Detect and report infinite loops #1652
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Infinite loops in the workflow don't currently give a good error message.
This PR detects loops by maintaining a stack in the recursive calls of
validate_input. If we try to validate a node that is already on the stack, it's a loop, so we fail validation with a descriptive error and return.In addition (the changes after line 650), the
extra_infois currently discarded. This change adds the extra_info from errors which have cascaded down into the final report.