[Haskell-cafe] Why?

Jason Dusek jason.dusek at gmail.com
Fri Dec 11 18:55:16 EST 2009

2009/12/10 Luke Palmer <lrpalmer at gmail.com>:
> I always meet with armies of resistance when I say this...

  The troops arrive.

> ...but unsafePerformIO should die a horrible, unforgiven
> death. "Well what if you want blah blah blah with a pure
> interface?" My response: too fscking bad!

  Wouldn't removing `unsafePerformIO` just force us, in many
  cases, to write the same thing in C and then import it? Or
  would you amend the FFI so "math.h sin" could not be imported

  There are plenty of bad ways to use `unsafePerformIO`, this is
  true; but as we already have a tool for binding to native code
  in a way that trusts it to be pure, I don't see how having a
  way to bind to nominally side-effecting Haskell code in a way
  that trusts it to be pure adds anything to our troubles.

Jason Dusek

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