Compiler barfing on struct with map including structure as second

#include <iostream>
#include <string>
#include <map>

struct SSkill
{
    std::map< std::string, SSkill >;
    float Value;
}

int main ()
{

    SSkill Skills;

    std::string wait;
    std::cin >> wait;
}

Error is:
:\Source\working\console\test.cpp(9) : fatal error C1001: INTERNAL COMPILER
ERROR
        (compiler file 'msc1.cpp', line 2701)
         Please choose the Technical Support command on the Visual C++
         Help menu, or open the Technical Support help file for more
information

How do I go about doing this?

What I want to wind up with is a type of map that allows indentation so to
speak.

Mystic
   Unarmed
      CombatReflex
      HandToHand
      UnarmedParry
      Dodge
      Disarm
   Armed
      CombatReflex
      Swordplay
      Hooligan
Artisan
   Explosives
      Dynamite
      Caps (Bullet Shells)
      Bomb
         Crafting
         Grenades
         Detonation Blocks
            Timer triggers
            Sensor triggers
            Manual triggers
         Using
      Trapping
   Gathering
      Herbology

etc...

I thought what I was trying would be fairly simple. A map with a
std::string as the key (of the skill name) and the Skill class itself as the
value. Then I could go through and check if it had submaps.

I'm pretty sure I can do this with pointers, I.E.
    std::map< std::string, SSkill* >;
but why do I have to?