Enums with dependent cases

1 
enum Test {
  A = 100,
  B = Test::A as isize * 100,
  C = Test::B as isize * 100,
  D = Test::C as isize * 100,
}

I was surprised to learn that something like this compiles. However why do I need to cast each of the case as isize?

2

Because Test::A is of type Test, which can't be used with the multiplication operator. The cast gives you an integer instead.

3

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