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fix a small glitch in debugging output. (yyprocessOneStack, yyrecoverSyntaxError, yyparse): Print newline after YY_SYMBOL_PRINT where needed. (struct yyGLRState): Add some comments. (struct yySemanticOption): Add some comments. (union yyGLRStackItem): Add comment. (yymergeOptionSets): Correct this to properly perform the union, avoiding infinite reported by Michael Rosien. Update comment. * tests/glr-regression.at: Add test for GLR merging error reported by M. Rosien.