| A compile-time const variable is referring to a thread-local static variable. |
| |
| Erroneous code example: |
| |
| ```compile_fail,E0625 |
| #![feature(thread_local)] |
| |
| #[thread_local] |
| static X: usize = 12; |
| |
| const Y: usize = 2 * X; |
| ``` |
| |
| Static and const variables can refer to other const variables but a const |
| variable cannot refer to a thread-local static variable. In this example, |
| `Y` cannot refer to `X`. To fix this, the value can be extracted as a const |
| and then used: |
| |
| ``` |
| #![feature(thread_local)] |
| |
| const C: usize = 12; |
| |
| #[thread_local] |
| static X: usize = C; |
| |
| const Y: usize = 2 * C; |
| ``` |
