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Explain what type errors have to do with purity #65

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Explain what type errors have to do with purity #65

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Commits on Feb 15, 2015

  1. Explain what type errors have to do with purity 

    To someone who isn't yet familiar with Haskell's syntax, the string
concatenation example looks like the type error is that a string is
being concatenated with a function. Here is an example which better
explains how using an IO computation in a pure context can lead to a
type error.

As a bonus, the new text no longer claims that "you cannot mix and match
purity with impurity". It's not true: we can mix them, but the result
must be marked as impure.
    @gelisam
    gelisam committed Feb 15, 2015
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