code: protected Boolean _hasSideEffects(XVariableDeclaration expression, ISideEffectContext context) {
  		if (hasSideEffects(expression.getRight(), context)) {
  			return true;
  		}
  		context.declareVariable(expression.getIdentifier(), expression.getRight());
  		return false;
  	}
docs: Test if the given expression has side effects.
  
  @param expression the expression.
  @param context the list of context expressions.
  @return {@code true} if the expression has side effects.