public ReadOnlyCollection<Expression> Reads(Node atom)
{
return _usages[atom.AssertCast<Expression>()].Where(u => !(u is Assign)).ToReadOnly();
}
public ReadOnlyCollection<Assign> Writes(Node atom)
{
return _usages[atom.AssertCast<Expression>()].OfType<Assign>().ToReadOnly();
}
public ReadOnlyCollection<Expression> Usages(Node atom)
{
return _usages[atom.AssertCast<Expression>()].ToReadOnly();
}