[DGD] parse_string efficiency

[Par Winzell]

> I believe there are fairly straight-forward tools out of any standard 
> computer science book on this subject that can be used to automatically 
> check for ambiguity -- somebody should implement one.

Oh -- in the past I've sometimes used Emacs macros to convert my grammar 
temporarily into YACC/BISON format and ran it through them with high 
verbosity -- gives you a long and semi-readable informative dump of how 
your grammar is constructed.

Zell

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