code: public static <T extends TypeDefinition> ElementMatcher.Junction<T> declaresField(ElementMatcher<? super FieldDescription> matcher) {
          return new DeclaringFieldMatcher<T>(new CollectionItemMatcher<FieldDescription>(matcher));
      }
docs: Matches a type by a another matcher that is applied on any of its declared fields.
  
  @param matcher The matcher that is applied onto each declared field.
  @param <T>     The type of the matched object.
  @return A matcher that matches any type where another matcher is matched positively on at least on declared field.