I agree, I am also surprised that 2.066 was released despite
There is an apparently endless stream of regressions, I have
found another today
(https://issues.dlang.org/show_bug.cgi?id=13321 ). I think D is
not yet at the stage of its development where it can hope to fix
all the regressions. So if you try to wait for all regressions to
be fixed, you never ship a compiler version, and this has serious
disadvantages. So better to be a little more practical for now.
2.066 has took ages to come out, it was overdue. I hope 2.067
will come out much quicker.