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| -rw-r--r-- | src/doc/book/ffi.md | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/doc/book/ffi.md b/src/doc/book/ffi.md index 5a2ec86c12f..07b8d8e0da8 100644 --- a/src/doc/book/ffi.md +++ b/src/doc/book/ffi.md @@ -580,7 +580,7 @@ However, the language provides a workaround. As a special case, an `enum` is eligible for the "nullable pointer optimization" if it contains exactly two variants, one of which contains no data and the other contains -a single field of one of the non-nullable types listed above (or a struct containing such a type). +a field of one of the non-nullable types listed above (or a struct containing such a type). This means it is represented as a single pointer, and the non-data variant is represented as a null pointer. This is called an "optimization", but unlike other optimizations it is guaranteed to apply to eligible types. |