Semantic line wrapping.

Author: ehuss

src/expressions/operator-expr.md

@@ -483,18 +483,15 @@ assert_eq!(values[1], 3);
 `*const T` / `*mut T` can be cast to `*const U` / `*mut U` with the following behavior:
 
 - If `T` and `U` are both sized, the pointer is returned unchanged.
-- If `T` and `U` are both unsized, the pointer is also returned unchanged. In particular,
-  the metadata is preserved exactly.
-
-    For instance, a cast from `*const [T]` to `*const [U]` preserves the number of elements.
-  Note that, as a consequence, such casts do not necessarily preserve the size of the
-  pointer's referent (e.g., casting `*const [u16]` to `*const [u8]` will result in a raw
-  pointer which refers to an object of half the size of the original). The same
-  holds for `str` and any compound type whose unsized tail is a slice type, such
-  as `struct Foo(i32, [u8])` or `(u64, Foo)`.
-- If `T` is unsized and `U` is sized, the cast discards all metadata that
-  completes the wide pointer `T` and produces a thin pointer `U` consisting
-  of the data part of the unsized pointer.
+- If `T` and `U` are both unsized, the pointer is also returned unchanged.
+  In particular, the metadata is preserved exactly.
+
+  For instance, a cast from `*const [T]` to `*const [U]` preserves the number of elements.
+  Note that, as a consequence, such casts do not necessarily preserve the size of the pointer's referent
+  (e.g., casting `*const [u16]` to `*const [u8]` will result in a raw pointer which refers to an object of half the size of the original).
+  The same holds for `str` and any compound type whose unsized tail is a slice type,
+  such as `struct Foo(i32, [u8])` or `(u64, Foo)`.
+- If `T` is unsized and `U` is sized, the cast discards all metadata that completes the wide pointer `T` and produces a thin pointer `U` consisting of the data part of the unsized pointer.
 
 ## Assignment expressions