野牛中的未知字符错误

Question

当我在Ubuntu

中输入此命令时，我写了一个bison的解析器

 bison bison.txt

它会返回以下错误：

    Inspiron-N5110:~/Desktop/BisonProject$ bison bison.txt
    "bison.txt",  line 10: unknown character with code 0xd in declaration section
    "bison.txt", line 10: no input grammar
    *** Error in `bison': double free or corruption
    (!prev): 0x0000000000915780 *** Aborted (core dumped)

bison.txt：

%{ 
#include <ctype.h> 
#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include "lex.yy.c"
void yyerror(char *);
extern FILE* yyin;
extern char* yytext;
%} 

%token int_kw void_kw bool_kw open_bracket close_bracket number semicolon ID comma
%start Program

%%
Program:
    DeclarationList;

DeclarationList:
    DeclarationList Declaration | Declaration;

Declaration:
    VarDeclaration;

VarDeclaration:
    TypeSpecifier VarDecList;

VarDecList:
    VarDecList comma VarDecId | VarDecId;

VarDecId:
    ID | ID open_bracket number close_bracket  ;

TypeSpecifier:
    int_kw | void_kw | bool_kw;

%%

int main(){
  char fname[50];
  printf("Enter the name of your file:\n");
  scanf("%s",fname);

  fopen(fname,"r");

  yyparse();
  return 0;
}

void yyerror(char *s1){
  printf("%s\n",s1);
  return;
}