checker/tests/nullness/Issue738.java

import org.checkerframework.checker.nullness.qual.NonNull;
import org.checkerframework.checker.nullness.qual.Nullable;

// Testcase for #738
// https://github.com/typetools/checker-framework/issues/738
// Also, see framework/tests/all-systems/Issue738.java
public class Issue738 {
  void methodA(int[] is, Object @Nullable [] os, int i) {
    // The type argument to methodB* for each call below is Cloneable & Serializable

    // NullnessTransfer changes the type of an argument that is assigned to a @NonNull parameter
    // to @NonNull. Use a switch statement to prevent this.
    switch (i) {
      case 1:
        methodB(is, os);
        break;
      case 2:
        // :: error: (argument)
        methodB2(is, os);
        break;
      case 3:
        // :: error: (type.argument)
        methodB3(is, os);
        break;
      case 4:
        // :: error: (type.argument)
        methodB4(is, os);
        break;
    }
  }

  <T> void methodB(T paramA, T paramB) {}

  <T> void methodB2(T paramA, @NonNull T paramB) {}

  <@NonNull T extends @NonNull Object> void methodB3(T paramA, T paramB) {}

  <T extends @NonNull Cloneable> void methodB4(T paramA, T paramB) {}
}