File: CombineFacts.java

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import org.checkerframework.checker.index.qual.LTLengthOf;

@SuppressWarnings("lowerbound")
class CombineFacts {
    void test(int[] a1) {
        @LTLengthOf("a1") int len = a1.length - 1;
        int[] a2 = new int[len];
        a2[len - 1] = 1;
        a1[len] = 1;

        // This access should issue an error.
        // :: error: (array.access.unsafe.high)
        a2[len] = 1;
    }
}