E0112: A pattern doesn't fit its subject

A case pattern can't match the subject: Ok(…) on an Option, a variant of another enum, a literal of another type, or patterns joined with commas that bind variables. Vuka also reports here a match it couldn't lower because the subject's type is unknown.

Wrong

func show(o Option[int]) {
	match o {
	case Ok(x):
		fmt.Println(x)
	case _:
	}
}

Right

func show(o Option[int]) {
	match o {
	case Some(x):
		fmt.Println(x)
	case None:
	}
}