printStackTrace in doassert in JS land

shell/mongo_vstudio.cpp

@@ -21,11 +21,20 @@ const StringData _jscode_raw_utils =
 "return false;\n" 
 "}\n" 
 "\n" 
+"printStackTrace = function(){\n" 
+"try{\n" 
+"throw new Error(\"Printing Stack Trace (lines are 0-based in spidermonkey)\");\n" 
+"} catch (e) {\n" 
+"print(e.stack);\n" 
+"}\n" 
+"}\n" 
+"\n" 
 "doassert = function (msg) {\n" 
 "if (msg.indexOf(\"assert\") == 0)\n" 
 "print(msg);\n" 
 "else\n" 
 "print(\"assert: \" + msg);\n" 
+"printStackTrace();\n" 
 "throw msg;\n" 
 "}\n" 
 "\n"