We Cannot 100% Trust AI-Generated Output: A Concrete Example
The article describes a concrete example where an AI tool, Claude, incorrectly identified a bug in a C++ Windows Registry library. The author tested the claim and found that the Windows API guarantees null‑termination, so the reported issue does not occur in practice. The incident illustrates that AI‑generated code suggestions should be verified before reliance.
- ▪Claude reported that zero‑length REG_SZ and REG_EXPAND_SZ values would cause a crash in the library’s string getters.
- ▪Testing showed that RegGetValueW guarantees a null‑terminated string, preventing the alleged zero‑length condition from being hit.
- ▪After the author’s feedback, Claude acknowledged the mistake and corrected its analysis.
- ▪The episode underscores the need to double‑check AI‑generated code because tools can contain errors or incorrect assumptions.
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| Original publisher | Giovanni Dicanio's Blog |
| Canonical URL | https://giodicanio.com/2026/07/28/why-we-should-double-check-the-ai-output-a-bug-which-wasnt/ |
| Publication time | Tue, 28 Jul 2026 16:42:57 +0000 |
| Retrieval time | 2026-07-28T17:10:36.902Z |
| Last seen | 2026-07-28T17:10:36.902Z |
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Opening excerpt (first ~120 words) tap to expand
Why We Should Double-Check the AI Output: A Bug Which Wasn’t This is a concrete real-world example showing how AI-generated results should not be 100% completely trusted. Recently I asked Claude to review the code of my WinReg C++ library (which is a C++ high-level wrapper around the low-level C-interface Windows Registry API). As a result of its analysis, Claude reported that there were zero-length bugs in my code, in particular Claude stated that zero-length REG_SZ/REG_EXPAND_SZ values crash the GetStringValue, GetExpandStringValue, TryGetStringValue and TryGetExpandStringValue methods of the RegKey class.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at Giovanni Dicanio's Blog.
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