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struct mt_blk {
    int closed;
    thread wQueue;
};
 
typedef struct mt_blk mutex;
 
#define M_INI {0,0}
void close(mutex *m);
 
int main(void)
{
    printf("%d", mutex.closed");
    return 0;
}

prog.c:3: error: expected specifier-qualifier-list before ‘thread’
prog.c: In function ‘main’:
prog.c:13: warning: implicit declaration of function ‘printf’
prog.c:13: warning: incompatible implicit declaration of built-in function ‘printf’
prog.c:13: error: expected expression before ‘mutex’
prog.c:13:30: warning: missing terminating " character
prog.c:13: error: missing terminating " character
prog.c:15: error: expected ‘;’ before ‘}’ token

Standard output is empty