CodeQL library for C#
codeql/csharp-all 1.0.3-dev (changelog, source)
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Predicate SourceVariableImpl::outRefExitRead

Holds if a pseudo read for ref or out variable v happens at index i in basic block bb. A pseudo read is inserted to make assignments to out/ref variables live, for example line 1 in

void M(out int i) {
  i = 0;
}

Import path

import semmle.code.csharp.dataflow.internal.SsaImpl
predicate outRefExitRead(BasicBlock bb, int i, LocalScopeSourceVariable v)