[rustc.git] / src / librustc_error_codes / error_codes / E0054.md

It is not allowed to cast to a bool.

Erroneous code example:

```compile_fail,E0054
let x = 5;

// Not allowed, won't compile
let x_is_nonzero = x as bool;
```

If you are trying to cast a numeric type to a bool, you can compare it with
zero instead:

```
let x = 5;

// Ok
let x_is_nonzero = x != 0;
```
Commit	Line	Data
60c5eb7d XL	1	It is not allowed to cast to a bool.
	2
	3	Erroneous code example:
	4
	5	```compile_fail,E0054
	6	let x = 5;
	7
	8	// Not allowed, won't compile
	9	let x_is_nonzero = x as bool;
	10	```
	11
	12	If you are trying to cast a numeric type to a bool, you can compare it with
	13	zero instead:
	14
	15	```
	16	let x = 5;
	17
	18	// Ok
	19	let x_is_nonzero = x != 0;
	20	```