[Issue 21648] Speculative recursive reference to struct with semantic error prints "error: unknown": Part 2

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21648

--- Comment #5 from Dlang Bot <dlang-bot at dlang.rocks> ---
dlang/dmd pull request #12213 "Revert "Fix issue 21648: remove two lines from
dsymbolsem.d."" was merged into master:

- bed1af60a9e3bc7ba089239b52dcfe8a7b70e8e1 by Walter Bright:
  Revert "Fix issue 21648: remove two lines from dsymbolsem.d. I don't know
what they do but it fixes the bug. And doesn't break the testsuite, so
¯\_(ツ)_/¯"

  This reverts commit 1ed39162b0e82663d35c731d7437eeb8eadc9431.

https://github.com/dlang/dmd/pull/12213

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