[Haskell-cafe] How can i safely change the value of specified key ?

zaxis z_axis at 163.com
Thu Oct 22 03:28:14 EDT 2009

aaa <- newIORef ([]::[(Int,Int)])
writeIORef aaa [(1,1),(2,2),(3,3)] 

then if i want to change aaa to [(1,1),(2,222),(3,3)] , what's the best way
re-write aaa is not permitted.

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