[Issue 19731] auto struct methods whose address is taken don't test invariants

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19731

--- Comment #9 from Dlang Bot <dlang-bot at dlang.rocks> ---
@ibuclaw created dlang/dmd pull request #12783 "Revert "Fix Issue 19731 - auto
struct methods whose address is taken don't test invariants"" mentioning this
issue:

- Revert "Fix Issue 19731 - auto struct methods whose address is taken don't
test invariants"

  This reverts commit 3f52528e2dd40f116202dac1a8e4d34326c5bc3b.

- test: Add regression tests to prevent breakages from fixing issue 19731

https://github.com/dlang/dmd/pull/12783

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