diff --git a/Lib/codeop.py b/Lib/codeop.py
index fc7e1e7..082285f 100644
--- a/Lib/codeop.py
+++ b/Lib/codeop.py
@@ -93,10 +93,13 @@
     except SyntaxError as e:
         err2 = e
 
-    if code:
-        return code
-    if not code1 and repr(err1) == repr(err2):
-        raise err1
+    try:
+        if code:
+            return code
+        if not code1 and repr(err1) == repr(err2):
+            raise err1
+    finally:
+        err1 = err2 = None
 
 def _compile(source, filename, symbol):
     return compile(source, filename, symbol, PyCF_DONT_IMPLY_DEDENT)