Deprecate LayoutErr

Author: Jacob Hughes

library/core/src/alloc/layout.rs

@@ -393,6 +393,11 @@ impl Layout {
 }
 
 #[stable(feature = "alloc_layout", since = "1.28.0")]
+#[rustc_deprecated(
+    since = "1.51.0",
+    reason = "use LayoutError instead",
+    suggestion = "LayoutError"
+)]
 pub type LayoutErr = LayoutError;
 
 /// The parameters given to `Layout::from_size_align`

library/core/src/alloc/mod.rs

@@ -8,7 +8,15 @@ mod layout;
 #[stable(feature = "global_alloc", since = "1.28.0")]
 pub use self::global::GlobalAlloc;
 #[stable(feature = "alloc_layout", since = "1.28.0")]
-pub use self::layout::{Layout, LayoutErr};
+pub use self::layout::Layout;
+#[stable(feature = "alloc_layout", since = "1.28.0")]
+#[rustc_deprecated(
+    since = "1.51.0",
+    reason = "use LayoutError instead",
+    suggestion = "LayoutError"
+)]
+#[allow(deprecated, deprecated_in_future)]
+pub use self::layout::LayoutErr;
 
 #[stable(feature = "alloc_layout_error", since = "1.49.0")]
 pub use self::layout::LayoutError;