private static Scope Read(Scope _, OrExp x)
{
var scopes2 = x.Scopes
.Select(Read)
.SelectMany(s => s.Exp switch
{
OrExp y => y.Scopes.AsEnumerable(),
_ => new[] { s }
})
int _GetHashCode(OrExp x)
=> HashCode.Combine(
typeof(OrExp),
x.Scopes);
bool _Equals(OrExp l, OrExp r) => l.Scopes.Equals(r.Scopes);