File: Issue1981.java

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// Test case for Issue 1981:
// https://github.com/typetools/checker-framework/issues/1981

import java.util.List;

class Issue1981 {

    void test(List<Integer> ids) {
        for (List<Integer> l : func2(func1(ids))) {}
    }

    static <E extends Comparable<? super E>> List<E> func1(Iterable<? extends E> elements) {
        // :: error: (return.type.incompatible)
        return null;
    }

    static <T> List<List<T>> func2(List<T> list) {
        // :: error: (return.type.incompatible)
        return null;
    }
}