updated comments.

tests/test020.js

@@ -1,4 +1,23 @@
 // Test reported by sterowang, Variable attribute defines conflict with function.
+/*
+What steps will reproduce the problem?
+1. function a (){};
+2. b = {};
+3. b.a = {};
+4. a();
+
+What is the expected output? What do you see instead?
+Function "a" should be called. But the error message "Error Expecting 'a' 
+to be a function at (line: 1, col: 1)" received.
+
+What version of the product are you using? On what operating system?
+Version 1.6 is used on Cent OS 5.4
+
+
+Please provide any additional information below.
+When using dump() to show symbols, found the function "a" is reassigned to 
+"{}" by "b.a = {};" call.
+*/
 
 function a (){};
 b = {};