CodeQL library for Ruby
codeql/ruby-all 2.0.4-dev (changelog, source)
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Predicate signature InputSig::readStep

Holds if data can flow from node1 to node2 via a read of c. Thus, node1 references an object with a content c.getAReadContent() whose value ends up in node2.

signature predicate readStep(Node node1, ContentSet c, Node node2)