Comments (3)
Update: an even smaller example:
class Box[type A](val get: A)
abstract class F[type A]: MkF
class MkF[T](t: T) extends F[Box[T]]
fun f[T](x: F[T]): T = if x is MkF(t) then Box(t) as x.A
//│ ╔══[ERROR] Subtyping constraint of the form `?a <: ?b` exceeded recursion depth limit (250)
//│ ╙── Note: use flag `:ex` to see internal error info.
//│ fun f: forall 'T. (x: F['T]) -> 'T
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So as we've discussed before, this seems to be happening during reconstraining after type extrusion. Recornstraining is basically a hacky plug on top of extrusion to detect type mismatches introduced by approximated skolems (in the context of first-class polymorphism).
The solution is not a low-hanging fruit. We need to rearchitect extrusion so it's done in a more principled way, accumulating all level-mismatched bounds first and extruding them all together, only reconstraining what's actually neede.
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Ok so it turns out the issue was not what I thought it was. There was a bug in extrusion, fixed in 55ae363.
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Related Issues (20)
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