[Haskell-cafe] Inferred typing?

michael rice nowgate at yahoo.com
Tue May 12 14:08:11 EDT 2009

I was looking at some code and couldn't figure out how it was returning a list since there were no list constructors present.



--- On Tue, 5/12/09, Brent Yorgey <byorgey at seas.upenn.edu> wrote:

From: Brent Yorgey <byorgey at seas.upenn.edu>
Subject: Re: [Haskell-cafe] Inferred typing?
To: haskell-cafe at haskell.org
Date: Tuesday, May 12, 2009, 7:50 AM

On Mon, May 11, 2009 at 10:59:01PM -0700, michael rice wrote:
> In the code below, is the type returned by the return functions inferred from 
> the result type in the function type signature, i.e., just change the result
> type to Maybe Int and the code will return a Maybe monad, (Just 4), instead of
> a List monad?

Indeed, it is.  Try it! =)

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