Josh Triplett schrieb:

Hello,

In experimenting with HList's very impressive extensible records, I discovered that the field access operators (#) and (.!.) have right associativity; this means I can't write (r # f1 # f2) to access field f2 of the record stored in field f1 of r. If (#) and (.!) had left-associativity instead, then I could write such nested record operations. As far as I can tell, the right-associative binding would only make sense if attempting to store field labels inside a record, which seems much more unlikely.

I wrote to the author of HList about this issue, and he agreed that this sounded reasonable, but he wanted me to confirm via haskell-cafe that nobody had code which relied on the existing behavior.

Reverse dependencies on Hackage may spot packages that use the '#' operator.