divert(`-1')
# forloop(var, from, to, stmt) - improved version:
#   works even if VAR is not a strict macro name
#   performs sanity check that FROM is larger than TO
#   allows complex numerical expressions in TO and FROM
define(`forloop', `ifelse(eval(`($3) >= ($2)'), `1',
  `pushdef(`$1', eval(`$2'))_forloop(`$1',
    eval(`$3'), `$4')popdef(`$1')')')
define(`_forloop',
  `$3`'ifelse(indir(`$1'), `$2', `',
    `define(`$1', incr(indir(`$1')))$0($@)')')
divert`'dnl