[Haskell-cafe] Safe way to parse arguments?

[Xiao-Yong Jin]

Don Stewart <dons at galois.com> writes:

> The main thing is to define a safe read. This will be in the base
> library soon,
>
>       maybeRead :: Read a => String -> Maybe a
>       maybeRead s = case reads s of
>           [(x, "")] -> Just x
>           _         -> Nothing
>
> Then you can pattern match on the failure case as Nothing.

When will it be in the base library?

X-Y
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