0667			[U] '%s' is declared as a typedef and may not be redeclared as an object at an inner scope without an explicit type specifier.
	Explicitly undefined				REFERENCE - ISO:C90-6.5.6 Type Definitions - Semantics

/*PRQA S 1329,2017,2051,2211,3204,3205,3220,3221,3227,3408,3447,3602 ++*/

typedef int X;

extern void foo(int n)
{
    const int X = 0;   /* Message 3334 - X is redeclared with a type specifier */

    if (n > 0)
    {
        const X;       /* Message 0667 and 3334 - X is redeclared without a type specifier */
    }
}

See also:

• 3334 This declaration of '%s' hides a more global declaration.