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Position different in 5.0 and 5.1?


I've recently upgraded from 5.1 from 5.0 and have found that some of my old 
notebooks don't seem to work. I think I have the essence of what I'm utterly 
confussed about in this example:
Position[{"asd", "dsa"}, x_ /; (StringTake[x, 1] == "a")]

What I want is the position of list entries which have first character "a". 
In 5.0, this line works. In 5.1, I get an error that StringTake is being fed 
a string.

I can't find any documentation that explains what has changed to have this 
effect. I'm sure I've missed something obvious, but if anyone can explain to 
me what has changed, it would be very helpful indeed. I know I can do 
everything some other way, but I need to know exactly what old stuff I need 
to change!



Thanks



Julia Gog



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