[INFO] fetching crate messloc 0.0.1...
[INFO] testing messloc-0.0.1 against beta-2025-09-21 for beta-1.91-3
[INFO] extracting crate messloc 0.0.1 into /workspace/builds/worker-3-tc2/source
[INFO] started tweaking crates.io crate messloc 0.0.1
[INFO] finished tweaking crates.io crate messloc 0.0.1
[INFO] tweaked toml for crates.io crate messloc 0.0.1 written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate messloc 0.0.1 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 messloc 0.0.1 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] 4503e8fac5cd2441987e2014c9ee3aaecbae0001d41bbc3dc045f2d924c6bb4f
[INFO] running `Command { std: "docker" "start" "-a" "4503e8fac5cd2441987e2014c9ee3aaecbae0001d41bbc3dc045f2d924c6bb4f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4503e8fac5cd2441987e2014c9ee3aaecbae0001d41bbc3dc045f2d924c6bb4f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4503e8fac5cd2441987e2014c9ee3aaecbae0001d41bbc3dc045f2d924c6bb4f", kill_on_drop: false }`
[INFO] [stdout] 4503e8fac5cd2441987e2014c9ee3aaecbae0001d41bbc3dc045f2d924c6bb4f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] 06e76521aff8e3cb89cabf62f431e70d594e752c39544000cfc417de9a69a477
[INFO] running `Command { std: "docker" "start" "-a" "06e76521aff8e3cb89cabf62f431e70d594e752c39544000cfc417de9a69a477", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling libc v0.2.140
[INFO] [stderr]    Compiling scopeguard v1.1.0
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling once_cell v1.17.1
[INFO] [stderr]    Compiling arrayvec v0.7.2
[INFO] [stderr]    Compiling rand_xoshiro v0.6.0
[INFO] [stderr]    Compiling lock_api v0.4.9
[INFO] [stderr]    Compiling spin v0.9.4
[INFO] [stderr]    Compiling memmap2 v0.5.8
[INFO] [stderr]    Compiling messloc v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] error: let chains are only allowed in Rust 2024 or later
[INFO] [stdout]   --> src/bitmap.rs:42:15
[INFO] [stdout]    |
[INFO] [stdout] 42 |         while let Some(bit) = iter.next() && bit_count > 0  {
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: let chains are only allowed in Rust 2024 or later
[INFO] [stdout]    --> src/global_heap.rs:555:15
[INFO] [stdout]     |
[INFO] [stdout] 555 |         while let MiniHeapId::HeapPointer(mh) = next && bytes_free < MINI_HEAP_REFILL_GOAL_SIZE {
[INFO] [stdout]     |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: let chains are only allowed in Rust 2024 or later
[INFO] [stdout]    --> src/global_heap.rs:676:15
[INFO] [stdout]     |
[INFO] [stdout] 676 |         while let MiniHeapId::HeapPointer(mh_id) = next && left_size < MAX_SPLIT_LIST_SIZE && right_size < MAX_SPLIT_LIST_SIZE
[INFO] [stdout]     |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: let chains are only allowed in Rust 2024 or later
[INFO] [stdout]    --> src/meshable_arena.rs:271:20
[INFO] [stdout]     |
[INFO] [stdout] 271 |                 if let Some(y) = x && let Some(&mh) = x.as_ref() {
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: let chains are only allowed in Rust 2024 or later
[INFO] [stdout]    --> src/meshable_arena.rs:271:39
[INFO] [stdout]     |
[INFO] [stdout] 271 |                 if let Some(y) = x && let Some(&mh) = x.as_ref() {
[INFO] [stdout]     |                                       ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: let chains are only allowed in Rust 2024 or later
[INFO] [stdout]    --> src/mini_heap.rs:360:30
[INFO] [stdout]     |
[INFO] [stdout] 360 |                   if result && let p @ &MiniHeapId::HeapPointer(val) = &$mh.next_mashed {
[INFO] [stdout]     |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]    ::: src/global_heap.rs:244:9
[INFO] [stdout]     |
[INFO] [stdout] 244 | /         crate::for_each_meshed!(mini_heap {
[INFO] [stdout] 245 | |             mini_heap as *const _ as *mut () == other
[INFO] [stdout] 246 | |
[INFO] [stdout] 247 | |         })
[INFO] [stdout]     | |__________- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `crate::for_each_meshed` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: let chains are only allowed in Rust 2024 or later
[INFO] [stdout]    --> src/mini_heap.rs:360:30
[INFO] [stdout]     |
[INFO] [stdout] 360 |                   if result && let p @ &MiniHeapId::HeapPointer(val) = &$mh.next_mashed {
[INFO] [stdout]     |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]    ::: src/global_heap.rs:282:9
[INFO] [stdout]     |
[INFO] [stdout] 282 | /         crate::for_each_meshed!(mh {
[INFO] [stdout] 283 | |             to_free[last].write(mh);
[INFO] [stdout] 284 | |             last += 1;
[INFO] [stdout] 285 | |             false
[INFO] [stdout] 286 | |         });
[INFO] [stdout]     | |__________- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `crate::for_each_meshed` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: let chains are only allowed in Rust 2024 or later
[INFO] [stdout]    --> src/mini_heap.rs:360:30
[INFO] [stdout]     |
[INFO] [stdout] 360 |                   if result && let p @ &MiniHeapId::HeapPointer(val) = &$mh.next_mashed {
[INFO] [stdout]     |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]    ::: src/global_heap.rs:779:9
[INFO] [stdout]     |
[INFO] [stdout] 779 | /         crate::for_each_meshed!(src {
[INFO] [stdout] 780 | |             let src_span = src.span_start as *mut libc::c_void;
[INFO] [stdout] 781 | |             self.arena
