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The autogenerated class with no source code was not a hypothetical example. This was something I saw cause a problem in production, where the source code in the stack trace didn't exist.

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code generation is a mostly disjoint topic from DI. Granted, some solutions like https://github.com/google/wire use code generation, but you're exactly right about their pitfalls. If your dev environment doesn't have good support for generated code, it is a nightmare. If you can goto-definition the generated code, then it is suddenly feasible, but perhaps still a bad choice.

But the DI frameworks I've used are typically just... normal code files. Uber/fx, Go/Guice, etc

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