Point CARGO_MANIFEST_DIR to transformed sources dir#4154
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Crates with generated inputs have their source files and compile data staged under bazel-out so rustc can resolve modules from one root. The compile action still points `CARGO_MANIFEST_DIR` at the source package, which is absent from the sandbox and breaks proc macros that read files relative to the manifest. Assisted-by: GPT-5.6 Sol
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Crates with generated inputs have their source files and compile data staged under bazel-out so rustc can resolve modules from one root. The compile action still points
CARGO_MANIFEST_DIRat the source package, which is absent from the sandbox and breaks proc macros that read files relative to the manifest.Assisted-by: GPT-5.6 Sol