On 2009-10-22, at 11:57 AM, Nguyen Thai Ngoc Duy wrote:

Hi,

How can I print a parse tree, generated by parse-program from _front.scm? I don't know the underlying structure but REPL prints the result for ever, like printing a circular graph.

The problem is that the parse tree nodes have a "parent" pointer, and this introduces cycles. The structure, defined in gsc/_ptreeadt.scm would have to be turned into a real structure with a "define-type", and the "parent" field marked as unprintable: . Alternatively, you could set the readtable so that shared structures are indicated with the #n=... syntax. Also, if you only care about the S-expression which corresponds to a parse tree "x", call (parse-tree->expression x).

BTW, igsc.scm is broken because _t-c-2.scm needs targ-obj-subtype-integer from -t-c-3.scm.

OK. I'll fix this.

Marc