[INFO] fetching crate sparse_ranges 0.1.8...
[INFO] testing sparse_ranges-0.1.8 against 1.91.0 for beta-1.92-2
[INFO] extracting crate sparse_ranges 0.1.8 into /workspace/builds/worker-4-tc1/source
[INFO] started tweaking crates.io crate sparse_ranges 0.1.8
[INFO] finished tweaking crates.io crate sparse_ranges 0.1.8
[INFO] tweaked toml for crates.io crate sparse_ranges 0.1.8 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate sparse_ranges 0.1.8 on toolchain 1.91.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.91.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate sparse_ranges 0.1.8 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.91.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded gen_ops v0.4.0
[INFO] [stderr]   Downloaded range-set-blaze v0.4.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e4d10ebadea8fe3e5f288209f325ebfbe76fb853c1933c0e00e0133782d3471e
[INFO] running `Command { std: "docker" "start" "-a" "e4d10ebadea8fe3e5f288209f325ebfbe76fb853c1933c0e00e0133782d3471e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e4d10ebadea8fe3e5f288209f325ebfbe76fb853c1933c0e00e0133782d3471e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e4d10ebadea8fe3e5f288209f325ebfbe76fb853c1933c0e00e0133782d3471e", kill_on_drop: false }`
[INFO] [stdout] e4d10ebadea8fe3e5f288209f325ebfbe76fb853c1933c0e00e0133782d3471e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4f72ec708f46cdafacb9d7d55c953c6b0376674a18d0ce4f43082be3cd45104d
[INFO] running `Command { std: "docker" "start" "-a" "4f72ec708f46cdafacb9d7d55c953c6b0376674a18d0ce4f43082be3cd45104d", kill_on_drop: false }`
[INFO] [stderr]    Compiling thiserror-impl v2.0.17
[INFO] [stderr]    Compiling http-range-header v0.4.2
[INFO] [stderr]    Compiling thiserror v2.0.17
[INFO] [stderr]    Compiling sparse_ranges v0.1.8 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(btree_cursors)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `sparse_ranges` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "4f72ec708f46cdafacb9d7d55c953c6b0376674a18d0ce4f43082be3cd45104d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4f72ec708f46cdafacb9d7d55c953c6b0376674a18d0ce4f43082be3cd45104d", kill_on_drop: false }`
[INFO] [stdout] 4f72ec708f46cdafacb9d7d55c953c6b0376674a18d0ce4f43082be3cd45104d
