Path of activations from the current
list.
Dispatch enter and leave events for InstanceVariableReadNode
nodes and continue walking the tree.
Compile a ConstantOrWriteNode
node
Foo ||= bar
becomes
defined?(Foo) ? Foo : Foo = bar
Dispatch enter and leave events for ConstantAndWriteNode
nodes and continue walking the tree.
Dispatch enter and leave events for ConstantOperatorWriteNode
nodes and continue walking the tree.