fix import to refer to compiler package
diff --git a/Lib/compiler/visitor.py b/Lib/compiler/visitor.py
index 5bdf108..7392662 100644
--- a/Lib/compiler/visitor.py
+++ b/Lib/compiler/visitor.py
@@ -1,4 +1,4 @@
-from tools import ast
+from compiler import ast
 
 class ASTVisitor:
     """Performs a depth-first walk of the AST