CodeQL library for C#
codeql/csharp-all 3.1.2-dev (changelog, source)
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Predicate signature InputSig::allowParameterReturnInSelf

Holds if flow is allowed to pass from parameter p and back to itself as a side-effect, resulting in a summary from p to itself.

One example would be to allow flow like p.foo = p.bar;, which is disallowed by default as a heuristic.

signature predicate allowParameterReturnInSelf(ParameterNode p)