Avoid lazy variables in the Gappa printer, as it might happen that two tasks...
Avoid lazy variables in the Gappa printer, as it might happen that two tasks do not share the same environment. See http://lists.gforge.inria.fr/pipermail/why3-commits/2011-April/000053.html for details. There are still global references to unary minus symbols, but they are now refreshed each time.
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