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%option noyywrap yylineno c++ debug%x INSIDE%{        #include <iostream>%}LETTER [A-Za-z]%%<INITIAL>       "<"             BEGIN INSIDE;<INITIAL>       .|\n            ;<INSIDE>        ">"             BEGIN INITIAL;<INSIDE>        {LETTER}*       { std::cout << YYText(); }%%int main() {        FlexLexer* lexer = new yyFlexLexer();        while (lexer->yylex() != 0)                ;        return 0;}ist156897@compiladores ~ $ flex test.l; g++ -o test lex.yy.cc; ./test < text.txttest.l:11: unrecognized ruletest.l:11: unrecognized ruletest.l:11: unrecognized ruletest.l:11: unrecognized ruletest.l:13: unrecognized ruletest.l:13: unrecognized ruletest.l:13: unrecognized ruletest.l:13: unrecognized rule