public static IParsingTreeTerminal FindFirstTerminal(IParsingTreeNode node)
{
var visitor = new FirstTerminalSearcher();
node.Visit(visitor);
return(visitor.Result);
}
static Location?GetFromLocation(this IParsingTreeNode node)
{
var t = FirstTerminalSearcher.FindFirstTerminal(node);
return(t == null ? null : (Location?)t.From);
}