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This skeleton uses a single stack of state structures, so it is less likely to benefit from a stack size reduction than yacc.c (which uses several stacks: state number, value and location). But it will reduce the size of the LAC stack. This skeleton was already using int for state numbers, so, contrary to yacc.c, this brings nothing for large automata. Overall, it is still nicer to make the skeletons alike. * data/skeletons/lalr1.cc (state_type): Here.