Rust 1.81: Use #[expect] instead of #[allow] for expected lint.

Also delete no-longer-needed `#[allow]`s.

Have not converted `missing_docs` and `clippy::missing_inline_in_public_items`
due to false positives.

all-is-cubes-base/src/lib.rs

@@ -10,7 +10,7 @@
     not(any(test, feature = "arbitrary")),
     warn(clippy::std_instead_of_core, clippy::std_instead_of_alloc)
 )]
-#![cfg_attr(not(feature = "std"), allow(clippy::arc_with_non_send_sync))]
+#![cfg_attr(not(feature = "std"), expect(clippy::arc_with_non_send_sync))]
 #![warn(clippy::missing_inline_in_public_items)]
 
 #[cfg(any(feature = "std", test))]

all-is-cubes-base/src/math.rs

@@ -175,7 +175,7 @@ pub trait Geometry {
 ///
 /// The primary way in which these are used is [`Geometry::wireframe_points()`].
 #[derive(Clone, Copy, Debug, PartialEq)]
-#[allow(clippy::exhaustive_structs)]
+#[expect(clippy::exhaustive_structs)]
 pub struct LineVertex {
     /// Position of the vertex.
     pub position: FreePoint,

all-is-cubes-base/src/math/aab.rs

@@ -355,7 +355,6 @@ impl Geometry for Aab {
     where
         E: Extend<LineVertex>,
     {
-        #[allow(clippy::large_stack_arrays)]
         let mut vertices = [LineVertex::from(FreePoint::origin()); 24];
         let l = self.lower_bounds_p();
         let u = self.upper_bounds_p();

all-is-cubes-base/src/math/axis.rs

@@ -9,7 +9,7 @@ use crate::math::{Face6, Rgb};
 /// See also:
 ///
 /// * [`Face6`] specifies an axis and a direction on the axis.
-#[allow(clippy::exhaustive_enums)]
+#[expect(clippy::exhaustive_enums)]
 #[derive(Clone, Copy, Debug, Eq, Hash, PartialEq, exhaust::Exhaust)]
 #[cfg_attr(feature = "arbitrary", derive(arbitrary::Arbitrary))]
 // do after tests:#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]

all-is-cubes-base/src/math/color.rs

@@ -76,7 +76,7 @@ pub struct Rgba {
 /// Unit-of-measure type for vectors that contain color channels.
 //---
 // TODO(euclid migration): Better name?
-#[allow(clippy::exhaustive_enums)]
+#[expect(clippy::exhaustive_enums)]
 #[derive(Debug, Eq, PartialEq)]
 pub enum Intensity {}
 
@@ -669,7 +669,7 @@ const fn component_from_srgb8_const(c: u8) -> NotNan<f32> {
 /// frame.
 #[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
 #[cfg_attr(feature = "arbitrary", derive(arbitrary::Arbitrary))]
-#[allow(clippy::exhaustive_enums)]
+#[expect(clippy::exhaustive_enums)]
 #[repr(u8)]
 pub enum OpacityCategory {
     /// Alpha of zero; completely transparent; completely invisible; need not be drawn.

all-is-cubes-base/src/math/cube.rs

@@ -162,7 +162,7 @@ impl Cube {
     /// Apply a function to each coordinate independently.
     ///
     /// If a different return type is desired, use `.lower_bounds().map(f)` instead.
-    #[allow(clippy::return_self_not_must_use)]
+    #[expect(clippy::return_self_not_must_use)]
     #[inline]
     pub fn map(self, mut f: impl FnMut(GridCoordinate) -> GridCoordinate) -> Self {
         Self {

