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Describe (a,) vs (a) in docs #24992

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May 1, 2015
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Describe (a,) vs (a) in docs #24992

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9 changes: 8 additions & 1 deletion src/doc/reference.md
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Expand Up @@ -2431,11 +2431,18 @@ Tuples are written by enclosing zero or more comma-separated expressions in
parentheses. They are used to create [tuple-typed](#tuple-types) values.

```{.tuple}
(0,);
(0.0, 4.5);
("a", 4usize, true);
```

You can disambiguate a single-element tuple from a value in parentheses with a
comma:

```
(0,); // single-element tuple
(0); // zero in parentheses
```

### Unit expressions

The expression `()` denotes the _unit value_, the only value of the type with
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8 changes: 8 additions & 0 deletions src/doc/trpl/primitive-types.md
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Expand Up @@ -248,6 +248,14 @@ or “breaks up” the tuple, and assigns the bits to three bindings.

This pattern is very powerful, and we’ll see it repeated more later.

You can disambiguate a single-element tuple from a value in parentheses with a
comma:

```
(0,); // single-element tuple
(0); // zero in parentheses
```

## Tuple Indexing

You can also access fields of a tuple with indexing syntax:
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