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 19.3 Reentrant Example
 ======================
 
 First, an example of a reentrant scanner: 
 
          /* This scanner prints "//" comments. */
 
          %option reentrant stack noyywrap
          %x COMMENT
 
          %%
 
          "//"                 yy_push_state( COMMENT, yyscanner);
          .|\n
 
          <COMMENT>\n          yy_pop_state( yyscanner );
          <COMMENT>[^\n]+      fprintf( yyout, "%s\n", yytext);
 
          %%
 
          int main ( int argc, char * argv[] )
          {
              yyscan_t scanner;
 
              yylex_init ( &scanner );
              yylex ( scanner );
              yylex_destroy ( scanner );
          return 0;
         }
 
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