Function loops

src/ui-server/api/when.ts:202–210

(caller, site)

      return guardLabel(await guards(caller, site));
    },
    async loops(caller, site) {
      // Not counted against the budget: the tree is parsed for the site's
      // guards anyway, and this is a second climb up the same nodes.
      if (!site.line || !supportsBranchGuards(caller.language)) return [];
      const file = resolve(caller);
      if (!file) return [];
      const key = { line: site.line, column: typeof site.column === 'number' ? site.column : null };
      return (await loopsForFile(file.abs, file.language, [key])).get(siteKey(key)) ?? [];
    },
    async args(caller, site) {
      if (!site.line || sites >= maxSites || !supportsBranchGuards(caller.language)) return null;
      const file = resolve(caller);