# sink: An alternative to lazy I/O that doesn't conflate execution with evaluation

[ control, data, deprecated, library, mit, system ] [ Propose Tags ]
Deprecated.

Lazy I/O conflates evaluation with execution; a value obtained from unsafeInterleaveIO can perform side-effects during the evaluation of pure code. Like lazy I/O, a Sink provides a way to obtain the value of the result of an IO action before the action has been executed, but unlike lazy I/O, it does not enable pure code to perform side-effects. Instead, the value is explicitly assigned by a later IO action.

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