[Haskell-cafe] GHC Extension Proposal: ArgumentBlock

Oliver Charles ollie at ocharles.org.uk
Sun Sep 6 18:03:00 UTC 2015

I mean that people us $ for purely syntactical purposes. If an editor is
going to make refactorings and retain a certain sense of style, then the
tool needs to know that $ is sometimes to be used. The refactoring (or
otherwise) tool now has to be aware of the syntax of Haskell and special
symbols in the Prelude.

On Sun, Sep 6, 2015 at 6:53 PM Matthew Pickering <
matthewtpickering at gmail.com> wrote:

> >
> > I don't really like $ from an editor perspective though (tooling has to
> > become aware of a single function when performing refactorings), so
> anything
> > that helps reduce how prolific that operator is is a win in my book!
> >
> Can you please explain what you mean by this? Is there something more
> subtle that $ being a low fixity operator? Which specific problems
> does it cause tooling? Are you referring to the fact that there are
> problems because $ == id and makes tooling account for two cases when
> looking for refactorings? (I'm thinking of hlint here).
> (FWIW, haskell-src-exts tries to fiddle with the AST to account for
> fixity after parsing but the GHC parser does not, it happens during
> renaming. There is a pure version here[1] if anyone else is in need of
> this feature).
> Thanks, Matt
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