[INFO] [stdout] 782 | |                 .begin_mesh(src_span, dst.span_size());
[INFO] [stdout] 783 | |             false
[INFO] [stdout] 784 | |         });
[INFO] [stdout]     | |__________- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `crate::for_each_meshed` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:10:1
[INFO] [stdout]    |
[INFO] [stdout] 10 | #![feature(type_alias_impl_trait)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:11:1
[INFO] [stdout]    |
[INFO] [stdout] 11 | #![feature(let_chains)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]    |
[INFO] [stdout]    = help: the feature `let_chains` has been stable since `1.88.0` and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:12:1
[INFO] [stdout]    |
[INFO] [stdout] 12 | #![feature(maybe_uninit_uninit_array)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:13:1
[INFO] [stdout]    |
[INFO] [stdout] 13 | #![feature(maybe_uninit_array_assume_init)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:14:1
[INFO] [stdout]    |
[INFO] [stdout] 14 | #![feature(assert_matches)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:15:1
[INFO] [stdout]    |
[INFO] [stdout] 15 | #![feature(allocator_api)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:16:1
[INFO] [stdout]    |
[INFO] [stdout] 16 | #![feature(slice_ptr_len)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:17:1
[INFO] [stdout]    |
[INFO] [stdout] 17 | #![feature(ptr_metadata)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:18:1
[INFO] [stdout]    |
[INFO] [stdout] 18 | #![feature(set_ptr_value)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:19:1
[INFO] [stdout]    |
[INFO] [stdout] 19 | #![feature(ptr_as_uninit)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:20:1
[INFO] [stdout]    |
[INFO] [stdout] 20 | #![feature(if_let_guard)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `allocator_api`
[INFO] [stdout]   --> src/lib.rs:33:7
[INFO] [stdout]    |
[INFO] [stdout] 33 | #[cfg(feature = "allocator_api")]
[INFO] [stdout]    |       ^^^^^^^^^^---------------
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 help: there is a expected value with a similar name: `"allocator-api"`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected values for `feature` are: `allocator-api`
[INFO] [stdout]    = help: consider adding `allocator_api` as a feature in `Cargo.toml`
[INFO] [stdout]    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout]    = note: `#[warn(unexpected_cfgs)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `let_chains` has been stable since 1.88.0 and no longer requires an attribute to enable
[INFO] [stdout]   --> src/lib.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 11 | #![feature(let_chains)]
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `slice_ptr_len` has been stable since 1.79.0 and no longer requires an attribute to enable
[INFO] [stdout]   --> src/lib.rs:16:12
[INFO] [stdout]    |
[INFO] [stdout] 16 | #![feature(slice_ptr_len)]
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0635]: unknown feature `maybe_uninit_uninit_array`
[INFO] [stdout]   --> src/lib.rs:12:12
[INFO] [stdout]    |
[INFO] [stdout] 12 | #![feature(maybe_uninit_uninit_array)]
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no function or associated item named `uninit_array` found for union `MaybeUninit<T>` in the current scope
[INFO] [stdout]    --> src/global_heap.rs:277:82
[INFO] [stdout]     |
[INFO] [stdout] 277 |         let mut to_free: [MaybeUninit<*mut MiniHeap>; MAX_MESHES] = MaybeUninit::uninit_array();
[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/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/core/src/mem/maybe_uninit.rs:307:5
[INFO] [stdout] help: there is an associated function `uninit` with a similar name
[INFO] [stdout]     |
[INFO] [stdout] 277 -         let mut to_free: [MaybeUninit<*mut MiniHeap>; MAX_MESHES] = MaybeUninit::uninit_array();
[INFO] [stdout] 277 +         let mut to_free: [MaybeUninit<*mut MiniHeap>; MAX_MESHES] = MaybeUninit::uninit();
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0282]: type annotations needed for `[_; _]`
[INFO] [stdout]    --> src/global_heap.rs:288:13
[INFO] [stdout]     |
[INFO] [stdout] 288 |         let to_free = unsafe { MaybeUninit::array_assume_init(to_free) };
[INFO] [stdout]     |             ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 293 |             let mh = unsafe { heap.as_mut().unwrap() };
[INFO] [stdout]     |                                    ------ type must be known at this point
[INFO] [stdout]     |
[INFO] [stdout] help: consider giving `to_free` an explicit type, where the placeholders `_` are specified
[INFO] [stdout]     |
[INFO] [stdout] 288 |         let to_free: [T; N] = unsafe { MaybeUninit::array_assume_init(to_free) };
[INFO] [stdout]     |                    ++++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0282, E0554, E0599, E0635.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0282`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `messloc` (lib) due to 22 previous errors; 3 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "06e76521aff8e3cb89cabf62f431e70d594e752c39544000cfc417de9a69a477", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "06e76521aff8e3cb89cabf62f431e70d594e752c39544000cfc417de9a69a477", kill_on_drop: false }`
[INFO] [stdout] 06e76521aff8e3cb89cabf62f431e70d594e752c39544000cfc417de9a69a477