all-is-cubes-base/src/math/face.rs

@@ -24,8 +24,7 @@ use crate::math::{
 /// variant. The two enums use the same discriminant numbering.
 ///
 #[doc = include_str!("../serde-warning.md")]
-#[allow(clippy::upper_case_acronyms)]
-#[allow(clippy::exhaustive_enums)]
+#[expect(clippy::exhaustive_enums)]
 #[derive(Clone, Copy, Debug, Hash, Eq, PartialEq, exhaust::Exhaust)]
 #[cfg_attr(feature = "arbitrary", derive(arbitrary::Arbitrary))]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
@@ -52,8 +51,7 @@ pub enum Face6 {
 /// provided. The two enums use the same discriminant numbering.
 ///
 #[doc = include_str!("../serde-warning.md")]
-#[allow(clippy::upper_case_acronyms)]
-#[allow(clippy::exhaustive_enums)]
+#[expect(clippy::exhaustive_enums)]
 #[derive(Clone, Copy, Debug, Hash, Eq, PartialEq, exhaust::Exhaust)]
 #[cfg_attr(feature = "arbitrary", derive(arbitrary::Arbitrary))]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
@@ -108,7 +106,10 @@ impl Face6 {
     /// *   If all magnitudes are zero, the Z axis's sign is used. (Remember that floating-point
     ///     numbers include distinct positive and negative zeroes).
     /// *   If any coordinate is NaN, returns [`None`].
-    #[allow(unused)] // TODO: I expect to use this in block placement
+    #[cfg_attr(
+        not(test),
+        expect(dead_code, reason = "TODO: I expect to use this in block placement")
+    )]
     fn from_snapped_vector(vector: FreeVector) -> Option<Self> {
         let Vector3D { x, y, z, _unit } = vector;
 
@@ -589,7 +590,7 @@ impl TryFrom<GridVector> for Face7 {
 /// is needed, such as converting to a [`Face6`].
 #[derive(Copy, Clone, Debug, Eq, PartialEq, displaydoc::Display)]
 #[displaydoc("Face7::Within does not have a direction or axis")]
-#[allow(clippy::exhaustive_structs)]
+#[expect(clippy::exhaustive_structs)]
 pub struct Faceless;
 
 #[cfg(feature = "rerun")]
@@ -627,7 +628,7 @@ impl From<Face6> for re_types::view_coordinates::SignedAxis3 {
 }
 
 /// Container for values keyed by [`Face6`]s. Always holds exactly six elements.
-#[allow(clippy::exhaustive_structs)]
+#[expect(clippy::exhaustive_structs)]
 #[derive(Clone, Copy, Default, Hash, PartialEq, Eq, exhaust::Exhaust)]
 #[cfg_attr(feature = "arbitrary", derive(arbitrary::Arbitrary))]
 pub struct FaceMap<V> {
@@ -919,7 +920,7 @@ impl_binary_operator_for_facemap!(Rem::rem);
 /// The combination of a [`Cube`] and [`Face7`] identifying one face of it or the interior.
 /// This pattern appears in cursor selection and collision detection.
 #[derive(Clone, Copy, Hash, Eq, PartialEq)]
-#[allow(clippy::exhaustive_structs)]
+#[expect(clippy::exhaustive_structs)]
 #[allow(missing_docs)]
 pub struct CubeFace {
     pub cube: Cube,

all-is-cubes-base/src/math/matrix.rs

@@ -22,7 +22,7 @@ use crate::math::{
 /// TODO: The operators implemented for this are very incomplete.
 ///
 /// TODO(euclid migration): Can we dispose of this type now?
-#[allow(clippy::exhaustive_structs)]
+#[expect(clippy::exhaustive_structs)]
 #[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
 pub struct GridMatrix {
     /// First column
@@ -55,7 +55,7 @@ impl GridMatrix {
 
     /// Note: This takes the elements in a column-major ordering, so the argument order
     /// is transposed relative to a conventional textual display of a matrix.
-    #[allow(clippy::too_many_arguments)]
+    #[expect(clippy::too_many_arguments)]
     #[inline]
     pub const fn new(
         x0: GridCoordinate,
@@ -297,7 +297,7 @@ impl GridMatrix {
         const INVERSE_EPSILON: FreeCoordinate = 0.25 / (GridCoordinate::MAX as FreeCoordinate);
         fn try_round(v: [FreeCoordinate; 4], expected_w: FreeCoordinate) -> Option<GridVector> {
             let mut result = Vector3D::zero();
-            #[allow(clippy::needless_range_loop)]
+            #[expect(clippy::needless_range_loop)]
             for axis in 0..4 {
                 let rounded = v[axis].round();
                 let remainder = v[axis] - rounded;
@@ -312,7 +312,7 @@ impl GridMatrix {
                     2 => result.z = rounded as GridCoordinate,
                     3 =>
                     {
-                        #[allow(clippy::float_cmp)]
+                        #[expect(clippy::float_cmp)]
                         if rounded != expected_w {
                             return None;
                         }
@@ -334,7 +334,6 @@ impl GridMatrix {
 }
 
