simple question about UFCS and templates...wasFound(i) works but not i.wasFound()

[WhatMeWorry]

```
    bool wasFound(I)(I result)
     {
         return(result != -1);
     }

     bool existPoint(Point b, int cost)
     {
         auto i = closed.countUntil(b);

         if(wasFound(i))   // -1 is returned if no point b is 
found in the range
```

The above compiles and executes successfully. But the following 
fails with:
app.d(179,13): Error: no property `wasFound` for `i` of type 
`long`

I thought the templated function would take care of any type.
```
     bool wasFound(I)(I result)
     {
         return(result != -1);
     }

     bool existPoint(Point b, int cost)
     {
         auto i = closed.countUntil(b);  // Note: closed

         if(i.wasFound())   // -1 is returned if no point b is 
found in the range
```