[Haskell-cafe] How do I do conditional tail recursion in a monad?

[David F. Place]

On Mar 21, 2007, at 8:40 AM, Jules Bean wrote:

> Part of the reason is all the possible variations (monadic action,  
> monadic test, monadic filter, etc etc), and it's all really very  
> easy to write yourself.

Indeed, I had just written

whileM_ p a = do cond <- p ; if cond then do a ; whileM_ p a else  
return ()

I always wonder, when I have to do such things, if I just haven't  
studied the libraries well enough.

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David F. Place
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