F # coincide con el patrón activo como tupla expandida

Question

Me sale el siguiente error en diff con un garabato rojo en Subconjunto.
Tipo no coincide. Esperando un rango - > Elección pero con un rango * Rango - > Elección

¿Hay algún tipo de anotación de tipo que pueda agregar a la coincidencia de Subconjunto para que no tenga que usar fst y snd? Si no, ¿hay alguna intención de admitir esta sintaxis?

type Range = {min : int64; max : int64}

let (|Before|After|BeforeOverlap|AfterOverlap|SuperSet|SubSet|) (x, y) = 
    if x.min > y.max then After
    elif x.min >= y.min then
        if x.max <= y.max then SubSet
        else AfterOverlap
    elif x.max < y.min then Before
    elif x.max <= y.max then BeforeOverlap
    else SuperSet

let useOldx x xe ye = ()

let diff (xe:IEnumerator<Range>) (ye:IEnumerator<Range>) =
    match xe.Current, ye.Current with
    | After as tuple -> ()
    | Before as t -> if xe.MoveNext() then useOldx (fst t) xe ye
    | SuperSet as t -> 
        let x, y = t
        if xe.MoveNext() then useOldx x xe ye
    | SubSet as x, y -> if xe.MoveNext() then useOldx x xe ye
    | _ -> ()

Answer 1

Podrías hacer esto:

    | (x,y) & SubSet -> if xe.MoveNext() then useOldx x xe ye

o podrías hacer esto:

open System.Collections.Generic 

type Range = {min : int64; max : int64}

let (|Before|After|BeforeOverlap|AfterOverlap|SuperSet|SubSet|) (x, y) = 
    if x.min > y.max then After
    elif x.min >= y.min then
        if x.max <= y.max then SubSet(x,y)
        else AfterOverlap
    elif x.max < y.min then Before
    elif x.max <= y.max then BeforeOverlap
    else SuperSet

let useOldx x xe ye = ()

let diff (xe:IEnumerator<Range>) (ye:IEnumerator<Range>) =
    match xe.Current, ye.Current with
    | After as tuple -> ()
    | Before as t -> if xe.MoveNext() then useOldx (fst t) xe ye
    | SuperSet as t -> 
        let x, y = t
        if xe.MoveNext() then useOldx x xe ye
    | SubSet(x, y) -> if xe.MoveNext() then useOldx x xe ye
    | _ -> ()