Error found:
in module Main
at tests/purs/failing/Superclasses1.purs:12:1 - 13:17 (line 12, column 1 - line 13, column 17)

  No type class instance was found for
                  
    Main.Su Number
                  

while checking that expression #dict Su
  has type Su$Dict t0
in value declaration clNumber

where t0 is an unknown type

See https://github.com/purescript/documentation/blob/master/errors/NoInstanceFound.md for more information,
or to contribute content related to this error.