[Haskell-cafe] Optional "Default" instances of classes in certain subcases (but too broad)

Juan Casanova juan.casanova at ed.ac.uk
Mon Oct 14 18:39:02 UTC 2019

Correction to my last email:

-- The following would not work because there is no instance Class1  
deriving via (NT2) instance Class1 NT1 NT1 Int

-- But this would work
deriving via (NT2) instance Class1 NT1 NT2 Int

The University of Edinburgh is a charitable body, registered in
Scotland, with registration number SC005336.

More information about the Haskell-Cafe mailing list