[antlr-interest] Manual tree construction in 2.7.6 (buggy?)

[Micheal J]

> I construct the tree by hand like this:
> 
> decl_default!
>     : d:DEFAULT i:IDENT COMMA e:exp SEMI
> 
>        {## = #(#d, #([IF,":IF"],
>                      #([EQ_EQ,"=="],#i,#([NIL,"NIL"])),
>                      #([STMTS,"STMTS"],
>                            #([EXPR,"EXPR"], 
> #([BECOMES,"BECOMES"],#i,#e))
>                       )
>                     )
>               );
>        }
>     ;
> 
> When I dump the tree (or visualize it with antlr.astframe) I see this:
> 
> ( :DEFAULT ( :IF ( == x NIL 1) ( STMTS ( EXPR ( BECOMES x NIL 1 )))))
> 
> That is, there is a spurious "1" in the test, and a spurious 
> "NIL" in the assignment. Yet, the tree constructor looks OK 
> to me. Am I doing something wrong

Yes. You are trying to add the single IDENT node to two different AST
[sub-]trees.

You need to copy the node if you wish to use it multiple times. Use
dupTree() for that and be sure to set the first-child and next-sibling links
appropriately.

Cheers,

Micheal