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* tests/calc.m4 (calc.y): Add support for `exp = exp' (non associative). Use it to check the computations. Use it to check `nonassoc' is honored. (AT_DATA_CALC_Y): Equip `calc.y' with YYERROR_VERBOSE when passed `--yyerror-verbose'. (_AT_CHECK_CALC): Adjust to this option. (_AT_CHECK_CALC_ERROR): New macro to check parse error messages.