I've found what I believe to be a pretty serious bug in DMD (I've tried
it with DMD 2.031):
enum real ONE = 1.0;
for (real x=0.0; x<=10.0; x+=ONE) writeln(x);
The above loops only once, printing "0". And it gets weirder: Replace
real by double, and the program starts a near-infinite loop, spitting
out values on the order of 1e-312. Using float gives the same result as
real.
Removing "enum" from the declaration of ONE makes the program behave as
expected, as does writing "x+=1.0" in the for loop. The following works,
which means it's probably not an issue with the += operator in general:
enum real ONE = 1.0;
real x = 1.0;
x += ONE;
assert (x == 2.0);
I can't seem to find an existing report on this issue in Bugzilla, but I
find it hard to believe this hasn't been noticed before. That's why I
thought I'd bring it up here before writing a bug report.
-Lars
