private Context(Loop loop, HashSet<Node> until, TryStructure tryContext)
{
this.loop = loop;
this.until = until;
this.tryContext = tryContext;
}
public Context NewTry(TryStructure tryContext)
{
var until = this.until;
if (tryContext.Follow != null) {
until = this.until.NewAdd(tryContext.Follow);
}
return new Context(this.loop, until, tryContext);
}
public Context()
{
this.loop = null;
this.tryContext = null;
this.until = new HashSet<Node>();
}
