CodeQL library for Swift
codeql/swift-all 2.0.2 (changelog, source)
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Predicate signature PathGraphSigMod::PathGraphSig::subpaths

Holds if (arg, par, ret, out) forms a subpath-tuple, that is, flow through a subpath between par and ret with the connecting edges arg -> par and ret -> out is summarized as the edge arg -> out.

signature predicate subpaths(PathNode arg, PathNode par, PathNode ret, PathNode out)