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diff --git a/third_party/rust/packed_simd/src/sealed.rs b/third_party/rust/packed_simd/src/sealed.rs
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+++ b/third_party/rust/packed_simd/src/sealed.rs
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+//! Sealed traits
+
+/// A sealed trait, this is logically private to the crate
+/// and will prevent implementations from outside the crate
+pub trait Seal<T = ()> {}
+
+/// Trait implemented by arrays that can be SIMD types.
+pub trait SimdArray: Seal {
+    /// The type of the #[repr(simd)] type.
+    type Tuple: Copy + Clone;
+    /// The element type of the vector.
+    type T;
+    /// The number of elements in the array.
+    const N: usize;
+    /// The type: `[u32; Self::N]`.
+    type NT;
+}
+
+/// This traits is used to constraint the arguments
+/// and result type of the portable shuffles.
+#[doc(hidden)]
+pub trait Shuffle<Lanes>: Seal<Lanes> {
+    // Lanes is a `[u32; N]` where `N` is the number of vector lanes
+
+    /// The result type of the shuffle.
+    type Output;
+}
+
+/// This trait is implemented by all SIMD vector types.
+pub trait Simd: Seal {
+    /// Element type of the SIMD vector
+    type Element;
+    /// The number of elements in the SIMD vector.
+    const LANES: usize;
+    /// The type: `[u32; Self::N]`.
+    type LanesType;
+}
+
+/// This trait is implemented by all mask types
+pub trait Mask: Seal {
+    fn test(&self) -> bool;
+}