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A non-constant value was used in a constant expression.
Erroneous code example:
```compile_fail,E0435
let foo = 42;
let a: [u8; foo]; // error: attempt to use a non-constant value in a constant
```
'constant' means 'a compile-time value'.
More details can be found in the [Variables and Mutability] section of the book.
[Variables and Mutability]: https://doc.rust-lang.org/book/ch03-01-variables-and-mutability.html#differences-between-variables-and-constants
To fix this error, please replace the value with a constant. Example:
```
let a: [u8; 42]; // ok!
```
Or:
```
const FOO: usize = 42;
let a: [u8; FOO]; // ok!
```
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