[rustc.git] / src / librustc_error_codes / error_codes / E0527.md

The number of elements in an array or slice pattern differed from the number of
elements in the array being matched.

Example of erroneous code:

```compile_fail,E0527
let r = &[1, 2, 3, 4];
match r {
    &[a, b] => { // error: pattern requires 2 elements but array
                 //        has 4
        println!("a={}, b={}", a, b);
    }
}
```

Ensure that the pattern is consistent with the size of the matched
array. Additional elements can be matched with `..`:

```
let r = &[1, 2, 3, 4];
match r {
    &[a, b, ..] => { // ok!
        println!("a={}, b={}", a, b);
    }
}
```
Commit	Line	Data
60c5eb7d XL	1	The number of elements in an array or slice pattern differed from the number of
	2	elements in the array being matched.
	3
	4	Example of erroneous code:
	5
	6	```compile_fail,E0527
	7	let r = &[1, 2, 3, 4];
	8	match r {
	9	&[a, b] => { // error: pattern requires 2 elements but array
	10	// has 4
	11	println!("a={}, b={}", a, b);
	12	}
	13	}
	14	```
	15
	16	Ensure that the pattern is consistent with the size of the matched
	17	array. Additional elements can be matched with `..`:
	18
	19	```
60c5eb7d XL	20	let r = &[1, 2, 3, 4];
	21	match r {
	22	&[a, b, ..] => { // ok!
	23	println!("a={}, b={}", a, b);
	24	}
	25	}
	26	```