#fixed code
                              public <T> LinkedBindingBuilderImpl<T> link(Key<T> key) {
    LinkedBindingBuilderImpl<T> builder =
        new LinkedBindingBuilderImpl<T>(this, key).from(source());
    linkedBindingBuilders.add(builder);
    return builder;
  }
#vulnerable code 
                              public <T> LinkedBindingBuilderImpl<T> link(Key<T> key) {
    ensureNotCreated();
    LinkedBindingBuilderImpl<T> builder =
        new LinkedBindingBuilderImpl<T>(this, key).from(source());
    linkedBindingBuilders.add(builder);
    return builder;
  } 
                            #location 2 
                            #vulnerability type THREAD_SAFETY_VIOLATION