Support parsing functions that return Result

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (e4b5456) 98.72% compared to head (777d1aa) 99.22%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #151 +/- ## ========================================== + Coverage 98.72% 99.22% +0.49% ========================================== Files 27 27 Lines 1811 1943 +132 ========================================== + Hits 1788 1928 +140 + Misses 23 15 -8 ```

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