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

[d-bugmail at puremagic.com]

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

--- Comment #10 from Dlang Bot <dlang-bot at dlang.rocks> ---
dlang/dmd pull request #16276 "merge stable" was merged into master:

- 6a2fe78ba45b4fcd495f7ab340f784640b9daf01 by Tim Schendekehl:
  Fix Bugzilla 20802 - Link failure with writefln (#16200)

  The issue is caused by compiling druntime/phobos and the application
  with different flags. The template instance for __switch_errorT is not
  included in the build of druntime/phobos, because they are compiled
  with -release. DMD will also not include it in an application compiled
  without -release, because it assumes, that it is already in druntime.
  See comment https://issues.dlang.org/show_bug.cgi?id=20802#c3 by Spoov.

  The template instance for __switch_errorT is now always instantiated in
  druntime, so it is part of the ABI of druntime.

https://github.com/dlang/dmd/pull/16276

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