message: Make findUnbrokenGroupForLinkedGroups iterative
diff: @@ -507,26 +507,25 @@ export default class Printer {
  findUnbrokenGroupForLinkedGroups(
  tokens: Tokens,
  ): undefined | LinkedGroupsToken | GroupToken {
  - for (const token of tokens) {
  - let group: undefined | LinkedGroupsToken | GroupToken;
  + const stacks = [tokens];
  + for (const stack of stacks) {
  + for (let token of stack) {
  switch (token.type) {
  case 'LinkedGroups':
  case 'Group':
  if (!this.isGroupBroken(token)) {
  - group = token;
  + return token;
  }
  break;
  case 'ConcatToken':
  case 'Indent':
  - case 'PositionMarker':
  - group = this.findUnbrokenGroupForLinkedGroups(token.tokens);
  + case 'PositionMarker': {
  + stacks.push(token.tokens);
  break;
  }
  -
  - if (group !== undefined) {
  - return group;
  + }
  }
  }
  