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39 lines
1.5 KiB
Markdown
39 lines
1.5 KiB
Markdown
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# Scenario: Optimization request for "rust" returns 400 error
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## Context
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A user reports that their optimization request fails immediately with a 400 error. The request payload is:
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```json
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{
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"source_code": "fn main() { println!(\"Hello, world!\"); }",
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"trace_id": "abc-123",
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"language": "rust",
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"n_candidates": 5
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}
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```
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The server log shows:
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```
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ERROR 2026-02-14 10:22:15 optimizer_router: Unhandled language dispatch for 'rust'
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```
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No candidates are returned. The response body is `{"message": "Internal server error"}`.
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## Task
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Diagnose why this optimization request fails. Walk through the relevant stages of the optimization pipeline to identify the root cause. Provide:
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1. The exact stage where the failure occurs.
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2. The file(s) responsible for the failure.
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3. An explanation of why "rust" causes the failure.
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4. The fix: what would need to change to either reject "rust" cleanly with a 400 validation error, or to support it as a new language.
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## Expected Outputs
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- Identification that the failure is at the **router dispatch** stage (Step 2 of the debug-optimization-failure workflow).
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- Reference to `core/shared/optimizer_router.py` as the file where dispatch happens.
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- Explanation that "rust" is not in the set of supported languages (`python`, `javascript`, `typescript`, `java`), so the router has no branch for it.
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- A recommendation to either add `"rust"` validation to `OptimizeSchema` in `core/shared/optimizer_models.py` so it rejects unsupported languages at Step 1, or to implement Rust support following the add-language-support workflow.
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