Buggy code:
 static void test_modules ( ) { assert_true_rule ( <START_BUG> "import   \\"tests\\"   \\\n                 rule   test   {   \\\n                   condition:   tests.constants.one   +   1   ==   tests.constants.two   \\\n               }", <END_BUG> NULL ) ; assert_true_rule ( "import   \\"tests\\"   \\\n                 rule   test   {   \\\n                   condition:   tests.constants.foo   ==   \\"foo\\"   \\\n               }", NULL ) ; assert_true_rule ( "import   \\"tests\\"   \\\n                 rule   test   {   \\\n                   condition:   tests.constants.empty   ==   \\"\\"     \\\n               }", NULL ) ; assert_true_rule ( "import   \\"tests\\"   \\\n                 rule   test   {   \\\n                   condition:   tests.empty()   ==   \\"\\"     \\\n               }", NULL ) ; assert_true_rule ( "import   \\"tests\\"   \\\n                 rule   test   {   \\\n                   condition:   tests.struct_array[1].i   ==   1   \\\n               }", NULL ) ; assert_true_rule ( "import   \\"tests\\"   \\\n                 rule   test   {   \\\n                   condition:   tests.struct_array[0].i   ==   1   or   true   \\\n               }", NULL ) ; assert_true_rule ( "import   \\"tests\\"   \\\n                 rule   test   {   \\\n                   condition:   tests.integer_array[0]   ==   0   \\\n               }", NULL

Fix:
<S2SV_ModStart> { assert_true_rule ( "import <S2SV_blank> \\"tests\\" <S2SV_blank> \\\n <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> rule <S2SV_blank> test <S2SV_blank> { <S2SV_blank> \\\n <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> condition: <S2SV_blank> tests.constants.one <S2SV_blank> + <S2SV_blank> 1 <S2SV_blank> == <S2SV_blank> tests.constants.two <S2SV_blank> \\\n <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> }", NULL ) ; assert_true_rule ( "import <S2SV_blank> \\"tests\\" <S2SV_blank> \\\n <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> rule <S2SV_blank> test <S2SV_blank> { <S2SV_blank> \\\n <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> condition: <S2SV_blank> tests.constants.foo <S2SV_blank> == <S2SV_blank> \\"foo\\" <S2SV_blank> \\\n <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> }", NULL ) ; assert_true_rule ( "import <S2SV_blank> \\"tests\\" <S2SV_blank> \\\n <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> rule <S2SV_blank> test <S2SV_blank> { <S2SV_blank> \\\n <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> condition: <S2SV_blank> tests.constants.empty <S2SV_blank> == <S2SV_blank> \\"\\" <S2SV_blank> <S2SV_blank> \\\n <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> }", NULL ) ; assert_true_rule ( "import <S2SV_blank> \\"tests\\" <S2SV_blank> \\\n <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> rule <S2SV_blank> test <S2SV_blank> { <S2SV_blank> \\\n <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> <S2SV_blank> condition: <S2SV_blank> tests.empty() <S2SV_blank> == <S2SV_blank>