| # `_` expressions | |
| > **<sup>Syntax</sup>**\ | |
| > _UnderscoreExpression_ :\ | |
| > `_` | |
| Underscore expressions, denoted with the symbol `_`, are used to signify a | |
| placeholder in a destructuring assignment. They may only appear in the left-hand | |
| side of an assignment. | |
| Note that this is distinct from the [wildcard pattern](../patterns.md#wildcard-pattern). | |
| An example of an `_` expression: | |
| ```rust | |
| let p = (1, 2); | |
| let mut a = 0; | |
| (_, a) = p; | |
| ``` |