 /// Mini 4D vector for matrix rows.
-#[allow(clippy::exhaustive_structs)]
 #[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
 struct MVector4<T> {
     x: T,

all-is-cubes-base/src/math/octant.rs

@@ -11,7 +11,7 @@ use crate::math::{Cube, Face6, FreeVector, GridCoordinate, GridPoint};
 /// This enum's discriminants are not currently to be considered stable; they may be reordered.
 //---
 // TODO: Replace this with an enum.
-#[allow(clippy::exhaustive_enums)]
+#[expect(clippy::exhaustive_enums)]
 #[derive(Clone, Copy, Eq, Hash, PartialEq, exhaust::Exhaust)]
 #[cfg_attr(feature = "arbitrary", derive(arbitrary::Arbitrary))]
 #[repr(u8)]

all-is-cubes-base/src/math/rigid.rs

@@ -12,7 +12,7 @@ use crate::math::{GridAab, GridCoordinate};
 /// These transformations are always invertible except in the case of numeric overflow.
 ///
 /// [rigid transformation]: https://en.wikipedia.org/wiki/Rigid_transformation
-#[allow(clippy::exhaustive_structs)]
+#[expect(clippy::exhaustive_structs)]
 #[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
 pub struct Gridgid {
     /// Rotation component. Applied before the translation.

all-is-cubes-base/src/math/rotation.rs

@@ -31,8 +31,7 @@ use crate::math::GridAab;
 ///
 #[doc = include_str!("../serde-warning.md")]
 #[rustfmt::skip]
-#[allow(clippy::upper_case_acronyms)]
-#[allow(clippy::exhaustive_enums)]
+#[expect(clippy::exhaustive_enums)]
 #[allow(missing_docs)]
 #[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
 #[cfg_attr(feature = "arbitrary", derive(arbitrary::Arbitrary))]

all-is-cubes-base/src/math/vol.rs

@@ -20,7 +20,7 @@ use crate::math::{Axis, Cube, GridAab, GridCoordinate, GridIter, GridPoint, Grid
 ///
 /// Use this type with [`Vol`] to store volume data in this order.
 #[derive(Clone, Copy, Debug, Default, Eq, Hash, PartialEq)]
-#[allow(clippy::exhaustive_structs)]
+#[expect(clippy::exhaustive_structs)]
 pub struct ZMaj;
 
 /// Type for volume data stored in a slice, or for generating linear indexing.
@@ -191,7 +191,7 @@ where
     // TODO: Reimplement this in terms of adopting the elements as a linear array.
     // TODO: Test.
     #[doc(hidden)] // used by all-is-cubes-content
-    #[allow(clippy::needless_pass_by_value)]
+    #[expect(clippy::needless_pass_by_value)]
     pub fn from_y_flipped_array<const DX: usize, const DY: usize, const DZ: usize>(
         array: [[[V; DX]; DY]; DZ],
     ) -> Self
@@ -782,7 +782,7 @@ fn find_zmaj_subdivision(bounds: GridAab) -> Option<(GridAab, GridAab, usize)> {
         let axis_range = bounds.axis_range(axis);
         let size: u32 = bounds.size()[axis];
         if size >= 2 {
-            #[allow(clippy::cast_possible_wrap, reason = "known to fit")]
+            #[expect(clippy::cast_possible_wrap, reason = "known to fit")]
             let split_coordinate = axis_range.start + (size / 2) as i32;
 
             let mut lower_half_ub = bounds.upper_bounds();

all-is-cubes-base/src/raycast/ray.rs

@@ -19,7 +19,7 @@ use crate::math::GridAab;
 
 /// A ray; a half-infinite line segment (sometimes used as finite by the length of the
 /// direction vector).
-#[allow(clippy::exhaustive_structs)]
+#[expect(clippy::exhaustive_structs)]
 #[derive(Clone, Copy, Debug, PartialEq)]
 pub struct Ray {
     // TODO(euclid migration): should we expose the coordinate unit generic?

