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In the previous design of output(), you could get into a situation where the outputs for the test depended on which output path the test took, meaning that if an error occured, it would generate an error golden, but once the error was resolved, it would fail to delete the error golden. This change requires that all outputs be specified up-front.
Rust does not provide a way to specify that there are non-Rust files relevant to the build that should cause the build to stale if they change. We implement this ourselves through some gross mtime hacks. The best we can do is inform the user that inputs have changed and they must re-run cargo test to cause the tests to be rebuilt against the new inputs.
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