In favour.

Simon: I don't think your objection pertains to this particular proposal amendment, does it? Rather it's a further change to the original proposal that you'd like to see.

On Mon, 11 Mar 2024 at 11:48, Simon Peyton Jones <simon.peytonjones@gmail.com> wrote:

Thanks Matthias

I'm generally supportive, but please see my comment exploring a minor alternative.

Simon

On Sat, 9 Mar 2024 at 00:12, Matthías Páll Gissurarson <mpg@mpg.is> wrote:

Greetings committee!

In [proposal #638](https://github.com/ghc-proposals/ghc-proposals/pull/638),
@int-index proposes that we introduce a prefix form of MkSolo#, and apparent oversight in proposal #475 [Non-punning list and tuple syntax](https://github.com/ghc-proposals/ghc-proposals/pull/475). 

Previously, you would write `(# a #)` to construct a `Solo# a`.
But the question is: what would be the prefix form of this constructor?
It can't be `(# #)`, because this is already defined as a constructor of `Unit#`!

This amendment proposes the `MkSolo#` constructor, having us write `MkSolo# a` for the prefix form. The discussion seems unanimous, after care was taken to clarify that a fully applied `MkSolo# a` would still be pretty printed as `(# a #)`, avoiding programmer confusion.

It seems quite straightforward to me, so:

I recommend accepting this amendment to #475.

--

--  Matthías Páll Gissurarson

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