[pct]: * Instead of repeatedly scanning outer blocks' symbol tables for   'scope' attributes, we now keep a running symbol table that   collects all of the symbols into a single %symtable hash for easy   lookup.
[pct]:
* Instead of repeatedly scanning outer blocks' symbol tables for
  'scope' attributes, we now keep a running symbol table that
  collects all of the symbols into a single %symtable hash for easy
  lookup.


git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@26895 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

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