Error found:
at tests/purs/failing/SelfCycleInTypeClassDeclaration.purs:4:1 - 4:23 (line 4, column 1 - line 4, column 23)

  A type class 'Foo' may not have itself as a superclass.


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