What does "incomplete sequence" mean

I'm getting a single report of

<code>
$4 = {__buffer = 0xc1f1c0 "\200", <incomplete sequence \302>, 
  __allocated = 224, __used = 224, __syntax = 4436732, 
  __fastmap = 0xc1f0b0 "", __translate = 0x0, re_nsub = 0, __can_be_null = 0, 
  __regs_allocated = 0, __fastmap_accurate = 1, __no_sub = 0, __not_bol = 0, 
  __not_eol = 0, __newline_anchor = 0}
</code>

while examining an array of reg_char_nl structs

<code>
struct reg_char_nl
{
    unsigned char *ext;
    regex_t tag;
};
</code>

I have yet to apply the code to my program and am wondering if
this is a bad sign. I don't get an "incomplete sequence" message from the first struct in the array.

Thanks, David