public IChelaType ExtractActualType(AstNode where, IChelaType type)
{
// Extract from the meta type.
if(!type.IsMetaType())
Error(where, "expected a type.");
type = ExtractMetaType(type);
// Use the default element from the type group.
if(type.IsTypeGroup())
{
TypeGroup group = (TypeGroup)type;
Structure building = group.GetDefaultType();
type = building;
if(building == null)
Error(where, "unexpected type group {0}", @group.GetDisplayName());
// Prevent ambiguity of merged type group.
building.CheckAmbiguity(where.GetPosition());
}
return type;
}
