[Haskell-cafe] Rebindable 'let' for observable sharing?

[Henning Thielemann]

Now that almost every syntax can be redirected to custom functions
(RebindableSyntax, OverloadedStrings), would it make sense to map 'let'
to 'fix' ? Would this open a way to implement observable sharing as
needed in EDSLs by a custom 'fix'?