code: function(node) {
          					if(node.left.type === 'Identifier' && node.left.name === 'NaN') {
          						context.report(node.left, ProblemMessages['use-isnan'], null, node.left);
          					} else if(node.right.type === 'Identifier' && node.right.name === 'NaN') {
          						context.report(node.right, ProblemMessages['use-isnan'], null, node.right);
          					}
          			}
docs: /* @callback