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A non-`const` function was called in a `const` context.
Erroneous code example:
```compile_fail,E0015
fn create_some() -> Option<u8> {
Some(1)
}
// error: cannot call non-const fn `create_some` in constants
const FOO: Option<u8> = create_some();
```
All functions used in a `const` context (constant or static expression) must
be marked `const`.
To fix this error, you can declare `create_some` as a constant function:
```
// declared as a `const` function:
const fn create_some() -> Option<u8> {
Some(1)
}
const FOO: Option<u8> = create_some(); // no error!
```
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