Compile time digest error

[tcak via Digitalmars-d-learn]

[code]
private static import std.digest.md;

public enum HashValue = std.digest.digest.digest!( 
std.digest.md.MD5)( "" );

void main(){}
[/code]

[output]
dmd main.d
/usr/include/dmd/phobos/std/digest/md.d(202): Error: 
reinterpreting cast from uint[16] to ubyte* is not supported in 
CTFE
/usr/include/dmd/phobos/std/digest/md.d(320):        called from 
here: this.transform(&this._buffer)
/usr/include/dmd/phobos/std/digest/md.d(381):        called from 
here: this.put(cast(const(ubyte)[])bits)
/usr/include/dmd/phobos/std/digest/digest.d(458):        called 
from here: hash.finish()
main.d(3):        called from here: digest("")
[/output]


I would expect MD5 to work on compile time, but as the error 
indicates, the uint[16] to ubyte* conversion prevents that. I 
tried with "std.digest.md.md5Of" as well, and same result. Is 
there any MD5 function that returns a fixed length array like 
ubyte[16] maybe?