checker/tests/nullness/Unboxing.java

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

public class Unboxing {

  @Nullable Integer f;

  public void t1() {
    // :: error: (unboxing.of.nullable)
    int l = f + 1;
    // no error, since f has been unboxed
    f.toString();
  }

  public void t2() {
    try {
      // :: error: (unboxing.of.nullable)
      int l = f + 1;
    } catch (NullPointerException npe) {
      // f is known to be null on the exception edge
      // :: error: (unboxing.of.nullable)
      int m = f + 1;
    }
    // after the merge, f cannot be null
    f.toString();
  }

  void foo(@Nullable Integer in) {
    // :: error: (unboxing.of.nullable)
    int q = in;
  }

  int bar(@Nullable Integer in) {
    // :: error: (unboxing.of.nullable)
    return in;
  }

  <T extends @Nullable Integer> int barT(T in) {
    // :: error: (unboxing.of.nullable)
    int q = in;
    // :: error: (unboxing.of.nullable)
    return in;
  }
}