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A closure has been used as `static`.
Erroneous code example:
```compile_fail,E0697
fn main() {
static || {}; // used as `static`
}
```
Closures cannot be used as `static`. They "save" the environment,
and as such a static closure would save only a static environment
which would consist only of variables with a static lifetime. Given
this it would be better to use a proper function. The easiest fix
is to remove the `static` keyword.
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