Visit each Initializer in init. Call a function visit%s(init) for
each node, where %s is the op of the node. Otherwise call visitDefault(init)
for that node. If the visit function returns R.init, continue
visiting each node, otherwise return the value of R.
Visit each Initializer in init. Call a function visit%s(init) for each node, where %s is the op of the node. Otherwise call visitDefault(init) for that node. If the visit function returns R.init, continue visiting each node, otherwise return the value of R.