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Suggested by Eric Blake at <http://lists.gnu.org/archive/html/bison-patches/2009-04/msg00083.html>. * tests/existing.at (_AT_TEST_EXISTING_GRAMMAR): Do not complicate the code by distinguishing between a missing value and an empty string value for an optional argument. This fix is allowed by the similar fix in AT_TEST_TABLES_AND_PARSE below. * tests/local.at (_AT_TEST_TABLES_AND_PARSE): Merge into... (AT_TEST_TABLES_AND_PARSE): ... this now that the special arguments are not needed because of the following changes. Fix stale comments. Bison developers should use GNU M4 and should not use POSIXLY_CORRECT when building the test suite, so do not complicate the code by avoiding $10 and above. Do not quote an empty string value for an optional argument, and do not distinguish between a missing value and an empty string value.
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