Names with trailing question mark

[Christophe]

I don't really like this idea. D has limitations to accepted symbol that 
are strict, but handy in many cases. Accepting strange character in a 
method name can lead to parsing ambiguities and I like the way D enforce 
non-ambiguous code. I understand why we can think that the question mark 
is nicer than an auxilliary in this case, but where to draw the line? 
The question mark already lead to a (small) parsing ambiguity.