Rule 2.4 and forward declarations

[misra-c]

The use of tag in a typedef is not a violation of rule 2.4, unless the only occurrence of the tag appears in the typedef declaration.

Code:

struct A { ... };                 // compliant
typedef struct A Atype;  
Atype ax;                                  
     // no subsequent use of identifier "A"  

typedef struct B { ... } Btype;  // non-compliant
Btype bx;                              
    // no subsequent use of identifier "B"

typedef struct { ... } Ctype;   // compliant
Ctype cx;