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They were used to get the symbol types, given a rule number, when displaying the top of the stack before a reduction. But the symbol type is available from the state stack. This has two be benefits: two tables less in the parser (making it smaller), and a more consistent use of the three stacks which will help to fuse them. * data/yacc.c (yyprhs, yyrhs): Remove. (YY_REDUCE_PRINT): Pass yyssp to yy_reduce_print. (yy_reduce_print): Take yyssp as argument. Use it, together with yystos, to get the symbol type. * tests/regression.at (Web2c Report): Remove these tables from the expected output.