[INFO] fetching crate owasm-alloc 0.4.0...
[INFO] documenting owasm-alloc-0.4.0 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate owasm-alloc 0.4.0 into /workspace/builds/worker-30/source
[INFO] validating manifest of crates.io crate owasm-alloc 0.4.0 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 owasm-alloc 0.4.0
[INFO] finished tweaking crates.io crate owasm-alloc 0.4.0
[INFO] tweaked toml for crates.io crate owasm-alloc 0.4.0 written to /workspace/builds/worker-30/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] 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-30/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-30/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] dd99a7ac062d08836a9562728d03d8f8bb23f3c25a87a65bae734976ace8f999
[INFO] running `Command { std: "docker" "start" "-a" "dd99a7ac062d08836a9562728d03d8f8bb23f3c25a87a65bae734976ace8f999", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dd99a7ac062d08836a9562728d03d8f8bb23f3c25a87a65bae734976ace8f999", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dd99a7ac062d08836a9562728d03d8f8bb23f3c25a87a65bae734976ace8f999", kill_on_drop: false }`
[INFO] [stdout] dd99a7ac062d08836a9562728d03d8f8bb23f3c25a87a65bae734976ace8f999
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-30/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-30/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] 791757614c2d73d770c30d05ea9feb8d2f52b9b4b4b7daf4ee8f19a4bb659156
[INFO] running `Command { std: "docker" "start" "-a" "791757614c2d73d770c30d05ea9feb8d2f52b9b4b4b7daf4ee8f19a4bb659156", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]    Compiling wee_alloc v0.4.5
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]     Checking memory_units v0.4.0
[INFO] [stderr]  Documenting owasm-alloc v0.4.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![feature(alloc)]
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![feature(allocator_api)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0635]: unknown feature `alloc`
[INFO] [stdout]  --> src/lib.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![feature(alloc)]
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0635.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `owasm-alloc`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name owasm_alloc src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=0c83c1a4b7ae5c8c -L dependency=/opt/rustwide/target/debug/deps --extern wee_alloc=/opt/rustwide/target/debug/deps/libwee_alloc-867545a90f221752.rmeta --cap-lints=warn --crate-version 0.4.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "791757614c2d73d770c30d05ea9feb8d2f52b9b4b4b7daf4ee8f19a4bb659156", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "791757614c2d73d770c30d05ea9feb8d2f52b9b4b4b7daf4ee8f19a4bb659156", kill_on_drop: false }`
[INFO] [stdout] 791757614c2d73d770c30d05ea9feb8d2f52b9b4b4b7daf4ee8f19a4bb659156