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Program querying has become a valuable asset in the programmer's toolbox. Using dedicated querying languages, developers can reason about their source code in order to find errors, refactoring opportunities and so on. Within Smalltalk, the SOUL language has been proposed as one such language that offers a declarative and expressive means to query the source code of object-oriented programs. Ever since its inception, SOUL has been used as the underlying technique for a number of academic software engineering tools. Despite its success, one of the problems of SOUL is that, due to its backward chained implementation, it is less suited as a basis for such pro-active software tools.
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