Weird. I have a naive forEach function on a "custom collection" like thing, that hides its internals:

fun forEach(closure: (ValveSpan) -> Unit) {
   series.forEach(closure)
}

If I use this in a @Composable function and try to do a @Composition (Text) inside of the closure, the compose compiler won't do it (@Composable invocations can only happen from the context of a @Composable function). Using the stock forEach on normal collections is fine. Do I need to declare my custom forEach with some kind of annoation for compose to be happy using it?

You need to make your function inline

i tried that. unfortunately, the whole reason I added that was that it's a private var it's enumerating, and inline and private vars do not mix apparently?

inline

literally means it inlines the function body into the call site. So if the call site couldn’t access a private var, an inline function can’t

thanks, that works