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kotlinlang

I'm learning kotlin, and was surprised when I got the error "Destructuring declarations are only allowed for local variables/values". As in, I can put  `val (a, b) = "c" to "d"` in a local context like  `main()` but not at the top/package level. I don't see anything about about this in <https://kotlinlang.org/docs/reference/multi-declarations.html> . Is there a discussion (or just a different place in the docs) I should be looking at?