[INFO] fetching crate tmfalloc 1.0.1...
[INFO] testing tmfalloc-1.0.1 against beta-2025-10-28 for beta-1.92-2
[INFO] extracting crate tmfalloc 1.0.1 into /workspace/builds/worker-6-tc2/source
[INFO] started tweaking crates.io crate tmfalloc 1.0.1
[INFO] finished tweaking crates.io crate tmfalloc 1.0.1
[INFO] tweaked toml for crates.io crate tmfalloc 1.0.1 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate tmfalloc 1.0.1 on toolchain beta-2025-10-28
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-10-28" "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-2025-10-28" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 45 packages to latest compatible versions
[INFO] [stderr]       Adding const-str v0.5.7 (available: v0.7.0)
[INFO] [stderr]       Adding ctor v0.2.9 (available: v0.6.1)
[INFO] [stderr]       Adding nix v0.27.1 (available: v0.30.1)
[INFO] [stderr]       Adding windows v0.51.1 (available: v0.62.2)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-10-28" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bbd464df4979ea314d6139fc507b14d215e58e92e42d994f6b141b4dbb45380c
[INFO] running `Command { std: "docker" "start" "-a" "bbd464df4979ea314d6139fc507b14d215e58e92e42d994f6b141b4dbb45380c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bbd464df4979ea314d6139fc507b14d215e58e92e42d994f6b141b4dbb45380c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bbd464df4979ea314d6139fc507b14d215e58e92e42d994f6b141b4dbb45380c", kill_on_drop: false }`
[INFO] [stdout] bbd464df4979ea314d6139fc507b14d215e58e92e42d994f6b141b4dbb45380c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 736dfe1ffaadd186970f92c84438cf4a62945d6b1fb00281073f907b99fc87aa
[INFO] running `Command { std: "docker" "start" "-a" "736dfe1ffaadd186970f92c84438cf4a62945d6b1fb00281073f907b99fc87aa", kill_on_drop: false }`
[INFO] [stderr]    Compiling memoffset v0.9.1
[INFO] [stderr]    Compiling syn v2.0.108
[INFO] [stderr]    Compiling nix v0.27.1
[INFO] [stderr]    Compiling errno v0.3.14
[INFO] [stderr]    Compiling intrusive-collections v0.9.7
[INFO] [stderr]    Compiling const-str-proc-macro v0.5.7
[INFO] [stderr]    Compiling ctor v0.2.9
[INFO] [stderr]    Compiling const-str v0.5.7
[INFO] [stderr]    Compiling tmfalloc v1.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]    --> src/lib.rs:309:1
[INFO] [stdout]     |
[INFO] [stdout] 309 | / #![feature(
[INFO] [stdout] 310 | |     allocator_api,
[INFO] [stdout] 311 | |     btree_cursors,
[INFO] [stdout] 312 | |     concat_bytes,
[INFO] [stdout] ...   |
[INFO] [stdout] 317 | |     io_error_uncategorized
[INFO] [stdout] 318 | | )]
[INFO] [stdout]     | |__^
[INFO] [stdout]     |
[INFO] [stdout]     = help: the feature `const_mut_refs` has been stable since `1.83.0` and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `const_mut_refs` has been stable since 1.83.0 and no longer requires an attribute to enable
[INFO] [stdout]    --> src/lib.rs:313:5
[INFO] [stdout]     |
[INFO] [stdout] 313 |     const_mut_refs,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `tmfalloc` (lib) due to 1 previous error; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "736dfe1ffaadd186970f92c84438cf4a62945d6b1fb00281073f907b99fc87aa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "736dfe1ffaadd186970f92c84438cf4a62945d6b1fb00281073f907b99fc87aa", kill_on_drop: false }`
[INFO] [stdout] 736dfe1ffaadd186970f92c84438cf4a62945d6b1fb00281073f907b99fc87aa