Since I saw there wasn't one yet, I have taken the liberty of writing
a PKGBUILD for Hasklig and uploading it to the Arch AUR. Anyone
running Arch can now get Hasklig from the AUR package otf-hasklig.
On Thu, Apr 24, 2014 at 3:07 PM, Niklas Hambüchen
A smart, recently proposed alternative is using a font that does this automatically for you: https://github.com/i-tu/Hasklig
In my opinion, this gives you all benefits of unicode syntax without imposing the drawbacks on others, and you don't even have to set up a custom input method to conveniently type them in.
Quoting:
Some Haskell programmers have resorted to unicode symbols in code as a solution (⇒, ← etc.). This opens a whole new can of worms. In addition to encoding/compatibility problems and all the reasons it never worked out for APL, these symbols are one-character-wide and therefore eye-strainingly small.
Hasklig solves this problem the way typographers have always solved ill-fitting characters which co-occur often: ligatures. The underlying code stays the same — only the representation changes.