all-is-cubes-base/src/time.rs

@@ -40,7 +40,7 @@ impl Instant for std::time::Instant {
 /// is available **and it's okay for all time measurements to be recorded as zero**.
 #[doc(hidden)]
 #[derive(Debug, Clone, Copy, Eq, Ord, PartialEq, PartialOrd)]
-#[allow(clippy::exhaustive_structs)]
+#[expect(clippy::exhaustive_structs)]
 pub struct NoTime;
 
 impl Instant for NoTime {

all-is-cubes-base/src/util.rs

@@ -92,7 +92,7 @@ mod error_chain {
     /// which interferes with this one for [`Error`].
     #[doc(hidden)] // not something we wish to be stable public API
     #[derive(Clone, Copy, Debug)]
-    #[allow(clippy::exhaustive_structs)]
+    #[expect(clippy::exhaustive_structs)]
     pub struct ErrorChain<'a>(pub &'a (dyn Error + 'a));
 
     impl fmt::Display for ErrorChain<'_> {

all-is-cubes-base/src/util/custom_format.rs

@@ -10,7 +10,7 @@ use manyfmt::{Fmt, Refmt as _};
 /// The value is a `PhantomData` to avoid requiring an actual instance of the type.
 #[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
 #[doc(hidden)] // too specific to be good public API ... arguably should be part of refmt itself.
-#[allow(clippy::exhaustive_structs)]
+#[expect(clippy::exhaustive_structs)]
 pub struct TypeName;
 impl<T> Fmt<TypeName> for PhantomData<T> {
     fn fmt(&self, fmt: &mut fmt::Formatter<'_>, _: &TypeName) -> fmt::Result {
@@ -23,7 +23,7 @@ impl<T> Fmt<TypeName> for PhantomData<T> {
 ///
 /// This format may be on one line despite the pretty-printing option, and may lose
 /// precision or Rust syntax in favor of a short at-a-glance representation.
-#[allow(clippy::exhaustive_structs)]
+#[expect(clippy::exhaustive_structs)]
 #[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
 pub struct ConciseDebug;
 

all-is-cubes-content/src/alg.rs

@@ -154,7 +154,7 @@ pub(crate) fn space_to_space_copy(
 }
 
 /// As [`space_to_space_copy`], but producing a transaction.
-#[allow(dead_code)] // TODO: currently unused but will probably come up again...?
+#[expect(dead_code)] // TODO: currently unused but will probably come up again...?
 pub(crate) fn space_to_transaction_copy(
     src: &Space,
     src_bounds: GridAab,

all-is-cubes-content/src/animation.rs

@@ -102,7 +102,7 @@ pub(crate) struct Fire {
     blocks: [Block; 4],
     /// The bounds of this array determine the affected blocks.
     // TODO: should be using the attachment bounds instead of internally stored bounds
-    #[allow(clippy::struct_field_names)]
+    #[expect(clippy::struct_field_names)]
     fire_state: Vol<Box<[u8]>>,
     rng: Xoshiro256Plus,
     /// Time accumulation not yet equal to a whole frame.

all-is-cubes-content/src/atrium.rs

@@ -327,7 +327,6 @@ fn map_text_block(
     }
 }
 
-#[allow(clippy::too_many_arguments)]
 fn arch_row(
     space: &mut Space,
     blocks: &BlockProvider<AtriumBlocks>,

all-is-cubes-content/src/city/exhibit.rs

@@ -8,7 +8,6 @@ use all_is_cubes_ui::vui::widgets;
 
 use crate::city::CityPlanner;
 
-#[allow(clippy::type_complexity)]
 pub(crate) struct Exhibit {
     pub name: &'static str,
     pub subtitle: &'static str,

all-is-cubes-content/src/dungeon/demo_dungeon.rs

@@ -1,4 +1,4 @@
-#![allow(unused_qualifications)] // macro false positive
+#![expect(unused_qualifications)] // macro false positive
 
 use core::f64::consts::TAU;
 use core::mem;

