tx.origin antlr vs solc

authorization_tx_origin.ts

AuthorizationTXOrigin = function (sol_file: SolFile, plugin_config: PluginConfig): IssuePointer[] {
  const issuePointers: IssuePointer[] = [];

  parser.visit(sol_file.block, {
    BinaryOperation(b_op: any) {
      if (AstUtility.matchRegex(b_op.operator, new RegExp("==")) ||
        AstUtility.matchRegex(b_op.operator, new RegExp("!="))) {
        parser.visit(b_op, {
          MemberAccess(member: any) {
            parser.visit(b_op, {
              Identifier(identifier: any) {
                if (
                  AstUtility.matchRegex(member.memberName, new RegExp("^origin$")) &&
                  AstUtility.matchRegex(identifier.name, new RegExp("^tx$"))
                ) {
                  const location: Location = SolidityAntlr.parseLocation(member.loc, member.range);
                  issuePointers.push(new IssuePointer(plugin_config.swcID, plugin_config.descriptionShort[0], location));
                }
              },
            });
          }
        });
      }
    },
  });
  return issuePointers;
};

MemberAccess.ts

// Return true if node is the tx.origin which refers to an
// address.
function txOriginViolation(node: any, issues: Issue[]): boolean {
    const attrib = node.attributes;
    if (attrib.type !== "address") {
	return false;
    }
    if (attrib.member_name !== "origin") {
	return false
    }
    if (node.childen[0].type === "tx") {
	const mess = "Don't use `tx.origin`; Use `msg.sender` instead.";
	const issue = new Issue(node.src, "SWC-115", Severity.Warning, mess);
	issues.push(issue);
	return true;
    }
    return false;
}

Testing reveals that line 11 should be:

    if (node.children[0].attributes.type === "tx") {