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bug#21829: guix import hackage failures

From: Federico Beffa
Subject: bug#21829: guix import hackage failures
Date: Thu, 26 Nov 2015 09:28:07 +0100

On Wed, Nov 25, 2015 at 10:45 PM, Ludovic Courtès <address@hidden> wrote:
> Federico Beffa <address@hidden> skribis:


>>>> +      ;; indentation based block recognition.
>>>> +      (begin (unread-char #\newline port) (read-char port) 0)
>>> Isn’t this equivalent to: 0 ?
>> No. This is because at the start of a new line we check if and how
>> many indentation blocks have ended. If the last line doesn't terminate
>> this check is no done.
> More generally, it looks like:
>   (begin (do-effect!) (undo-effect!) val)
> which I thought reduces to:
>   val

Since we are doing IO, there are side effects. The key difference is
the result of '(port-column port)' and that triggers what I mentioned.

Thanks for the review.

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