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codewalker n.
 A program component that traverses other
   programs for a living.  Compilers have codewalkers in their front
   ends; so do cross-reference generators and some database front
   ends.  Other utility programs that try to do too much with source
   code may turn into codewalkers.  As in "This new vgrind
   feature would require a codewalker to implement."
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