function wfInternalLinks(ast, file, setting) {
  let msg = 'Do not use internal Google sandboxed links';
  visit(ast, 'html', function(node) {
    if (reSandboxedLink.test(node.value)) {
      file.message(msg, node);
    }
  });
}
Remark Lint Test - flags *.sandbox.google.com links.

@param {Object} ast
@param {Object} file
@param {Object} setting