This is makeindex, version 2.15 [MiKTeX 2.9 64-bit] (kpathsea + Thai support).
Scanning input file loops.idx....done (427 entries accepted, 0 rejected).
Sorting entries......done (4056 comparisons).
Generating output file loops.ind....done (485 lines written, 0 warnings).
Output written in loops.ind.
Transcript written in loops.ilg.