Include tuple indexing in the Reference.
The Rust Reference should include the tuple indexing (using a number
as a field) notation; currently it is only available on
and not easily
searchable.
@@ -3557,7 +3557,8 @@ Tuple types and values are denoted by listing the types or values of their
elements, respectively, in a parenthesized, comma-separated list.
Because tuple elements don't have a name, they can only be accessed by
-pattern-matching.
+pattern-matching or by using `N` directly as a field to access the
+`N`th element.
An example of a tuple type and its use:
@@ -3566,6 +3567,7 @@ type Pair<'a> = (i32, &'a str);
let p: Pair<'static> = (10, "hello");
let (a, b) = p;
assert!(b != "world");
+assert!(p.0 == 10);
```
### Array, and Slice types
