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whether the reducion was empty or not. This leaves room to improve the use of YYLLOC_DEFAULT in such a case. lalr1.cc is still experimental, so changing this is acceptable. And finally, there are probably not many users who changed the handling of locations in GLR, so changing is admissible too. * data/glr.c, data/lalr1.cc, data/yacc.c (YYLLOC_DEFAULT): On an empty reduction, set @$ to an empty location ending the previously stacked symbol. Adjust uses to make sure the code is triggered on empty reductions. * tests/actions.at (_AT_CHECK_PRINTER_AND_DESTRUCTOR): Adjust the expected output: empty reductions have empty locations.
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