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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;
```
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