Why is catching an exception non-pure, but throwing an exception is pure?

Asked 2012-09-08T23:17:12.123

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In Haskell, you can throw an exception from purely functional code, but you can only catch in IO code.

Why?
Can you catch in other contexts or only the IO monad?
How do other purely functional languages handle it?

haskell exception functional-programming purely-functional

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