CCSv5 INTERNAL ERROR: no match for ASG

Hello
I'm using CCSv5.1 with the TI v6.0.2 compiler and I found a bug in the compiler. I managed to isolate the problem and all that is needed to reproduce is to create a "Hello World" project with CCSv5 for TMS320F28027 and write the code below.

#include <stdint.h>

/*
 * hello.c
 */
void func(uint64_t arg);

void main(void)
{
 func(5);
}

void func(uint64_t arg)
{
 int16_t buffer[4];

#if 1
 // the following lines causes INTERNAL ERROR: no match for ASG
 __byte(buffer,2) = (int)(arg >> 0);
 __byte(buffer,3) = (int)(arg >> 8);
 __byte(buffer,4) = (int)(arg >> 16);
 __byte(buffer,5) = (int)(arg >> 24);
 __byte(buffer,6) = (int)(arg >> 32);
#else
 // the following works
 uint32_t argHi, argLo;

argHi = (uint32_t)(arg >> 32);
 argLo = (uint32_t)(arg);
 __byte(buffer,2) = (int)(argLo >> 0);
 __byte(buffer,3) = (int)(argLo >> 8);
 __byte(buffer,4) = (int)(argLo >> 16);
 __byte(buffer,5) = (int)(argLo >> 24);
 __byte(buffer,6) = (int)(argHi >> 0);
#endif
}