708d15cbd89c37
