https://issues.dlang.org/show_bug.cgi?id=20288

          Issue ID: 20288
           Summary: std.format double with NaN fails with range violation
                    on comma
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nobody@puremagic.com
          Reporter: rschadek@symmetryinvestments.com

```
void main(){
    import std.format;
    format("%,.2f", double.nan);
}
```

core.exception.RangeError@/dlang/dmd/linux/bin64/../../src/phobos/std/format.d(2659):
Range violation

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