...In code above created tree and configured nodes.

Trouble in code above is: "custom initializer...

...be able to visit and rewrite AST nodes, then generate code from the AST. Ideally...

...AST traversal logic for parse time AST nodes. The
same code
 * is used for semantic...

...Node[] nodes;
}

Maybe you are interested in collecting all of the names of the nodes...

...Carlborg wrote:

Oh, there are some AST nodes that don't contain any location at...

...needs to support end locations for tokens and possibly AST nodes as well.

-- 
/Jacob Carlborg

...nodes and don't remove them, or you grew the AA and all deleted nodes...

...Error". Subsequent code does nothing with Error nodes.

(Analogously to how floating point code deals...

...with a function/delegate that creates Derived nodes instead, but how to fix the return...

...a visitor pattern to iterate over the nodes? That's how I'd solve it...