# [Haskell-cafe] Re: QuickCheck: Arbitrary for a complex type

Joel Reymont joelr1 at gmail.com
Wed Apr 4 17:59:45 EDT 2007

One last bit then...

My identifiers should start with letter <|> char '_' and the tail
should be alphaNum <|> char '_'.

I guess I can use choose and oneof to produce the right set of
characters but how do I combine  the two into a single identifier of
a given length (up to 20 chars, say)?

Thanks, Joel

On Apr 4, 2007, at 5:27 PM, Fawzi Mohamed wrote:

> Great, just one thing that could be important : when you have
> recursive structures (like your Statement through Compound) be sure
> to use
> sized (\mySize -> ...)
> as generator for arbitrary so that you can avoid infinite looping.

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