[Haskell-cafe] Strange IO sequence behaviour (Was: sequence causing stack overflow on pretty small lists)

Tom Ellis tom-lists-haskell-cafe-2013 at jaguarpaw.co.uk
Fri Sep 6 21:31:31 CEST 2013

On Wed, Sep 04, 2013 at 04:35:17PM +0100, Tom Ellis wrote:
> As an addendum to the recent discussion, can anyone explain why main crashes
> quickly with a stack overflow, whereas main' is happy to print "Hi" for ages
> (eventually crashing due to an out of memory condition)?
>     bignum = 100 * 1000 * 1000
>     main   = replicateM bignum (return ())
>     main'  = replicateM bignum (putStrLn "Hi")

FYI, rwbarton on Reddit produced a nice answer:


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