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When Snapshots Leak: Metamorphic Grading for AI C++ Patches

This story is from 2026-09-20. It is preserved in the archive; the latest stories are on the live feed.

A C++ maintainer shipped an AI-authored merge_intervals patch on a Friday. Every golden file matched, and the CI badge stayed green. On Monday a caller passed the same ranges in a different order and the function returned overlapping pairs. The snapshots had all been pre-sorted. The model had learn…

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  1. 2026-09-20 11:09 · DEV Community — AI
    When Snapshots Leak: Metamorphic Grading for AI C++ Patches

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