- (General.filter (map (fun x => match x with WTypeVar v => Some v | _ => None end) vars)),
- (General.filter (map (fun x => match x with WCoerVar v => Some v | _ => None end) vars)),
- (General.filter (map (fun x => match x with WExprVar v => Some v | _ => None end) vars)),
+ (filter (map (fun x => match x with WTypeVar v => Some v | _ => None end) vars)),
+ (filter (map (fun x => match x with WCoerVar v => Some v | _ => None end) vars)),
+ (filter (map (fun x => match x with WExprVar v => Some v | _ => None end) vars)),