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auto merge of #16393 : SimonSapin/rust/patch-9, r=steveklabnik

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bors 2014-08-30 23:51:25 +00:00
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src/doc/guide-ffi.md
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@ -528,8 +528,8 @@ the `libc` module, and Rust links against `libc` and `libm` by default.
# The "nullable pointer optimization"
Certain types are defined to not be `null`. This includes references (`&T`,
`&mut T`), owning pointers (`~T`), and function pointers (`extern "abi"
fn()`). When interfacing with C, pointers that might be null are often used.
`&mut T`), boxes (`Box<T>`), and function pointers (`extern "abi" fn()`).
When interfacing with C, pointers that might be null are often used.
As a special case, a generic `enum` that contains exactly two variants, one of
which contains no data and the other containing a single field, is eligible
for the "nullable pointer optimization". When such an enum is instantiated