STATUS_UNKNOWN_ERROR (2) on wrong grammar filename

[Roel Van de Paar]

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# 2011-09-01T11:40:17 # Creating MySQL table: test.table100_memory_key_pk_parts_2; engine: memory; rows: 100 .
# 2011-09-01T11:40:19 # Creating MySQL table: test.table100_memory_key_pk_parts_2_int_autoinc; engine: memory; rows: 100 .
# 2011-09-01T11:40:21 Loading Generator GenTest::Generator::FromGrammar.
Unable to open() grammar /randgen/conf/optimizer/archive/subquery_semijoin_nested2.yy: No such file or directory at lib/GenTest/Grammar.pm line 94.
# 2011-09-01T11:40:21 gentest.pl exited with exit status STATUS_UNKNOWN_ERROR (2)
2011-09-01T11:40:21 [21325] runall.pl will exit with exit status STATUS_UNKNOWN_ERROR (2)
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Maybe we could have a better exit status like STATUS_FILE_NOT_FOUND ?