Add support for nested SCMs

[codecov[bot]]

Codecov Report

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

Comparison is base (cfd8e39) 88.33% compared to head (289a6e0) 88.38%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #543 +/- ## ========================================== + Coverage 88.33% 88.38% +0.05% ========================================== Files 46 46 Lines 14511 14541 +30 ========================================== + Hits 12818 12852 +34 + Misses 1693 1689 -4 ```

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