On 10/06/2011 12:28 PM, Prabhakar Ragde wrote:
On 10/6/11 2:12 PM, Eli Barzilay wrote:
Sam is talking about building the ASTs *while* matching, which is what
Jay was trying to do with uses of `app'. I think that a teaching
context is in particular one where such a thing doesn't fit -- it
obscures the distinction between the side the sexpr goes into, and the
side where an AST comes out.
Okay, I see the distinction, and I apologize for not having fully
understood Jay's example. I agree that this obscurity is hazardous. I
think, though, that I have always assumed left-to-right matching, though
I may never have constructed anything that would break if it didn't
happen. --PR
I think most people expect branching constructs like 'match' to make
in-order (left-to-right/depth-first), short-cutting decisions.
Additionally, the cases themselves do this. So I think the fact that the
patterns don't is very surprising.
Neil T
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