[Issue 3190] New: enum doesn't work as the increment in a for loop

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=3190

           Summary: enum doesn't work as the increment in a for loop
           Product: D
           Version: 2.031
          Platform: x86_64
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: bugzilla at kyllingen.net


The following should print a list of numbers from 0 to 10:

    enum real ONE = 1.0;
    real x;
    for (x=0.0; x<10.0; x+=ONE)  writeln(x);
    writeln(x);

Instead it prints:

    0
    nan

I.e. the loop is only executed once, and x is set to NaN after the first
iteration. The same happens if float is used instead of real. If double is
used, the program goes into a near-infinite loop, spitting out very small
numbers (starting with 6.65345e-316).

The following makes the program behave as expected:
  - making ONE a normal variable instead of an enum
  - writing "enum { real ONE }" instead
  - putting the increment inside the loop body

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