A closure has been used as static.
Erroneous code example:
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.