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GHC 0.29 supported an early DRAFT of the Haskell 1.3 monadic I/O
facilities. Inevitably, what Really Made It into 1.3 is not quite
what was in the draft.
What was called `handle' in the draft is now called `catch'.
The type of the function `fail' changed between draft and real-thing.
Old: `fail x'; new: `fail (userError x)'.
Also, what used to be `failWith x' is now just `fail x'.
All the system modules named `LibSomething' dropped the `Lib'.
So: `LibSystem' is now just `System'.
As of 2.09, GHC doesn't have `PrimIO', and all `_ccall_'s now return
type `IO a', where `a' is the return type of the `_ccall_' itself.
The `IOError' type is now abstract; you cannot see it's
constructors. 1.3 provides functions to query errors.
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