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acd4a1ccd2
Remove dead code and extend test coverage and diagnostics around it I was staring a bit at the `dont_niche_optimize_enum` variable and figured out that part of it is dead code (at least today it is). I changed the diagnostic and test around the code that makes that part dead code, so everything that makes removing that code sound is visible in this PR
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.