code: public static ITargetIdentifier field(final String fieldName) {
  		return new ITargetIdentifier() {
  			public IDependencyInjector of(final Object target) {
  				return new FieldInjector(target, fieldName);
  			}
  		};
  	}
docs: Returns a target identifier that uses an injector that injects directly
  to a member field regardless of the field's visibility.
  
  @param fieldName
  The name of the field to inject.