Re: [Haskell-cafe] ANNOUNCE: pipes-core 0.0.1

11 Mar 2012


      On 12-03-11 12:39 PM, Chris Smith wrote:
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(p1>>  unawait x)>>>  p2 = (p1>>>  p2)<* unawait x       -- this one
tripped me up
I don't think this could reasonably hold.  For example, you'd expect
On Sun, Mar 11, 2012 at 10:30 AM, Mario Blažević  wrote:
that for any p, idP>>  p == idP since idP never terminates at all.
But then let p1 == idP, and you get something silly.  The issue is
with early termination: if p2 terminates first in the left hand side,
you don't want the unawait to occur.
No, idP does terminate once it consumes its input. Your idP >> p 
first reproduces the complete input, and then runs p with empty input.