Piraha fails to allow things like:
$thorn = "PUGH" ActiveThorns = "$thorn"
since it looks for “ActiveThorn” lines before parsing anything else of the parfile (this is in
cctk_PirahaParser line 1072.
It should not do so since the documentation http://einsteintoolkit.org/usersguide/UsersGuidech7.html#x10-320023 does not document “ActiveThorns” to be (that) special.