std::set<ProgramSyntax::Node *> unused_nodes;
std::map<ProgramSyntax::VariableDeclaration *, ProgramSyntax::Node *> assignments;
bool assignment;
std::set<ProgramSyntax::Node *> unused_nodes;
std::map<ProgramSyntax::VariableDeclaration *, ProgramSyntax::Node *> assignments;
bool assignment;