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82c53be476
Define 'alarm' to do nothing if unistd.h is not available. Add a new rule "exp: '-' error;" to test the above change to data/yacc.c. Use 'alarm' to abort any test taking longer than 10 seconds, as it's probably looping. (AT_CHECK_CALC): Test recovery from error in new grammar rule. Also, the new yacc.c generates two fewer diagnostics for an existing test.