On Wednesday, July 01, 2009, at 12:26PM, "David Blanton" 
<aired...@tularosa.net> wrote:
>       m_sources = [volumes stringsByAppendingPaths:[defaultManager  
>directoryContentsAtPath:volumes]];
>
>       the warning comes at the above line

Look at the Objective-C type for m_sources, and look at the Objective-C type 
returned by stringsByAppendingPaths:.  You are assigning an NSArray to an 
NSMutableArray variable.  The other way around would be okay, because every 
NSMutableArray is also an NSArray.  But an NSArray is not necessarily an 
NSMutableArray.

--Andy


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