-** All rights reserved.
-**
-** Author: Goetz Lindenmaier
-**
-** traverse the type information. The walker walks the whole ir graph
-** to find the distinct type trees in the type graph forest.
-** - execute the pre function before recursion
-** - execute the post function after recursion
+* All rights reserved.
+*
+* Author: Goetz Lindenmaier
+*
+* traverse the type information. The walker walks the whole ir graph
+* to find the distinct type trees in the type graph forest.
+* - execute the pre function before recursion
+* - execute the post function after recursion