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Guide: Add link to FFI explanation #18347

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6 changes: 3 additions & 3 deletions src/doc/guide.md
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Expand Up @@ -5288,9 +5288,9 @@ There are two circumstances where Rust's safety provisions don't work well.
The first is when interfacing with C code, and the second is when building
certain kinds of abstractions.

Rust has support for FFI (which you can read about in the [FFI
Guide](guide-ffi.html)), but can't guarantee that the C code will be safe.
Therefore, Rust marks such functions with the `unsafe`
Rust has support for [FFI](http://en.wikipedia.org/wiki/Foreign_function_interface)
(which you can read about in the [FFI Guide](guide-ffi.html)), but can't guarantee
that the C code will be safe. Therefore, Rust marks such functions with the `unsafe`
keyword, which indicates that the function may not behave properly.

Second, if you'd like to create some sort of shared-memory data structure, Rust
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