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This is fairly straightforward; the actual compiler changes are limited to the CLI, since `Compilation` already supports this combination. A new `std.Build` API is introduced to allow representing this. By passing the `emit_object` option to `std.Build.addTest`, you get a `Step.Compile` which emits an object file; you can then use that as you would any other object, such as either installing it for external use, or linking it into another step. A standalone test is added to cover the build system API. It builds a test into an object, and links it into a final executable, which it then runs. Using this build system mechanism prevents the build system from noticing that you're running a `zig test`, so the build runner and test runner do not communicate over stdio. However, that's okay, because the real-world use cases for this feature don't want to do that anyway! Resolves: #23374