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

[d-bugmail at puremagic.com]

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

--- Comment #6 from anonymous4 <dfj1esp02 at sneakemail.com> ---
This looks like a rather fundamental collision between speculative
instantiation and conditional compilation. __switch_errorT can't be in druntime
unconditionally because its behavior changes depending on compilation options.

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