text/template: add an unexported method to Node Protects the package a little against undesirable clients.
text/template: add an unexported method to Node
Protects the package a little against undesirable clients.

R=golang-dev, bradfitz, rsc
CC=golang-dev
http://codereview.appspot.com/6624054

h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang