1 files changed, 60 insertions, 0 deletions
diff --git a/vendor/ref-cast/src/layout.rs b/vendor/ref-cast/src/layout.rs
new file mode 100644
index 00000000..55f91f8c
--- /dev/null
+++ b/vendor/ref-cast/src/layout.rs
@@ -0,0 +1,60 @@
+use core::mem;
+
+#[doc(hidden)]
+pub struct Layout<T: ?Sized>(T);
+
+#[doc(hidden)]
+pub trait LayoutUnsized<T: ?Sized> {
+    const SIZE: usize = usize::MAX;
+    const ALIGN: usize = usize::MAX;
+}
+
+impl<T: ?Sized> LayoutUnsized<T> for Layout<T> {}
+
+impl<T> Layout<T> {
+    pub const SIZE: usize = mem::size_of::<T>();
+    pub const ALIGN: usize = mem::align_of::<T>();
+}
+
+#[doc(hidden)]
+#[inline]
+pub fn assert_layout<Outer: ?Sized, Inner: ?Sized>(
+    name: &'static str,
+    outer_size: usize,
+    inner_size: usize,
+    outer_align: usize,
+    inner_align: usize,
+) {
+    if outer_size != inner_size {
+        #[cfg(no_intrinsic_type_name)]
+        panic!(
+            "unexpected size in cast to {}: {} != {}",
+            name, outer_size, inner_size,
+        );
+        #[cfg(not(no_intrinsic_type_name))]
+        panic!(
+            "unexpected size in cast from {} to {}: {} != {}",
+            core::any::type_name::<Inner>(),
+            core::any::type_name::<Outer>(),
+            inner_size,
+            outer_size,
+        );
+    }
+    if outer_align != inner_align {
+        #[cfg(no_intrinsic_type_name)]
+        panic!(
+            "unexpected alignment in cast to {}: {} != {}",
+            name, outer_align, inner_align,
+        );
+        #[cfg(not(no_intrinsic_type_name))]
+        panic!(
+            "unexpected alignment in cast from {} to {}: {} != {}",
+            core::any::type_name::<Inner>(),
+            core::any::type_name::<Outer>(),
+            inner_align,
+            outer_align,
+        );
+    }
+    #[cfg(not(no_intrinsic_type_name))]
+    let _ = name;
+}