PowerShell cleanup

ps clean

$cleanup = {}
trap { &$cleanup; }

# do stuff

$cleanup = add-cleanop { <# delete stuff #> } $cleanup;

function add-cleanop($cleanop, $existing = {}) {
  { 
    try {
       &$cleanop;
    } catch {
       Write-Warning "Cleanup failed: $_";
    }
    &$existing;
  }.GetNewClosure();
}