fix(cpp1): ensure member-as-base matches source

[JohelEGP]

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Resolves #372. Resolves #373.

Testing summary.

100% tests passed, 0 tests failed out of 684

Total Test time (real) = 107.81 sec

Acknowledgements.

• Tested thanks to https://github.com/modern-cmake/cppfront.
• The commit message uses Conventional Commits 1.0.0.