[INFO] fetching crate slaballoc 0.1.1...
[INFO] testing slaballoc-0.1.1 against 1.91.0 for beta-1.92-2
[INFO] extracting crate slaballoc 0.1.1 into /workspace/builds/worker-0-tc1/source
[INFO] started tweaking crates.io crate slaballoc 0.1.1
[INFO] finished tweaking crates.io crate slaballoc 0.1.1
[INFO] tweaked toml for crates.io crate slaballoc 0.1.1 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate slaballoc 0.1.1 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] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.91.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 9d7d11d94bb54c6a248af08877bbbd9b09e42842e15c17e1c1813fec75ad15db
[INFO] running `Command { std: "docker" "start" "-a" "9d7d11d94bb54c6a248af08877bbbd9b09e42842e15c17e1c1813fec75ad15db", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9d7d11d94bb54c6a248af08877bbbd9b09e42842e15c17e1c1813fec75ad15db", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9d7d11d94bb54c6a248af08877bbbd9b09e42842e15c17e1c1813fec75ad15db", kill_on_drop: false }`
[INFO] [stdout] 9d7d11d94bb54c6a248af08877bbbd9b09e42842e15c17e1c1813fec75ad15db
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] ba0e730c1cd9d62288d0780718104aa3c97f8ee07ccaf8f5a69edbb96f17dad5
[INFO] running `Command { std: "docker" "start" "-a" "ba0e730c1cd9d62288d0780718104aa3c97f8ee07ccaf8f5a69edbb96f17dad5", kill_on_drop: false }`
[INFO] [stderr]    Compiling slaballoc 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:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(allocator_api, maybe_uninit_slice)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no function or associated item named `slice_assume_init_mut` found for union `MaybeUninit<T>` in the current scope
[INFO] [stdout]   --> src/slab.rs:93:35
[INFO] [stdout]    |
[INFO] [stdout] 93 |             unsafe { MaybeUninit::slice_assume_init_mut(bitmap) }
[INFO] [stdout]    |                                   ^^^^^^^^^^^^^^^^^^^^^ function or associated item not found in `MaybeUninit<_>`
[INFO] [stdout]    |
[INFO] [stdout] note: if you're trying to build a new `MaybeUninit<_>` consider using one of the following associated functions:
[INFO] [stdout]       MaybeUninit::<T>::new
[INFO] [stdout]       MaybeUninit::<T>::uninit
[INFO] [stdout]       MaybeUninit::<T>::zeroed
[INFO] [stdout]   --> /rustc/f8297e351a40c1439a467bbbb6879088047f50b3/library/core/src/mem/maybe_uninit.rs:307:5
[INFO] [stdout] help: there is a method `assume_init_mut` with a similar name, but with different arguments
[INFO] [stdout]   --> /rustc/f8297e351a40c1439a467bbbb6879088047f50b3/library/core/src/mem/maybe_uninit.rs:899:5
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0599.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `slaballoc` (lib) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "ba0e730c1cd9d62288d0780718104aa3c97f8ee07ccaf8f5a69edbb96f17dad5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ba0e730c1cd9d62288d0780718104aa3c97f8ee07ccaf8f5a69edbb96f17dad5", kill_on_drop: false }`
[INFO] [stdout] ba0e730c1cd9d62288d0780718104aa3c97f8ee07ccaf8f5a69edbb96f17dad5