[Bug c/51741] New: complicatet brakets wont compile

["digsag at web dot de" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51741

             Bug #: 51741
           Summary: complicatet brakets wont compile
    Classification: Unclassified
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: c
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: digsag@web.de


flowing structure:
typedef struct{//branch
 char what;
 void *where;      //cast to knot *
}branch;
typedef struct{//knot
 void *father;     //cast to knot *
 branch *branches;
}knot;

adressing a knot** to hand it to a subfun wont compile:


            // (*pos)
            // (      .branches)
           // (                 [i])
          // (                      .where)
  // ((knot*)                              )
// (&                                       )
   (&((knot*)((((*pos).branches)[i]).where)))

(compiler sas lvaluve needed for unary & operator)

but 

               // (*pos)
              // (      .branches)
             // (                 [i])
            // (                      .where)
          // (&                              )
 // ((knot**)                                 )
    ((knot**)(&((((*pos).branches)[i]).where)))
    ((knot**)(&((((*pos).branches)[i]).where)))
will.
both seem like legal C to me.

another one:


            // (*pos)
           // (      .branches)
          // (                 [0])
         // (                      .where)
 // ((knot*)                              )
// (                                       .father)
   (((knot*)((((*pos).branches)[0]).where)).father)=pos;

won't compile .
compiler thinks I try to adress .father for something thats not a structure or
a union. even though I castet it to a knot* before trying to adress .father.


yours
stfu&thnk