rust/src/test/compile-fail/issue-2063.rs

// test that autoderef of a type like this does not
// cause compiler to loop.  Note that no instances
// of such a type could ever be constructed.
enum t = @t; //~ ERROR this type cannot be instantiated

// I use an impl here because it will cause
// the compiler to attempt autoderef and then
// try to resolve the method.
impl methods for t {
    fn to_str() -> ~str { ~"t" }
}

fn new_t(x: t) {
    x.to_str();
}

fn main() {
}