typeof and block statements

[simendsjo]

The spec doesn't mention anything about block statements in typeof 
declarations.

	//typeof({1}) a; // found } expecting ;
	//typeof({1}()) b; // same as a
	typeof(1) c; // int

I'm asking because isInputRange from std.range the idom from the b test:

template isInputRange(R)
{
     enum bool isInputRange = is(typeof(
     {
         R r;             // can define a range object
         if (r.empty) {}  // can test for empty
         r.popFront;          // can invoke next
         auto h = r.front; // can get the front of the range
     }()));
}


Also... The unittest contains
     static assert(isInputRange!(int[]));
     static assert(isInputRange!(char[]));

But arrays doesn't include these methods.. I don't understand a thing :(