Though it's clearly defined in the docs when to use NSMubleAnything vs. 
NSAnything (insert Array, Dictionary, String, etc for Anything), there is no 
compiler warning when you perform a simple action such as allocate a string and 
then reassign values to it.

With this in mind, what exactly constitutes a mutable action?

If we take this:

NSString *myString;
myString = @"Hi";
myString = @"Hi there";

I'm clearly expecting some type of warning from the compiler when myString is 
redefined, but I don't see one in Xcode 4.6.1.  Is this redefinition not a 
mutable action?  It sure seems like it is.

Thanks in advance.
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