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