Incorrect treatment of @PolyDet("upDet") iteration

[jwaataja]

Iterating through a HashSet should always give @NonDet elements. Consider the following code.

import org.checkerframework.checker.determinism.qual.*;
import java.util.*;

public class C {
    void f(@PolyDet List<@PolyDet String> list) {
        @PolyDet("upDet") Set<@PolyDet String> set = new HashSet<>(list);
        for (String elt : set) {
            @PolyDet("up") String s = elt;
        }
    }
}

This code typechecks because the type of elt is @PolyDet("up"). This is unsound because the type of elt should be @NonDet as it's from iterating over a HashSet.

[jwaataja]

Seems to be fixed in e9403e1.