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

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: http://www.reddit.com/r/haskell/comments/1luan1/strange_io_sequence_behaviou...