126-Byte Python Snippet Crashes Five Major Type Checkers

charliermarsh · x · 2026-07-31

Developer charlielmash shared a mere 126-byte Python snippet that wreaks havoc across major static analysis tools. The code causes ty to stack-overflow, mypy to segfault, Pyright to time out, Pyrefly to panic, and Pycroscope to fail with an internal error.

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