Suggested approach: This attribute marks the point where your program starts to run. When using this attribute with one of your types need to implement a
main() method to handle setting up your program, but if you’re using SwiftUI the
App protocol provides that for you.
Estimated difficulty: Intermediate
canImport()compiler condition do?
finalkeyword do, and why would you want to use it?
#errorcompiler directive do?
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