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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.
+#
+
+# Type information generator. It transforms types into the AST of walker
+# procs. This is used by the code generators.
+
+import 
+  ast, astalgo, strutils, nhashes, trees, treetab, platform, magicsys, options, 
+  msgs, crc, idents, lists, types, rnimsyn
+
+proc gcWalker*(t: PType): PNode
+proc initWalker*(t: PType): PNode
+proc asgnWalker*(t: PType): PNode
+proc reprWalker*(t: PType): PNode
+# implementation
+
+proc gcWalker(t: PType): PNode = 
+  nil
+
+proc initWalker(t: PType): PNode = 
+  nil
+
+proc asgnWalker(t: PType): PNode = 
+  nil
+
+proc reprWalker(t: PType): PNode = 
+  nil