checker/tests/calledmethods-lombok/LombokSingularExample.java

import java.util.List;
import lombok.Builder;
import lombok.Singular;

@Builder
public class LombokSingularExample {
  @Singular @lombok.NonNull List<Object> items;

  // This one should be permitted, because @Singular will
  // produce an empty list even if one is not specified directly.
  public static void testNoItems() {
    LombokSingularExample.builder().build();
  }

  // This call should also be permitted, even though items() is
  // not called, because the list will be automatically initialized.
  public static void testOneItem() {
    LombokSingularExample.builder().item(new Object()).build();
  }

  public static void testWithList(List<Object> l) {
    LombokSingularExample.builder().items(l).build();
  }
}