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(yyuserMerge): Provide a default case if b4_mergers is empty. * tests/cxx-type.at (_AT_TEST_GLR_CXXTYPES): Define YYSTACKEXPANDABLE. * tests/glr-regression.at (Improper handling of embedded actions and dollar(-N) in GLR parsers): YYSTYPE is char *, not char const *, so that strcpy ($$, ...) works.