patch applied (haskell-prime-status): add ""Make $ left
associative, like application"
marlowsd at gmail.com
Wed Apr 23 12:52:11 EDT 2008
Duncan Coutts wrote:
> On Tue, 2008-04-22 at 21:02 -0400, Dan Doel wrote:
>> 3) Left associative ($) is consistent with left associative ($!). The right
>> associative version of the latter is inconvenient, because it only allows
>> things to be (easily) strictly applied to the last argument of a function.
> What about having ! as a left associative strict apply operator?
> f !x !y !z
> Isn't there already a proposal along these lines? There is certainly a
> proposal to stop using ! for array indexing.
The problem with this is that
f !x y
would associate differently in an expression than it does on the left
hand side of an equation, where ! is the prefix bang-pattern operator.
To make this consistent we'd have to make ! a prefix operator in
expressions, or give it the same precedence as function application;
both mean a new extension.
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