IssueTracker

Partly, this is my fault -- val is not that useful in the @Model context, since @Model relies on mutability. I am used to thinking in terms of immutable viewstates and screwed this up.

However, it probably should not crash this way. Either it should work (with a never-changing value) or it should fail with a "are you *really* sure you want this here?" sort of error.

I'd like to add that declaring `canProceed` as a `var` won't crash the app.
The extension function is avoidable by just having the `get()`-getter function inside the class itself. That also avoids the crash.

Try,

@Model
data class AgreementViewState(var terms: Boolean, var privacy: Boolean) {
    val canProceed get() = terms && privacy
}

(note the addtion of get()) which seems to be what you intended. `val canProceed = terms && privacy` is not a derived property, rather, it is an initialized property.