[Haskell-cafe] Re: Editorial error or something meaningful?

Jon Fairbairn jon.fairbairn at cl.cam.ac.uk
Sat Dec 1 05:34:48 EST 2007

PR Stanley <prstanley at ntlworld.com> writes:

> Hi
> taken from ch.8.3 in the Hutton book:
> "Whereas return v always succeeds, the dual parser failure
> always fails regardless of the contents of the input
> string:"
> The dual parser failure?

It's a question of how you parse the phrase "dual parser
failure".  The name of the parser is "failure" and it is the
dual (roughly meaning "opposite") of the parser "return".

Jón Fairbairn                                 Jon.Fairbairn at cl.cam.ac.uk

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