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The forthcoming automove feature, to be properly checked, will require that we can rely on the value of a moved-from string, which is not something the C++ standard guarantees. So introduce our own wrapper. Suggested by Frank Heckenbach. https://lists.gnu.org/archive/html/bison-patches/2018-09/msg00111.html * tests/c++.at (Variants): Introduce and use a new 'string' class.