Fix clippy lints

src/tree/mod.rs

@@ -56,6 +56,8 @@ pub trait LayoutTree {
  fn compute_child_layout(&mut self, node_id: NodeId, inputs: LayoutInput) -> LayoutOutput;
 }
 
+/// A private trait which allows us to add extra convenience methods to types which implement
+/// LayoutTree without making those methods public.
 pub(crate) trait LayoutTreeExt: LayoutTree {
  /// Compute the size of the node given the specified constraints
  #[inline(always)]

src/tree/taffy_tree/tree.rs

@@ -161,11 +161,14 @@ where
  inputs,
  style,
  Some(|known_dimensions, available_space| {
- (&mut self.measure_function)(known_dimensions, available_space, node, node_context)
+ (self.measure_function)(known_dimensions, available_space, node, node_context)
  }),
  )
  } else {
- let measure_function: Option<fn(Size<Option<f32>>, Size<AvailableSpace>) -> Size<f32>> = None;
+ /// Type inference gets confused because we're just passing None here. So we give
+ /// it a concrete type to work with (even though we never construct the inner type)
+ type DummyMeasureFunction = Option<fn(Size<Option<f32>>, Size<AvailableSpace>) -> Size<f32>>;
+ let measure_function: DummyMeasureFunction = None;
  compute_leaf_layout(inputs, style, measure_function)
  }
  }