CodeQL library for Python
codeql/python-all 2.2.0 (changelog, source)
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Predicate SsaComputeImpl::EssaDefinitionsImpl::piNode

Holds if def is a pi-node for v on the edge pred -> succ

Import path

import semmle.python.essa.SsaCompute
predicate piNode(SsaSourceVariable v, BasicBlock pred, BasicBlock succ)