[ruby.parslet] calling parser from Goliath gives "stack level too deep"

[David Jenkins]

I have an app that uses Parslet and works fine in "normal" circumstances.
 But the same code, when called called from Goliath.response, gives me
"error: stack level too deep".

Any ideas?

I'll try and whittle down the code to a reasonable repro size in the
meantime.

Thanks

David Jenkins