[INFO] fetching crate object-space 0.1.1...
[INFO] documenting object-space-0.1.1 against 1.75.0 for beta-1.76-rustdoc-1
[INFO] extracting crate object-space 0.1.1 into /workspace/builds/worker-7-tc1/source
[INFO] validating manifest of crates.io crate object-space 0.1.1 on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate object-space 0.1.1
[INFO] finished tweaking crates.io crate object-space 0.1.1
[INFO] tweaked toml for crates.io crate object-space 0.1.1 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded image v0.18.0
[INFO] [stderr]   Downloaded ordered-float v0.5.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9f46a7660c66f25586b30b10fe5ca45f4d020b8f854839f52af39e6ecfd96608
[INFO] running `Command { std: "docker" "start" "-a" "9f46a7660c66f25586b30b10fe5ca45f4d020b8f854839f52af39e6ecfd96608", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9f46a7660c66f25586b30b10fe5ca45f4d020b8f854839f52af39e6ecfd96608", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9f46a7660c66f25586b30b10fe5ca45f4d020b8f854839f52af39e6ecfd96608", kill_on_drop: false }`
[INFO] [stdout] 9f46a7660c66f25586b30b10fe5ca45f4d020b8f854839f52af39e6ecfd96608
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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" "RUSTFLAGS=--cap-lints=warn" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f8746987d5215cb78ad18a589a71fc4e6b5835b1e2ce2733bfd0c0f3044b9412
[INFO] running `Command { std: "docker" "start" "-a" "f8746987d5215cb78ad18a589a71fc4e6b5835b1e2ce2733bfd0c0f3044b9412", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.76
[INFO] [stderr]     Checking owning_ref v0.3.3
[INFO] [stderr]     Checking unreachable v1.0.0
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking num-traits v0.1.43
[INFO] [stderr]     Checking ordered-float v0.5.2
[INFO] [stderr]    Compiling quote v1.0.35
[INFO] [stderr]     Checking parking_lot_core v0.2.14
[INFO] [stderr]    Compiling syn v2.0.48
[INFO] [stderr]     Checking parking_lot v0.4.8
[INFO] [stderr]     Checking chashmap v2.2.2
[INFO] [stderr]    Compiling serde_derive v1.0.195
[INFO] [stderr]  Documenting object-space v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]    --> src/lib.rs:134:12
[INFO] [stdout]     |
[INFO] [stdout] 134 | #![feature(collections_range)]
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `object-space`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/1.75.0-x86_64-unknown-linux-gnu/bin/rustdoc --crate-type lib --crate-name object_space src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=9343bb48f83386b7 -L dependency=/opt/rustwide/target/debug/deps --extern chashmap=/opt/rustwide/target/debug/deps/libchashmap-63ae2ec9c5a334c7.rmeta --extern indexmap=/opt/rustwide/target/debug/deps/libindexmap-58405e37aead09da.rmeta --extern ordered_float=/opt/rustwide/target/debug/deps/libordered_float-4c14ec6b1c0c7ded.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-d959715fe86d3f0d.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-4ae89e9e6fc2d629.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-a16063b3c14f67da.rmeta --cap-lints=warn --crate-version 0.1.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "f8746987d5215cb78ad18a589a71fc4e6b5835b1e2ce2733bfd0c0f3044b9412", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f8746987d5215cb78ad18a589a71fc4e6b5835b1e2ce2733bfd0c0f3044b9412", kill_on_drop: false }`
[INFO] [stdout] f8746987d5215cb78ad18a589a71fc4e6b5835b1e2ce2733bfd0c0f3044b9412
