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Rollup merge of #85464 - steffahn:fix_ub_in_ptr_swap_docs, r=dtolnay

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Fix UB in documented example for `ptr::swap`

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``@rustbot`` label T-doc T-libs
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Ralf Jung 2021-05-20 00:19:08 +02:00 committed by GitHub
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library/core/src/ptr/mod.rs
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@ -342,10 +342,12 @@ pub const fn slice_from_raw_parts_mut<T>(data: *mut T, len: usize) -> *mut [T] {
/// ```
/// use std::ptr;
///
/// let mut array = [0, 1, 2, 3];
/// let mut array: [i32; 4] = [0, 1, 2, 3];
///
/// let x = array[0..].as_mut_ptr() as *mut [u32; 3]; // this is `array[0..3]`
/// let y = array[1..].as_mut_ptr() as *mut [u32; 3]; // this is `array[1..4]`
/// let array_ptr: *mut i32 = array.as_mut_ptr();
///
/// let x = array_ptr as *mut [i32; 3]; // this is `array[0..3]`
/// let y = unsafe { array_ptr.add(1) } as *mut [i32; 3]; // this is `array[1..4]`
///
/// unsafe {
/// ptr::swap(x, y);