pretest.md

Pre-test

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Which lambda function is valid?

1. []() -> int { return 4; };
2. int [](){ return 4; };
3. auto [](){ return 4; };
4. []() -> auto {return 4; };
5. [](){ return 4; };
6. [] { return 4; }
7. [] mutable { return 4; }
8. [] -> int { return 4; }
9. int []{ return 4; }