For a given thunk node, create a new scope and push it on the stack.
End current scope and pop it from the stack.
End current scope and pop it from the stack.
Pop new scope when thunk has been constructed.
Pop new scope when thunk has been constructed.
Push new scope when start constructing new thunk.
Stack is represented as simple list with th first element as a top of the stack.
optional top scope.
(Since version ) see corresponding Javadoc for more information.
The stack of nested thunks during graph construction.