Initializing help system before first use

The compiler evaluates most of basic functions on constants

The compiler now evaluates basic functions applied to constants and replaces the calls by the results (for instance cos(0) is replaced by 1). This improvement should have no impact on existing models except when a program executes intentionally an invalid call (e.g. ln(0)) in order to raise a mathematical error and cause a program termination: such a program will now fail to compile. Raising a mathematical error at runtime can be done by using setmatherr (available in both Mosel 6 and 7).


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