Updated to use rustc-check-cfg

[codecov[bot]]

Codecov Report

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

Project coverage is 99.32%. Comparing base (66ce790) to head (fedb37d).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #340 +/- ## ========================================== + Coverage 99.14% 99.32% +0.17% ========================================== Files 17 9 -8 Lines 3049 2066 -983 ========================================== - Hits 3023 2052 -971 + Misses 26 14 -12 ```

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