https://issues.dlang.org/show_bug.cgi?id=13743

          Issue ID: 13743
           Summary: floating point inconsistent division by zero
           Product: D
           Version: D1 & D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: minor
          Priority: P1
         Component: DMD
          Assignee: nobody@puremagic.com
          Reporter: public@dicebot.lv

```
void main()
{
    real x = 1;
    real y = x / 0;
    assert(y is real.infinity);
}
```

This passes when compiled without optimizations and fails when compiled with -O. When optimizations are enabled y is evaluated as NaN (probaby because of const-folding?)

I don't know if this is bug or feature and if it should be fixed / changed at all but creating bugzilla issue just so that it won't be as much of surprise to others :)

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