Is this a bug, if so, how would you summarize it?

[safety0ff]

See this code: http://dpaste.dzfl.pl/b3ae1667

On DMD it gives the error message if version=bug, but not if 
version=bug AND version=workaround1 (through 6).
On LDC it segfaults at run time if version=bug, but not if 
version=bug AND version=workaround1 (through 6).

Workaround1 - workaround4 are more or less boring.
However it is surprising that workaround5 and workaround6 work 
but in the bug (when there's two aliases) you then get an error 
message for each alias.