[c++] What does this error mean: "error: expected specifier-qualifier-list before 'type_name'"?

I had the same error message but the solution is different.

The compiler parses the file from top to bottom.

Make sure a struct is defined BEFORE using it into another:

typedef struct
{
    char name[50];
    wheel_t wheels[4]; //wrong, wheel_t is not defined yet
} car_t;

typedef struct
{
    int weight;
} wheel_t;

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