On 2/5/07, Ulf Norell
On Feb 3, 2007, at 6:35 AM, Douglas Philips wrote:
Well, if we're going to bring personal points of view in, it highly pisses me off that in a construct such as: ( expr , expr , expr , expr , expr , ) I have to be vigilant to remove that trailing comma when it is in _no way_ ambiguous.
How about instead writing
( expr , expr , expr , expr , expr )
The only extra work is when inserting an element at the beginning, but you have the same problem in your example.
That style would be slightly improved by allowing a _leading_ comma: [ , expr , expr , expr , expr , expr ] In the trailing comma style, it looks like: [ expr , expr , expr , expr , ] Both require a similar amount of extra space, but I've found the second useful in python lists that change a lot, so I assume I'd find similar use in Haskell lists. Of course, the layout proposal solves this problem too, but it feels like a larger change. Regarding tuples vs. lists, I care a lot less about tuples because rearranging them usually requires a type change in lots of places, so fixing a comma is the least of my worries. Jeffrey Yasskin