recurrence-rules

Reporting an issue

Thank you for taking an interest in rrule! Please include the following in
your report:

• Verify that you've looked through existing issues for duplicates before
  creating a new one
• Code sample reproducing the issue. Be sure to include all input values you
  are using such as the exact RRule string and dates.
• Expected output
• Actual output

There are many places where .unwrap() is currently called.
These should be removed or replaces with the correct error handing or .expect(...) if it is very clear that it could not be triggered.

This is not needed for tests, unwrap is fine in those cases.
The effort should be mainly focused on the rrule/src/iter and rrule/src/parser folder.