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/** Error handling with associated line number. This can be modified to
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* output the error e.g. to a dialog box. */
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/** Pointer to the current lexer instance, this is used to connect the
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* parser to the scanner. It is used in the yylex macro. */
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/** Reference to the context filled during parsing of the expressions. */
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/** Contains the list of statements to execute. */
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/** The thread in which this driver is included. */