Please help: STL multimap causes compiler error

Hello!

I'm using the STLport with VC 4.0.
Well, it works somehow in most cases...
However, the following lines of code produce an internal compiler error.
(I put a little more of the code in this post, because i don't know where exactly to look
for the error...!)

If anybody out there has the patience to help me with this problem, i'd be very pleased.
Here's the code:

// Typedefs for Word-List-Map
typedef map <CString, int, ltstr> word_map;
typedef pair<CString, int> wmap_data;
typedef word_map::iterator wmap_iter;

// Typedefs for Value-Map
typedef multimap <int, wmap_iter, less<int> > val_map;
typedef pair<int, wmap_iter> vmap_data;
typedef val_map::iterator vmap_iter;
typedef pair<vmap_iter, vmap_iter> vmap_range;
typedef val_map::size_type vmap_size;

// just for testing... array of character-values
// (value of 'a' or 'A' at array[0], of 'b' or 'B' at array[1], etc.)
int char_vals[27] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16,
17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27};

void CTestDoc::OnTestCreatecollection()
{
// declare the maps
word_map wmap;
val_map vmap;

// Add some strings to the word-list
CString cstr("einsaaaa");
wmap.insert (wmap_data(cstr, 0));
cstr = "zweiaaaa";
wmap.insert (wmap_data(cstr, 0));
cstr = "dreiaaaaa";
wmap.insert (wmap_data(cstr, 0));
cstr = "vieraaaaa";
wmap.insert (wmap_data(cstr, 0));
cstr = "fuenfaaaaa";
wmap.insert (wmap_data(cstr, 0));
cstr = "sechsaaaaa";
wmap.insert (wmap_data(cstr, 0));
cstr = "siebenaaaaa";
wmap.insert (wmap_data(cstr, 0));
cstr = "achtaaaaa";
wmap.insert (wmap_data(cstr, 0));
cstr = "neunaaaaa";
wmap.insert (wmap_data(cstr, 0));
cstr = "zehnaaaaa";
wmap.insert (wmap_data(cstr, 0));

// Trace the word-list
wmap_iter wit;
for (wit = wmap.begin(); wit != wmap.end(); wit++)
TRACE ("Key = %s, Value = %d\n", (*wit).first, (*wit).second);

// Now simulate a calculation of the word-values
// Iterate through the word-map and calculate each word's value
LPCTSTR buf;
int p, l, v;
AfxMessageBox ("Starting now!"); // to "measure" time
for (int repeat = 0; repeat < 10000; repeat++)
{
for (wit = wmap.begin(); wit != wmap.end(); wit++)
{
buf = LPCTSTR ((*wit).first);
v = 0;
for (l = ((*wit).first).GetLength(); l > 0; l--)
{
v += char_vals[(*(buf++) - 97)];
}
// Now enter the value in the word-map
// and make the corresponding entry in the value-map
(*wit).second = v;
vmap.insert (vmap_data(v, wit));
}
}
AfxMessageBox ("Ready!"); // to "measure" time

// check how many words have a certain value
wit = wmap.begin();
const int vl = (*wit).second;

// Get a range of words with equal values
// **************************************************
vmap_range vr = vmap.equal_range (vl);
// **************************************************
// The above line causes an internal compiler error:
// >> D:\ProgDev\STLport-3.12.3\stl\stl_pair.h(48) : fatal error C1001:
// INTERNAL COMPILER ERROR
// (compiler file '\school.tp3\test\c10\src\P2\main.c', line 413) <<
}

I have no idea, what causes this error. I already used the equal_range-function
successfully...

Appreciating any help.
Regards.
Alan.