// this ctor overload is to be exclusively used by DU
// for creating a LocationEnvironment for "noSymbols" ActivityInstance
internal LocationEnvironment(LocationEnvironment parent, int capacity)
: this(null, null, parent, capacity)
{
}
// this ctor overload is to be exclusively used by DU
// for creating a LocationEnvironment for "noSymbols" ActivityInstance
internal LocationEnvironment(LocationEnvironment parent, int capacity)
: this(null, null, parent, capacity)
{
}