checker/tests/nullness/Issue419.java

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

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

public 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())) {}
  }
}