all-is-cubes-content/src/dungeon/generic.rs

@@ -58,7 +58,7 @@ impl DungeonGrid {
     }
 
     /// Returns the volume which lies between two rooms and meets their adjoining faces.
-    #[allow(dead_code)] // TODO: superseded in use by theme-specific sizes; review if should keep
+    #[expect(dead_code)] // TODO: superseded in use by theme-specific sizes; review if should keep
     pub fn shared_wall_at(&self, room_position: Cube, face: Face6) -> GridAab {
         self.room_box_at(room_position)
             .abut(

all-is-cubes-content/src/menu.rs

@@ -65,7 +65,7 @@ pub async fn template_menu_space(
     Ok(space)
 }
 
-#[allow(clippy::needless_pass_by_value)]
+#[expect(clippy::needless_pass_by_value)]
 fn template_menu_widget_tree(
     widget_theme: &widgets::WidgetTheme,
     action: Arc<dyn Fn(&UniverseTemplate) + Send + Sync>,

all-is-cubes-content/src/template.rs

@@ -246,7 +246,7 @@ fn insert_generated_space(
 ///
 /// Pass this structure to [`UniverseTemplate::build()`].
 #[derive(Clone, Debug, Default, Eq, PartialEq)]
-#[allow(clippy::exhaustive_structs)]
+#[expect(clippy::exhaustive_structs)]
 pub struct TemplateParameters {
     /// Seed for any randomization which the template performs.
     /// Not all templates have random elements.
@@ -324,7 +324,7 @@ async fn islands(
     let size = size.unwrap_or(GridSize::new(1000, 400, 1000));
 
     // Set up dimensions
-    #[allow(clippy::cast_possible_wrap, reason = "big numbers will break anyway")]
+    #[expect(clippy::cast_possible_wrap, reason = "big numbers will break anyway")]
     let bounds = GridAab::checked_from_lower_size(
         [
             -((size.width / 2) as i32),
@@ -494,7 +494,7 @@ mod tests {
     use all_is_cubes::util::yield_progress_for_testing;
     use futures_core::future::BoxFuture;
 
-    #[allow(clippy::let_underscore_future)]
+    #[expect(clippy::let_underscore_future)]
     fn _test_build_future_is_send() {
         let _: BoxFuture<'_, _> = Box::pin(UniverseTemplate::Atrium.build::<std::time::Instant>(
             yield_progress_for_testing(),

all-is-cubes-content/src/tree.rs

@@ -16,8 +16,7 @@ use crate::LandscapeBlocks::{self, Leaves, Log};
 ///
 /// TODO: make the public version of this a struct with private contents
 #[derive(Copy, Clone, Debug, Eq, Hash, Ord, PartialEq, PartialOrd, exhaust::Exhaust)]
-#[allow(clippy::exhaustive_enums)]
-#[allow(
+#[expect(
     unnameable_types,
     reason = "TODO: this should be public with an opaque struct wrapper"
 )]
@@ -214,7 +213,7 @@ pub(crate) fn make_tree(
 
 use graph::Growph;
 mod graph {
-    #![allow(clippy::option_option)]
+    #![expect(clippy::option_option)]
 
     use super::*;
     use all_is_cubes::euclid::default::Vector3D;

all-is-cubes-desktop/src/audio.rs

@@ -13,7 +13,7 @@ use crate::Session;
 
 /// Fills the audio slot in a `DesktopSession` to actually produce audio.
 pub(crate) struct AudioOut {
-    #[allow(
+    #[expect(
         dead_code,
         reason = "eventually we're going to need this for volume control etc."
     )]
@@ -53,7 +53,7 @@ pub(crate) fn init_sound(session: &Session) -> Result<AudioOut, anyhow::Error> {
 }
 
 /// Thread function for receiving commands and executing them on `&mut AudioManager`.
-#[allow(clippy::needless_pass_by_value)]
+#[expect(clippy::needless_pass_by_value)]
 fn audio_command_thread(receiver: mpsc::Receiver<AudioCommand>, mut manager: AudioManager) {
     // TODO: better sound and more sounds
     let beep = StaticSoundData {

all-is-cubes-desktop/src/record.rs

@@ -40,7 +40,6 @@ pub(crate) struct Recorder {
 }
 
 // TODO: should this be a trait? It's also an awful lot like HeadlessRenderer, except without the image output...
-#[allow(clippy::large_enum_variant)]
 #[derive(Debug)]
 enum RecorderInner {
     Shutdown,