function isSingleSuperCall(body) {
      return (
        body.length === 1
        && body[0].type === 'ExpressionStatement'
        && astUtil.isCallExpression(body[0].expression)
        && body[0].expression.callee.type === 'Super'
      );
    }
Checks whether a given array of statements is a single call of `super`.
@see eslint no-useless-constructor rule
@param {ASTNode[]} body - An array of statements to check.
@returns {boolean} `true` if the body is a single call of `super`.