Is there a way to test at compile-time that a constant is a compile-time constant?

Question

Given how difficult it is to know whether an arithmetic final val expression will be compiled to a compile-time constant, and how easy it is to accidentally break compile-ti

Answer 1

You phrased your question as being about determining whether a value is being in-line expanded at points of reference, but it seems though you're actually looking for a way to guarantee it. Is that correct?

If you make it a def that's annotated for in-line expansion (@inline) you might get what you want.

@inline def TwentyTwo = 22