c++ error: redefinition of ‘struct ac::bd’ struct ac::bd:fg

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#include <iostream>
#include <stdio.h>

class ac
{
    public:
        class bd;
};

class ac::bd
{
    public:
        struct fg;
};

struct ac::bd:fg
{
    int a = 1;
};

int main()
{
    return 0;
}

编译时报错：
g++    -c -o class-struct.o class-struct.cpp
class-struct.cpp:16:12: error: redefinition of ‘struct ac::bd’
   16 | struct ac::bd:fg
      |            ^~
class-struct.cpp:10:11: note: previous definition of ‘struct ac::bd’
   10 | class ac::bd
      |           ^~

问题：
struct ac::bd:fg  这里少了一个':'号。

修改：
struct ac::bd::fg

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