John Meacham wrote:
I was wondering if we could be sure to get
dependingOn :: a -> b -> a
dependingOn = ....
in ghc 6.6? this has been discussed before, it is implemented in jhc and
I have found all sorts of use for it as it can be used to control let
floating and inlining in a nice general way and is trivial to implement.
(one for ghc was posted before based on primitives it already
implements)
we just need to decide on a module to export it.
the meaning is that
x = ... `dependingOn` y
returns x with an artificial dependency on y. so things using x cannot
be floated out above where y is defined.
If you make a ticket for it, we can try to get to it for 6.6, but it's probably
unlikely at this stage.
It's like the touch# primitive we already have, but I'm not sure if it can be
implemented using touch#. We did discuss this before, IIRC - do you have a
pointer to the discussion?
Cheers,
Simon
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