CXXDefaultInitExpr
The CFG doesn't contain a CFGElement for the `CXXDefaultInitExpr::getInit()`, so it makes sense to consider the `CXXDefaultInitExpr` to be the expression that originally constructs the object.
Environment::get<>()
AggregateStorageLocation
RecordStorageLocation
StructValue
RecordValue
Formula::isLiteral()
Value