[previous] 0668 [next] [U] '%s' is declared as a typedef and may not be redeclared as a member of a 'struct' or 'union' without an explicit type specifier.
Explicitly undefined REFERENCE - ISO:C90-6.5.6 Type Definitions - Semantics

An identifier which has been declared as a typedef, is being redeclared as a member of a struct or union without using an explicit type specifier. This is not permitted.

For example: 


/*PRQA S 781,783,2017,3205,3408,3602 ++*/

typedef int X;

extern void foo(void)
{
    const int X = 0;         /* Message 3334 */
    struct ST
    {
        const X;             /* Message 0668 */
        int   y;
    };
}

MISRA-C:2004 Rules applicable to message 0668:

Rule  1.2  (Required) No reliance shall be placed on undefined or unspecified behaviour.

See also:

QA·C Source Code Analyser 8.1
MISRA-C:2004 Compliance Module 3.2
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