Can you shrink it further?

[Andrei Alexandrescu via Digitalmars-d]

On 10/09/2016 10:55 PM, safety0ff wrote:
> On Sunday, 9 October 2016 at 22:11:50 UTC, Andrei Alexandrescu wrote:
>> I suspect there are cleverer things that can be done.
>
> Less clever seemed to work for me:
>
> void popFront1(ref char[] s) @trusted pure nothrow {
>   immutable c = s[0];
>   if (c < 0x80 || c >= 0xFE) {
>     s = s.ptr[1 .. s.length];
>   } else {
>     import core.bitop;
>     size_t i = 7u - bsr(~c); // N.B. changed uint to size_t
>     import std.algorithm;
>     s = s.ptr[min(i, s.length) .. s.length];
>   }
> }

Oh, forgot to mention: the initial/short path should only check for 
ASCII, i.e. c < 0x80. -- Andrei