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For a let term `(let ((l1 phi1) ... (ln phin)) psi[l1/phi1 ... ln/phin])` it must not be the case that `li` appears in `psi[l1/phi1 ... ln/phin]` as a free variable. This commit guarantees this by introducing a let prefix in `Logic` and modifying it whenever a new variable is introduced such that its name is a proper prefix of the current let prefix. The current let prefix is modified by postfixing it with a character different from the first character after the proper prefix in the new variable.
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Our current method of printing interpolants and models in
Interpretrelies onLogic::pp, which is a recursive implementation. This PR presents a more robust implementation calledTermPrinter, which is iterative and therefore requires a fixed-size stack. The printer still blows up thePTRefdag to a tree, similar toLogic::pp.The implementation is based on the
Rewriterclass. However, since the does not actually rewrite anything, I created aVisitorclass which allows passingLogic const &.Between
VisitorandRewritercodes there's some code duplication that maybe could be removed, but I'm not sure how right now.I didn't remove
Logic::ppbecause I think it still has its place, at least when running stuff from debugger, but maybe also (as it currently is done) for some error messages.