Improve safety warning on ptr::swap
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@ -74,7 +74,10 @@ pub const fn null_mut<T>() -> *mut T { 0 as *mut T }
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///
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/// # Safety
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///
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/// This is only unsafe because it accepts a raw pointer.
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/// This function copies the memory through the raw pointers passed to it
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/// as arguments, which means they will be dereferenced.
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///
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/// Ensure that these pointers are valid before calling `swap`.
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#[inline]
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#[stable(feature = "rust1", since = "1.0.0")]
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pub unsafe fn swap<T>(x: *mut T, y: *mut T) {
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