code: public void setImplicitFirstArgument(XExpression newImplicitFirstArgument)
  	{
  		if (newImplicitFirstArgument != implicitFirstArgument)
  		{
  			NotificationChain msgs = null;
  			if (implicitFirstArgument != null)
  				msgs = ((InternalEObject)implicitFirstArgument).eInverseRemove(this, EOPPOSITE_FEATURE_BASE - XbasePackage.XABSTRACT_FEATURE_CALL__IMPLICIT_FIRST_ARGUMENT, null, msgs);
  			if (newImplicitFirstArgument != null)
  				msgs = ((InternalEObject)newImplicitFirstArgument).eInverseAdd(this, EOPPOSITE_FEATURE_BASE - XbasePackage.XABSTRACT_FEATURE_CALL__IMPLICIT_FIRST_ARGUMENT, null, msgs);
  			msgs = basicSetImplicitFirstArgument(newImplicitFirstArgument, msgs);
  			if (msgs != null) msgs.dispatch();
  		}
  		else if (eNotificationRequired())
  			eNotify(new ENotificationImpl(this, Notification.SET, XbasePackage.XABSTRACT_FEATURE_CALL__IMPLICIT_FIRST_ARGUMENT, newImplicitFirstArgument, newImplicitFirstArgument));
  	}
docs: <!-- begin-user-doc -->
  <!-- end-user-doc -->
  @generated