[Issue 20802] [REG2.088.0] Link failure with writefln

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20802

Richard Cattermole <alphaglosined at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |alphaglosined at gmail.com

--- Comment #2 from Richard Cattermole <alphaglosined at gmail.com> ---
Another more slimmed down version that was experienced by someone on the N.G.

```d
import std.uni, std.stdio;

void main() {
     auto c1 = CodepointSet('a','z'+1);
     writefln("%s", c1);
}
```

```
/dlang/dmd/linux/bin64/../../src/druntime/import/core/internal/switch_.d:189:
error: undefined reference to
'_D4core9exception__T15__switch_errorTZQsFNaNbNiNeAyamZv'
```

https://forum.dlang.org/post/nvjgpznfizkishhubcuz@forum.dlang.org

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