On Sun, 2009-07-26 at 02:34 +0100, Ian Lynagh wrote:
Hi all,
I've made a ticket and proposal page for making the labelled field syntax stricter, e.g. making this illegal:
data A = A {x :: Int}
y :: Maybe A y = Just A {x = 5}
and requiring this instead:
data A = A {x :: Int}
y :: Maybe A y = Just (A {x = 5})
I think I don't like it. It makes the "labelled function argument" trick much less nice syntactically. ... <- createProcess proc { cwd = Just "blah" } This is especially so if the labelled function argument is not the final parameter since then one cannot use $, you'd have to put the whole thing in ()'s. The labelled argument technique is one I think we should be making greater use of (eg look at the proliferation of openFile variants) so I don't think we should be changing the syntax to make it harder / uglier. Duncan