[Haskell-beginners] general structuring of "foreach" logic in IO

[John M. Dlugosz]

On 4/14/2014 10:47 AM, Brandon Allbery wrote:
>
>
> But it is the *compiler's* problem. "Constant" means "known at compile time" to the compiler.
>

Pure means pure at run-time over the life of the executable.  Just because the compiler 
doesn't know what it is (had it cared to evaluate it at compile time) doesn't mean it's 
not pure.

> Although I wonder if you'd be happier with getArgs >>= mapM_ (do ...).

That's what I ended up with when I stopped fiddling with that particular line.