[Issue 19878] New: Some NaNs are printed as -nan

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19878

          Issue ID: 19878
           Summary: Some NaNs are printed as -nan
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: andrei at erdani.com

Test code:

void main() {
    import std.stdio;
    union X { int x; float y; }
    X x;
    x.x = -1;
    writeln(x.y);
}

This should print "nan" but prints "-nan".

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