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simulation doesn't work

Hi all,
I try to use the simulator with a code that contains struct or union, but it doesn't seem to see members. Here is an example code:

struct chuf
{
unsigned char hi;
unsigned char lo;
};

union
{
struct chuf chi;
unsigned int both;
} buf;


void main(void)
{
buf.chi.hi =5;
buf.chi.lo =1;
buf.both =0x1122;
while (buf.both) buf.both>>=1;
}

When I try to see something like buf.both, it shows error 10. By the way, where can one see the list of simulator errors? When I look for just buf, it shows the first byte of this union. At the same time, within the memory it seems to work right.
Can anything be done about it?
Thanks,
Michael.

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