Fixed 5/5 unseen bugs with one example: generative router in action
No-Program-5087 · reddit · 2026-08-23
The author presents "fluid-router," a program synthesis repair tool that infers repair logic from a single worked example (e.g., "fault kind 0 is repaired by act 5"). The generated 4 ARM64 instructions achieved perfect generalization, fixing 5/5 unseen bugs exactly.
Key Takeaways:
- Performance: Repaired idioms from funcy and other libraries with byte-identical accuracy in 10.3s.
- Critical Insight: Without a timeout, the pipeline hung for 595s due to a non-terminating candidate. A 5-second bound fixed this.
Limitations:
- Covers 63% of live mutants (boolean swaps are un-routable).
- Cannot recover arbitrary permutations from one example.
- Bottleneck: Routing takes 656ns, but candidate verification takes 28.6ms.
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