tests: fix bison input file Do not provide implementations in the %{...%} section, especially if the header is included elsewhere, since then the linker will complain about multiple definitions. Reported by Stefano Lattarini, <http://lists.gnu.org/archive/html/automake-patches/2012-07/msg00126.html>. * t/yacc-bison-skeleton.sh (zardoz.y): Define yylex and yyerror in the epilogue.