E0119: A static or field can't be used this way

A selector on a type is a static, a field reference or an enum variant, and this one can't be read the way it is written: it names both a field and a static (ambiguous), it is a variant holding data used without its fields, or it needs its type arguments.

Wrong

enum Shape { Circle{R float64}, Square{S float64} }

var s = Shape.Circle

Right

enum Shape { Circle{R float64}, Square{S float64} }

var s = Shape.Circle{R: 2}