Lists that are created in Stratego cannot have origins. (Lists that are created by the parser do have origins.)

Workaround: create custom lookups for lists (assuming one does not create empty lists).

origin-offset: list -> (start-offset, end-offset)
where
  <is-list> list;
 	(start-offset, _) := <Hd; origin-offset> list;
 	(_, end-offset)   := <last; origin-offset> list

Also used in https://github.com/metaborg/runtime-libraries/blob/master/org.spoofax.meta.runtime.libraries/task/messages.str#L168

Submitted by Daco Harkes on 26 November 2014 at 15:22