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  • curprev 08:02, 3 June 2009Ha$kell talk contribs 299 bytes +299 In 2008 Dan Popa have solved The Expression Problem defined 10 year ago by P.Wadler using the new notion of Pseudoconstructors. Picture of a modular evaluator for expresions using Pseudoconstructors. You may see the various modules defining parts of the d