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# `_` 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.
An example of an `_` expression:
```rust
let p = (1, 2);
let mut a = 0;
(_, a) = p;
```
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