[ghc-steering-committee] #380 GHC2021: What's wrong with Functional dependencies

Spiwack, Arnaud arnaud.spiwack at tweag.io
Fri Dec 4 14:12:42 UTC 2020

On Fri, Dec 4, 2020 at 3:07 PM Simon Peyton Jones <simonpj at microsoft.com>

> But fundeps – because they don’t carry evidence, as they stand – feel less
> solidly rooted.

Can you elaborate? I don't understand where you are coming from yet.

(for the record: I'm not applying just “guarded by their own syntax” as a
criterion, for me, this criterion is a sufficient condition for “no
surprising new errors”. I also believe (believed?) that functional
dependencies were quite standard and expected them to be here forever. I
took TypeFamilyDependency to be a mild extension. I'm perfectly willing to
be convinced otherwise.)
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