Re: [Haskell-cafe] Will changing associativity of enumerator's ($=) affect anyone? (also: enumerator mailing list)

As a recent newbie, I would like to confirm the parent's report. I eventually managed to think of the parentheses, but it did leave me stumped for a while on thursday. On Sa, 2011-10-15 at 12:49 -0400, David McBride wrote:

This would be a big boon to newbies. When I first started using the library I would get big errors using $= that were because I didn't have parenthesis I needed, but didn't realize I needed, despite the fact that the types seemed to line up.

On Sat, Oct 15, 2011 at 12:40 PM, Michael Snoyman wrote:

...

On Sat, Oct 15, 2011 at 4:59 PM, John Millikin wrote:

...

A user recently suggested changing the associativity of ($=) from [[ infixr 0 ]] to [[ infixl 1 ]]. This allows the following expressions to be equivalent:

run $ enumerator $$ enumeratee =$ enumeratee =$ iteratee run $ enumerator $= enumeratee $$ enumeratee =$ iteratee run $ enumerator $= enumeratee $= enumeratee $$ iteratee

Although this is technically a backward-incompatible change, I feel it's small enough that it could go in a minor release *if nobody depends on the current behavior*.

So, if anybody using 'enumerator' will have code broken by this change, please speak up. If I don't hear anything in a week or so, I'll assume it's all clear and will cut the new release.

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Second, I was asked whether there's a mailing list for enumerator stuff. To my knowledge there isn't, so I started one on librelist. To subscribe and/or post, send an email to haskell.enumerator@librelist.com . Archives are available at http://librelist.com/browser/haskell.enumerator/ . I plan to make release announcements there (for releases not important enough for haskell-cafe), and it might be useful for general discussion.

I'm strongly in favor of this change, the current associativity has caused me to litter some code with a few too many parentheses.

Michael

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