explicitly talk about integer literals

Author: RalfJung

library/alloc/src/boxed.rs

@@ -63,9 +63,9 @@
 //! [`Global`] allocator with [`Layout::for_value(&*value)`].
 //!
 //! For zero-sized values, the `Box` pointer still has to be [valid] for reads and writes and
-//! sufficiently aligned. In particular, casting any aligned non-zero integer to a raw pointer
-//! produces a valid pointer, but a pointer pointing into previously allocated memory that since got
-//! freed is not valid.
+//! sufficiently aligned. In particular, casting any aligned non-zero integer literal to a raw
+//! pointer produces a valid pointer, but a pointer pointing into previously allocated memory that
+//! since got freed is not valid.
 //!
 //! So long as `T: Sized`, a `Box<T>` is guaranteed to be represented
 //! as a single pointer and is also ABI-compatible with C pointers

library/core/src/ptr/mod.rs

@@ -21,10 +21,10 @@
 //!   within the bounds of a single allocated object. Note that in Rust,
 //!   every (stack-allocated) variable is considered a separate allocated object.
 //! * Even for operations of [size zero][zst], the pointer must not be "dangling" in the sense of
-//!   pointing to deallocated memory. However, casting any non-zero integer to a pointer is valid
-//!   for zero-sized accesses. This corresponds to writing your own allocator; allocating zero-sized
-//!   objects is not very hard. In contrast, when you use the standard allocator, after memory got
-//!   deallocated, even zero-sized accesses to that memory are invalid.
+//!   pointing to deallocated memory. However, casting any non-zero integer literal to a pointer is
+//!   valid for zero-sized accesses. This corresponds to writing your own allocator; allocating
+//!   zero-sized objects is not very hard. In contrast, when you use the standard allocator, after
+//!   memory got deallocated, even zero-sized accesses to that memory are invalid.
 //! * All accesses performed by functions in this module are *non-atomic* in the sense
 //!   of [atomic operations] used to synchronize between threads. This means it is
 //!   undefined behavior to perform two concurrent accesses to the same location from different