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diff --git a/nim/optast.pas b/nim/optast.pas
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-//
-//
-//           The Nimrod Compiler
-//        (c) Copyright 2008 Andreas Rumpf
-//
-//    See the file "copying.txt", included in this
-//    distribution, for details about the copyright.
-//
-
-unit optast;
-
-// Optimizations that can be done by AST transformations. The code generators
-// should work without the optimizer. The optimizer does the following:
-
-// - cross-module constant merging
-// - cross-module generic merging
-// - lowers set operations to bit operations
-// - inlining of procs
-// - ``s == ""`` --> ``len(s) == 0``
-// - optimization of ``&`` string operator
-
-interface
-
-{$include 'config.inc'}
-
-uses
-  nsystem, ast, astalgo, strutils, hashes, trees, treetab, platform, magicsys,
-  options, msgs, crc, idents, lists, types, ropes, nmath, wordrecg, rnimsyn;
-  
-implementation
-
-
-end.
-