On 08-08-12 19:01, Simon Hengel wrote:

On Wed, Aug 08, 2012 at 12:22:39PM -0400, David Feuer wrote:

Changing scoping rules based on whether things are right next to each
other? No thanks.

Would expanding each let-less binding to a separate let "feel" more
sound to you?

That was actually my first idea, but then two declarations at the same level will not be in the same binding group, so

do x = y
y = 1

would not compile. This would create a difference with all the other places where bindings may appear.

However, having scope depend on things being next to each other (or rather, not having anything in between) is not new. Template Haskell declaration splices already cause separate binding groups for top-level declarations. Moreover, the new scope rule only holds for let-less bindings. If you use explicit lets nothing changes.

-- Martijn