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Lokathor 2024-05-25 15:46:55 -06:00
parent 939f2671a0
commit 22668e83f6

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@ -137,10 +137,13 @@
//!
//! [^extern_fn]: this remains true for any argument/return types and any other ABI: `extern "abi" fn` (_e.g._, `extern "system" fn`)
//!
//! Under some conditions the above types `T` are also null pointer optimized when wrapped in a [`Result`][result_repr].
//!
//! [`Box<U>`]: ../../std/boxed/struct.Box.html
//! [`num::NonZero*`]: crate::num
//! [`ptr::NonNull<U>`]: crate::ptr::NonNull
//! [function call ABI]: ../primitive.fn.html#abi-compatibility
//! [result_repr]: crate::result::Result#Representation
//!
//! This is called the "null pointer optimization" or NPO.
//!