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let introduces a statement

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I changes *expression* to *statement* to make more accurate, because in Rust, `let` introduces a declaration statement.
This commit is contained in:
Tang Chenglong 2016-03-18 01:17:19 +08:00
parent abb1515c53
commit 79244c3a6b
1 changed files with 2 additions and 2 deletions
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src/doc/book/variable-bindings.md
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@ -18,14 +18,14 @@ function, rather than leaving it off. Otherwise, you’ll get an error.
In many languages, a variable binding would be called a *variable*, but Rust’s
variable bindings have a few tricks up their sleeves. For example the
left-hand side of a `let` expression is a ‘[pattern][pattern]’, not a
left-hand side of a `let` statement is a ‘[pattern][pattern]’, not a
variable name. This means we can do things like:
```rust
let (x, y) = (1, 2);
```
After this expression is evaluated, `x` will be one, and `y` will be two.
After this statement is evaluated, `x` will be one, and `y` will be two.
Patterns are really powerful, and have [their own section][pattern] in the
book. We don’t need those features for now, so we’ll keep this in the back
of our minds as we go forward.