[INFO] fetching crate hkalbasi-rustc-ap-rustc_data_structures 0.0.20230517...
[INFO] testing hkalbasi-rustc-ap-rustc_data_structures-0.0.20230517 against beta-2025-09-21 for beta-1.91-3
[INFO] extracting crate hkalbasi-rustc-ap-rustc_data_structures 0.0.20230517 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate hkalbasi-rustc-ap-rustc_data_structures 0.0.20230517
[INFO] finished tweaking crates.io crate hkalbasi-rustc-ap-rustc_data_structures 0.0.20230517
[INFO] tweaked toml for crates.io crate hkalbasi-rustc-ap-rustc_data_structures 0.0.20230517 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate hkalbasi-rustc-ap-rustc_data_structures 0.0.20230517 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] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 89 packages to latest compatible versions
[INFO] [stderr]       Adding bitflags v1.3.2 (available: v2.9.4)
[INFO] [stderr]       Adding elsa v1.7.1 (available: v1.11.2)
[INFO] [stderr]       Adding indexmap v1.9.3 (available: v2.11.4)
[INFO] [stderr]       Adding itertools v0.10.5 (available: v0.14.0)
[INFO] [stderr]       Adding measureme v10.1.3 (available: v12.0.3)
[INFO] [stderr]       Adding memmap2 v0.2.3 (available: v0.9.8)
[INFO] [stderr]       Adding parking_lot v0.11.2 (available: v0.12.4)
[INFO] [stderr]       Adding rustc-hash v1.1.0 (available: v2.1.1)
[INFO] [stderr]       Adding windows v0.48.0 (available: v0.62.1)
[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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] 39a4a3137ab04873190948ef086a00cd84539ce34263e61cb2c5d8ea3bac9299
[INFO] running `Command { std: "docker" "start" "-a" "39a4a3137ab04873190948ef086a00cd84539ce34263e61cb2c5d8ea3bac9299", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "39a4a3137ab04873190948ef086a00cd84539ce34263e61cb2c5d8ea3bac9299", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "39a4a3137ab04873190948ef086a00cd84539ce34263e61cb2c5d8ea3bac9299", kill_on_drop: false }`
[INFO] [stdout] 39a4a3137ab04873190948ef086a00cd84539ce34263e61cb2c5d8ea3bac9299
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] f98b2cf90b9695f0a4960bd944fb3d7dc5fa06c20ff1caaeb11d8ecbe0e23a96
[INFO] running `Command { std: "docker" "start" "-a" "f98b2cf90b9695f0a4960bd944fb3d7dc5fa06c20ff1caaeb11d8ecbe0e23a96", kill_on_drop: false }`
[INFO] [stderr]    Compiling smallvec v1.15.1
[INFO] [stderr]    Compiling indexmap v1.9.3
[INFO] [stderr]    Compiling psm v0.1.26
[INFO] [stderr]    Compiling parking_lot_core v0.8.6
[INFO] [stderr]    Compiling syn v2.0.106
[INFO] [stderr]    Compiling rustix v1.1.2
[INFO] [stderr]    Compiling stacker v0.1.21
[INFO] [stderr]    Compiling getrandom v0.3.3
[INFO] [stderr]    Compiling bitflags v2.9.4
[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/smallvec-1.15.1/src/lib.rs:96:37
[INFO] [stdout]    |
[INFO] [stdout] 96 | #![cfg_attr(feature = "may_dangle", feature(dropck_eyepatch))]
[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 `smallvec` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "f98b2cf90b9695f0a4960bd944fb3d7dc5fa06c20ff1caaeb11d8ecbe0e23a96", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f98b2cf90b9695f0a4960bd944fb3d7dc5fa06c20ff1caaeb11d8ecbe0e23a96", kill_on_drop: false }`
[INFO] [stdout] f98b2cf90b9695f0a4960bd944fb3d7dc5fa06c20ff1caaeb11d8ecbe0e23a96