Rollup merge of #127319 - oli-obk:fail2taint, r=compiler-errors

Remove a use of `StructuredDiag`, which is incompatible with automatic error tainting and error translations

fixes #127219

I want to remove all of `StructuredDiag`, but it's a bit more involved as it is also used from the `ItemCtxt`, which doesn't support tainting yet.
tree: 52e66dfa3fecc71263735cce279addac60662f13
  1. .github/
  2. .reuse/
  3. compiler/
  4. library/
  5. LICENSES/
  6. src/
  7. tests/
  8. .clang-format
  9. .editorconfig
  10. .git-blame-ignore-revs
  11. .gitattributes
  12. .gitignore
  13. .gitmodules
  14. .ignore
  15. .mailmap
  16. Cargo.lock
  17. Cargo.toml
  18. CODE_OF_CONDUCT.md
  19. config.example.toml
  20. configure
  21. CONTRIBUTING.md
  22. COPYRIGHT
  23. INSTALL.md
  24. LICENSE-APACHE
  25. LICENSE-MIT
  26. README.md
  27. RELEASES.md
  28. rust-bors.toml
  29. rustfmt.toml
  30. triagebot.toml
  31. x
  32. x.ps1
  33. x.py
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