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class A<T> {
   class B<TT> {
   }
}

typeof(A<int>.B<int>)

// Try find the matching '[', if we can't find it, we will not try to parse the string
while (current >= 0)
{
	if (typeName[current] == '[')
	{
		// break if we found matched brackets
		if (--unmatchedRightBrackets == 0) break;
	}
	else if (typeName[current] == ']')
	{
		++unmatchedRightBrackets;
	}
	else if (typeName[current] == ',' && unmatchedRightBrackets == 1)
	{
		//
		// Type name can contain nested generic types. Following is an example:
		// System.Collections.Generic.Dictionary`2[[System.String, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089], 
		//          [System.Collections.Generic.List`1[[System.Int32, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]], 
		//           mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]]
		// 
		// Spliltting by ',' won't work. We need to do first-level split by ','. 
		//
		if (current + 1 < subTypeNameEndIndex)
		{
			subTypeNames.Push(typeName.Substring(current + 1, subTypeNameEndIndex - current - 1));
		}

		subTypeNameEndIndex = current;

	}
	--current;
}