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use std;
import option;
fn f<T>(&o: option<T>) {
assert o == option::none;
}
fn main() {
f::<int>(option::none);
//~^ ERROR taking mut reference to static item
//~^^ ERROR illegal borrow unless pure: creating mutable alias to aliasable, immutable memory
//~^^^ NOTE impure due to access to impure function
}
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