https://issues.dlang.org/show_bug.cgi?id=16569

[email protected] changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |[email protected]
         Resolution|---                         |INVALID

--- Comment #1 from [email protected] ---
It's not a bug. splitter returns a range, in your case this range is empty. 
The way of iterating/using a range is always to test for emptiness before using
front/back or popFront/Back:

auto rng = str.splitter('.');
if (!rng.empty)
    writeln(rng.back);

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