Dcl_var:
  'var' type=Type name=ID_VAR;

terminal ID_VAR:
  (('a'..'z') ('a'..'z' | 'A'..'Z' | '0'..'9' | '_')*) | '_';

if (context.currentNode.semanticElement.eClass.name == "Dcl_var" // getting the violated rule
	&& context?.currentNode?.previousSibling?.semanticElement.eClass.name == "Type") {  //checking that 'name' is wrong and not 'type'
   // code for returning Message
}