public override string CheckValidNarrowing(LookupCache next, LookupCache current)
{
if (current.Has(Source))
{
var parent_value = current[Source];
var union_type = AstTypeableNode.TypeFromClrType(parent_value.BackingType);
if ((union_type & Mask) == 0)
{
return(String.Format("Value for “{0}” must be to {1}, but it is {2}.", Name, Mask, union_type));
}
else
{
next[this] = parent_value;
return(null);
}
}
else
{
return(null);
}
}
public override bool NeedsLoad(LookupCache current)
{
return(current == null || !current.Has(Source) || must_unbox && current[Source].BackingType == typeof(object));
}
public override bool NeedsLoad(LookupCache current)
{
return(current == null || !current.Has(this));
}