[INFO] crate rustc-ap-rustc_attr 666.0.0 is already in cache
[INFO] documenting rustc-ap-rustc_attr-666.0.0 against master#394e1b40d264aa6928811919c1124fa248e7d802 for pr-73566
[INFO] extracting crate rustc-ap-rustc_attr 666.0.0 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate rustc-ap-rustc_attr 666.0.0 on toolchain 394e1b40d264aa6928811919c1124fa248e7d802
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+394e1b40d264aa6928811919c1124fa248e7d802" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate rustc-ap-rustc_attr 666.0.0
[INFO] finished tweaking crates.io crate rustc-ap-rustc_attr 666.0.0
[INFO] tweaked toml for crates.io crate rustc-ap-rustc_attr 666.0.0 written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+394e1b40d264aa6928811919c1124fa248e7d802" "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" "+394e1b40d264aa6928811919c1124fa248e7d802" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:819119df93c0f5eca3f29186f14981ef29945a311854d7222af07488600a2584" "/opt/rustwide/cargo-home/bin/cargo" "+394e1b40d264aa6928811919c1124fa248e7d802" "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] 9844521e5f895b298b3adb76a6e5b13afc41692e1f30bd229d581fae866ec101
[INFO] running `Command { std: "docker" "start" "-a" "9844521e5f895b298b3adb76a6e5b13afc41692e1f30bd229d581fae866ec101", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9844521e5f895b298b3adb76a6e5b13afc41692e1f30bd229d581fae866ec101", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9844521e5f895b298b3adb76a6e5b13afc41692e1f30bd229d581fae866ec101", kill_on_drop: false }`
[INFO] [stdout] 9844521e5f895b298b3adb76a6e5b13afc41692e1f30bd229d581fae866ec101
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:819119df93c0f5eca3f29186f14981ef29945a311854d7222af07488600a2584" "/opt/rustwide/cargo-home/bin/cargo" "+394e1b40d264aa6928811919c1124fa248e7d802" "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] d91a640d0a7a519f1c2c62ad0afd194204a35fc7ff772fe50c4220219ea342e7
[INFO] running `Command { std: "docker" "start" "-a" "d91a640d0a7a519f1c2c62ad0afd194204a35fc7ff772fe50c4220219ea342e7", kill_on_drop: false }`
[INFO] [stderr]    Compiling rustc-ap-rustc_attr v666.0.0 (/opt/rustwide/workdir)
[INFO] [stderr]  Documenting rustc-ap-rustc_attr v666.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: environment variable `CFG_RELEASE_CHANNEL` not defined
[INFO] [stdout]    --> builtin.rs:655:27
[INFO] [stdout]     |
[INFO] [stdout] 655 |             let channel = env!("CFG_RELEASE_CHANNEL");
[INFO] [stdout]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: environment variable `CFG_RELEASE` not defined
[INFO] [stdout]    --> builtin.rs:657:48
[INFO] [stdout]     |
[INFO] [stdout] 657 |             let rustc_version = Version::parse(env!("CFG_RELEASE")).unwrap();
[INFO] [stdout]     |                                                ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[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] [stderr] error: Could not document `rustc-ap-rustc_attr`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name rustc_ap_rustc_attr 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 rustc_ast=/opt/rustwide/target/debug/deps/librustc_ap_rustc_ast-1a01491fe96cf2e5.rmeta --extern rustc_ast_pretty=/opt/rustwide/target/debug/deps/librustc_ap_rustc_ast_pretty-2f6cedbbdafe119c.rmeta --extern rustc_data_structures=/opt/rustwide/target/debug/deps/librustc_ap_rustc_data_structures-1515b5bd7d8dba6e.rmeta --extern rustc_errors=/opt/rustwide/target/debug/deps/librustc_ap_rustc_errors-e8f53386f4a66fc7.rmeta --extern rustc_feature=/opt/rustwide/target/debug/deps/librustc_ap_rustc_feature-8b81647212f6f20a.rmeta --extern rustc_macros=/opt/rustwide/target/debug/deps/librustc_ap_rustc_macros-e5e3975364b8b014.so --extern rustc_serialize=/opt/rustwide/target/debug/deps/librustc_ap_rustc_serialize-c29b1a534642bb21.rmeta --extern rustc_session=/opt/rustwide/target/debug/deps/librustc_ap_rustc_session-469c33dce938ebfb.rmeta --extern rustc_span=/opt/rustwide/target/debug/deps/librustc_ap_rustc_span-832d25663fb7fb20.rmeta --extern version_check=/opt/rustwide/target/debug/deps/libversion_check-d112a29c854c4f24.rmeta --cap-lints=forbid` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "d91a640d0a7a519f1c2c62ad0afd194204a35fc7ff772fe50c4220219ea342e7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d91a640d0a7a519f1c2c62ad0afd194204a35fc7ff772fe50c4220219ea342e7", kill_on_drop: false }`
[INFO] [stdout] d91a640d0a7a519f1c2c62ad0afd194204a35fc7ff772fe50c4220219ea342e7