tracker issue : CF-3341284

Problem Description:
We have a large base of code that used to work fine in CF8.0.1 and we are trying to upgrade to CF10.  Here is a simplified example that will work in a stand-alone CFM file (also attached as debug.cfm):

<cffunction name="innerTest" access="public" output="true" returntype="void">
	<cfset var ls = {} />
	
	<cfset ls.argsGood = StructCopy(arguments) />
	<cfset dummyTest(argumentcollection=arguments) />
	<cfset ls.argsBad = StructCopy(arguments) />
	<cfset ls.argsGood.d = arguments.c />
	<cfset ls.argsBad.d = arguments.c />
	
	<cfoutput>
	inner args: ls.argsGood.d = #ls.argsGood.d#
	<cfdump var="#ls.argsGood#"/>
	ls.argsBad.d = #ls.argsBad.d#
	<cfdump var="#ls.argsBad#"/>
	</cfoutput>
	
</cffunction>

<cffunction name="dummyTest" access="public" output="false" returntype="void">
</cffunction>

<cfset innerTest(a="1",b="2",c="3")/>

Steps to Reproduce:
Place debug.cfm anywhere under ColdFusion's web root and retrieve it from your browser.

Actual Result (in CF10):
inner args: ls.argsGood.d = 3
struct
D	 3
a	 1
b	 2
c	 3
ls.argsBad.d = 3
struct
a	 1
b	 2
c	 3

Expected Result (actual result in CF8):
inner args: ls.argsGood.d = 3
struct
D	 3
a	 1
b	 2
c	 3
ls.argsBad.d = 3
struct
D	 3
a	 1
b	 2
c	 3

Any Workarounds:
Rewrite hundreds of lines of our working CF8 code to avoid calling functions with argumentcollection=arguments before using StructCopy.

----------------------------- Additional Watson Details -----------------------------

Watson Bug ID:	3341284

Keywords:
FixTested


External Customer Info:
External Company:  
External Customer Name: Paul Karlin
External Customer Email:  
External Test Config: My Hardware and Environment details:

Windows 7 Enterprise or 2008R2 Web/Standard Edition, 64-bit CF10, 64-bit JDK1.6.0_31, connected via IIS

Attachments:

1. October 05, 2012 00:00:00: 1_debug.cfm

Comments: