Hi all, A few days ago I made a post here to gauge interest in adding idiom brackets to GHC. Response was a bit more mixed than I was hoping, but no one seemed to drastically against the idea, so I've moved forward with a more detailed proposal. You can find the full proposal here: https://ocharles.org.uk/IdiomBrackets.html A particular difference in my proposal from existing solutions comes from my desire to lift almost *all* expressions - with the original syntax - into idiom brackets. This means normal function application and tuples, but also case expressions, let bindings, record construction, record update, infix notation, and so on. At first I was skeptical about this, but I am finding uses for this more and more. I really like how it lets me use the interesting data (that is, whatever is "under" the applicative functor) where it's most relevant - rather than having to build a function and thread that value back through. Examples of this can be seen in my proposal. To prove its use, I've been working with this Template Haskell expression: https://ocharles.org.uk/IdiomExp.hs It *almost* does exactly what I want, the only problem is I can't get Template Haskell to give me a difference between $(i [| const True False |]) and $(i [| (const True) False |]) which I was planning to be significant. The proposal has mostly grown into my own personal notebook, so I'm happy to clarify anything that is vague/contradictory/confusing. Look forward to hearing your thoughts! -- Ollie