Adding an ignore function to Control.Monad

[Sittampalam, Ganesh]

John Meacham wrote:

> 
> And here I always get annoyed by types that specify '()' explicitly
> when a universally quantified type will do. (`when` and `unless` are
> particularly offensive in this regard). Forcing idioms to be more
> verbose than necessary obscures intent.   
> 
> Do we have any data that accidentally ignoring return values is a
> problem in practice?

On the flip side, could you give some examples where ignoring return
values is useful and natural?

Cheers,

Ganesh

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