[INFO] fetching crate midpoint 0.1.5...
[INFO] documenting midpoint-0.1.5 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate midpoint 0.1.5 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate midpoint 0.1.5 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 midpoint 0.1.5
[INFO] finished tweaking crates.io crate midpoint 0.1.5
[INFO] tweaked toml for crates.io crate midpoint 0.1.5 written to /workspace/builds/worker-12/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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded epui v0.1.1
[INFO] [stderr]   Downloaded epsi v0.1.1
[INFO] [stderr]   Downloaded primitive_promotion v0.1.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] 7ccd1d980fce42bfda7c92848eca722ab6dee8102271ae513fceaf509a184942
[INFO] running `Command { std: "docker" "start" "-a" "7ccd1d980fce42bfda7c92848eca722ab6dee8102271ae513fceaf509a184942", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7ccd1d980fce42bfda7c92848eca722ab6dee8102271ae513fceaf509a184942", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7ccd1d980fce42bfda7c92848eca722ab6dee8102271ae513fceaf509a184942", kill_on_drop: false }`
[INFO] [stdout] 7ccd1d980fce42bfda7c92848eca722ab6dee8102271ae513fceaf509a184942
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] 976d9f57c19d968a0ce0c3739da594a85249247d20955806bf22517b675435cb
[INFO] running `Command { std: "docker" "start" "-a" "976d9f57c19d968a0ce0c3739da594a85249247d20955806bf22517b675435cb", kill_on_drop: false }`
[INFO] [stderr]     Checking epui v0.1.1
[INFO] [stderr]     Checking epsi v0.1.1
[INFO] [stderr]     Checking primitive_promotion v0.1.4
[INFO] [stderr]  Documenting midpoint v0.1.5 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     feature(const_trait_impl)
[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:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     feature(const_fn_trait_bound)
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `const_fn_trait_bound` has been stable since 1.61.0 and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     feature(unchecked_math)
[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:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     feature(const_inherent_unchecked_arith)
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 5 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 `midpoint`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2021 --crate-type lib --crate-name midpoint src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=5aaf94380529e300 -L dependency=/opt/rustwide/target/debug/deps --extern epsi=/opt/rustwide/target/debug/deps/libepsi-8e2a79193fcbea0c.rmeta --extern epui=/opt/rustwide/target/debug/deps/libepui-221eef7c40270c63.rmeta --extern primitive_promotion=/opt/rustwide/target/debug/deps/libprimitive_promotion-78fbaa0889f3b770.rmeta --cap-lints=warn --crate-version 0.1.5` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "976d9f57c19d968a0ce0c3739da594a85249247d20955806bf22517b675435cb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "976d9f57c19d968a0ce0c3739da594a85249247d20955806bf22517b675435cb", kill_on_drop: false }`
[INFO] [stdout] 976d9f57c19d968a0ce0c3739da594a85249247d20955806bf22517b675435cb