File: Issue419.java

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// Test case for Issue 419:
// https://github.com/typetools/checker-framework/issues/419

import org.checkerframework.checker.nullness.qual.*;

class Issue419 {
    @SuppressWarnings("nullness")
    <T> @NonNull T verifyNotNull(@Nullable T o) {
        return o;
    }

    interface Pair<A, B> {
        @Nullable A getFirst();
    }

    void m(Pair<String[], int[]> p) {
        for (String s : verifyNotNull(p.getFirst())) {}
    }
}