Comment (by Steven R. Brandt):

The thing that confused the parser was the empty assignment to out_dir. It was looking for the value of output_dir, and found ActiveThorns. Should we disallow empty RHS?

At the moment, I’m working to fix the line number issue.

IO::out_dir =

‌

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2533/activethorns-not-accepted-in-parameter