public Expr GenUUID()
{
if (variable.id == null)
{
Val v = new Val(variable.value, Guid.NewGuid().ToString());
return(new Fun(v, expr.ApplyUUID(v).GenUUID()));
}
return(new Fun(variable, expr.GenUUID()));
}
public Expr ApplyUUID(Val a) => new App(f.ApplyUUID(a), x.ApplyUUID(a));