[Issue 19878] Some NaNs are printed as -nan

[d-bugmail at puremagic.com]

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

Vladimir Panteleev <dlang-bugzilla at thecybershadow.net> changed:

           What    |Removed                     |Added
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                 CC|                            |dlang-bugzilla at thecybershad
                   |                            |ow.net

--- Comment #2 from Vladimir Panteleev <dlang-bugzilla at thecybershadow.net> ---
////////// test.c //////////
#include <stdio.h>

union X { int x; float y; };

int main()
{
    union X x;
    x.x = -1;
    printf("%f\n", x.y);
    return 0;
}
////////////////////////////

This also prints -nan.

What's the bug?

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