No, you can't use the discriminators (or "case tags", or "labels") as types. You can realize this via
1 2 3 4 5 6
type Expr =
| EVar of Var // Variable
| EAbs of Var * Expr // Abstraction
| EApp of Expr * Expr // Application
and Var =
| VVar of string // Variablewhere I've done some renaming to avoid ambiguities, or just get rid of the Var type and use "string" in its place.
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Why won't the following code compile? Each discriminator is implemented as a subtype of Expr under the hood. Can you not use discriminators as types?
type Expr = | Var of string // Variable | Abs of Var * Expr // Abstraction | App of Expr * Expr // Application