Comparing slice to an Array in assert

[madwebness]

I was following the documentation here: 
http://dlang.org.mirror/spec/arrays.html#slicing and I'm having a 
problem comparing the returned Slice from a function with an 
array.

Here's the simplified code:

```
import std.stdio;
import std.regex;
import std.string;
import std.array;

auto sliceIt(array[string] words_arr) {
   int i = 1;
   string word;
   while(i < words_arr.length) {
     word = words_arr[i];
     if(matchFirst(word, r"^[A-Z]+$")) { break; }
     i++;
   }
   return def_words_arr[1..i];
}

unittest {
   auto words = ["HELLO", "world", "hi", "ENDOFTHERUNWAY"];
   auto resulting_arr = sliceIt(["world", "hi"]);
   assert(resulting_arr == ["world", "hi"]);
}
```

This produces a compile-time error:

```
Error: template `std.array.array(Range)(Range r) if 
(isIterable!Range && !isAutodecodableString!Range && 
!isInfinite!Range)` is used as a type
Failed: ["~/.local/dlang/dmd-2.108.1/freebsd/bin64/dmd", 
"-debug", "-unittest", "-main", "-v", "-o-", "words.d", 
"-Idefinition"]
```

I was thinking of maybe assigning correct return type for the 
function, tried it, but got more errors produced by the compiler. 
Can someone point me to an obvious mistake or lack of 
understanding?