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Dialogue I/O

Dialogue-style I/O -- still the default for GHC -- is on its way out (see the stuff about "monadic I/O for Haskell 1.3"), so we probably won't fix these shortcomings.

Support for `Dialogue' I/O:
We do not yet support all `Requests', notably: `ReadBinFile', `WriteBinFile', `AppendBinFile', `StatusFile', `ReadBinChan', `AppendBinChan', `StatusChan', `SetEnv'. Also, we do not support the optional I/O `Requests'.
`AppendChan' and `ReadChan' requests:
The former only works for `stdout' and `stderr'; the latter only for `stdin'.
`Echo' request:
We don't do anything at all.


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