[INFO] fetching crate rustdoc-mcp 0.1.4...
[INFO] testing rustdoc-mcp-0.1.4 against beta-2025-09-21 for beta-1.91-3
[INFO] extracting crate rustdoc-mcp 0.1.4 into /workspace/builds/worker-5-tc2/source
[INFO] started tweaking crates.io crate rustdoc-mcp 0.1.4
[INFO] finished tweaking crates.io crate rustdoc-mcp 0.1.4
[INFO] tweaked toml for crates.io crate rustdoc-mcp 0.1.4 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate rustdoc-mcp 0.1.4 on toolchain beta-2025-09-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate rustdoc-mcp 0.1.4 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" "+beta-2025-09-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6b1847c30b9196f27ebbcb915fa8c02280a83a12dc5c3d4f0c5edd15c889d39c
[INFO] running `Command { std: "docker" "start" "-a" "6b1847c30b9196f27ebbcb915fa8c02280a83a12dc5c3d4f0c5edd15c889d39c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6b1847c30b9196f27ebbcb915fa8c02280a83a12dc5c3d4f0c5edd15c889d39c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6b1847c30b9196f27ebbcb915fa8c02280a83a12dc5c3d4f0c5edd15c889d39c", kill_on_drop: false }`
[INFO] [stdout] 6b1847c30b9196f27ebbcb915fa8c02280a83a12dc5c3d4f0c5edd15c889d39c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a04cef6ce81a724d0f62421d6618cf0bdcc0e942d5a70ff810c9f82d02258827
[INFO] running `Command { std: "docker" "start" "-a" "a04cef6ce81a724d0f62421d6618cf0bdcc0e942d5a70ff810c9f82d02258827", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.219
[INFO] [stderr]    Compiling stable_deref_trait v1.2.0
[INFO] [stderr]    Compiling libc v0.2.175
[INFO] [stderr]    Compiling writeable v0.6.1
[INFO] [stderr]    Compiling litemap v0.8.0
[INFO] [stderr]    Compiling icu_normalizer_data v2.0.0
[INFO] [stderr]    Compiling icu_properties_data v2.0.1
[INFO] [stderr]    Compiling winnow v0.7.13
[INFO] [stderr]    Compiling typeid v1.0.3
[INFO] [stderr]    Compiling utf8parse v0.2.2
[INFO] [stderr]    Compiling smallvec v1.15.1
[INFO] [stderr]    Compiling anstyle-query v1.1.4
[INFO] [stderr]    Compiling proc-macro2 v1.0.101
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]    Compiling anstyle v1.0.11
[INFO] [stderr]    Compiling is_terminal_polyfill v1.70.1
[INFO] [stderr]    Compiling heck v0.5.0
[INFO] [stderr]    Compiling colorchoice v1.0.4
[INFO] [stderr]    Compiling anstyle-parse v0.2.7
[INFO] [stderr]    Compiling regex-syntax v0.8.6
[INFO] [stderr]    Compiling equivalent v1.0.2
[INFO] [stderr]    Compiling serde_json v1.0.143
[INFO] [stderr]    Compiling hashbrown v0.15.5
[INFO] [stderr]    Compiling log v0.4.28
[INFO] [stderr]    Compiling utf8_iter v1.0.4
[INFO] [stderr]    Compiling percent-encoding v2.3.2
[INFO] [stderr]    Compiling anstream v0.6.20
[INFO] [stderr]    Compiling thiserror v2.0.16
[INFO] [stderr]    Compiling quote v1.0.40
[INFO] [stderr]    Compiling itoa v1.0.15
[INFO] [stderr]    Compiling option-ext v0.2.0
[INFO] [stderr]    Compiling toml_write v0.1.2
[INFO] [stderr]    Compiling ryu v1.0.20
[INFO] [stderr]    Compiling semver v1.0.26
[INFO] [stderr]    Compiling ref-cast v1.0.24
[INFO] [stderr]    Compiling form_urlencoded v1.2.2
[INFO] [stderr]    Compiling syn v2.0.106
[INFO] [stderr]    Compiling bitflags v2.9.4
[INFO] [stderr]    Compiling clap_lex v0.7.5
[INFO] [stderr]    Compiling same-file v1.0.6
[INFO] [stderr]    Compiling camino v1.1.12
[INFO] [stderr]    Compiling ordered-float v2.10.1
[INFO] [stderr]    Compiling indexmap v2.11.0
[INFO] [stderr]    Compiling anyhow v1.0.99
[INFO] [stderr]    Compiling strsim v0.11.1
[INFO] [stderr]    Compiling walkdir v2.5.0
[INFO] [stderr]    Compiling toml_writer v1.0.2
[INFO] [stderr]    Compiling virtue v0.0.18
[INFO] [stderr]    Compiling unicode-xid v0.2.6
[INFO] [stderr]    Compiling notify-types v2.0.0
[INFO] [stderr]    Compiling jiff v0.2.15
[INFO] [stderr]    Compiling dyn-clone v1.0.20
[INFO] [stderr]    Compiling rustc-hash v2.1.1
[INFO] [stderr]    Compiling unty v0.0.4
[INFO] [stderr]    Compiling elsa v1.11.2
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/rustc-hash-2.1.1/src/lib.rs:18:34
[INFO] [stdout]    |
[INFO] [stdout] 18 | #![cfg_attr(feature = "nightly", feature(hasher_prefixfree_extras))]
[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 `rustc-hash` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "a04cef6ce81a724d0f62421d6618cf0bdcc0e942d5a70ff810c9f82d02258827", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a04cef6ce81a724d0f62421d6618cf0bdcc0e942d5a70ff810c9f82d02258827", kill_on_drop: false }`
[INFO] [stdout] a04cef6ce81a724d0f62421d6618cf0bdcc0e942d5a70ff810c9f82d02258827