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→hof:const
let $old := $map($k),
$new := if($old) then $f($v, $old) else $v
return map:new(($map, map{ $k := $new }))
}
let $map := map{ 'foo' := 1 }
let $add := $insert-with(function($a, $b) {$a + $b}, ?, ?, ?),
$insert := $insert-with(hof:const#2, ?, ?, ?)
