I am proposing something a bit more ambitious than what I need, because the proposal as written seems more likely to be broadly useful.  The bit that I actually need is about desugaring of infix operators in the presence of RebindableSyntax.  I'd love to get early thoughts from anyone who has a solid use case for the rest of the proposal.  It feels like a thing that *ought* to be useful, but I'm drawing blanks at the moment.